text: "use strict";
  
  var htmlNamespace = "http://www.w3.org/1999/xhtml";
  
  var cssStylingFlag = false;
  
  var defaultSingleLineContainerName = "p";
  
  // This is bad :(
  var globalRange = null;
  
  // Commands are stored in a dictionary where we call their actions and such
  var commands = {};
  
  ///////////////////////////////////////////////////////////////////////////////
  ////////////////////////////// Utility functions //////////////////////////////
  ///////////////////////////////////////////////////////////////////////////////
  //@{
  
  function nextNode(node) {
  	if (node.hasChildNodes()) {
  		return node.firstChild;
  	}
  	return nextNodeDescendants(node);
  }
  
  function previousNode(node) {
  	if (node.previousSibling) {
  		node = node.previousSibling;
  		while (node.hasChildNodes()) {
  			node = node.lastChild;
  		}
  		return node;
  	}
  	if (node.parentNode
  	&& node.parentNode.nodeType == Node.ELEMENT_NODE) {
  		return node.parentNode;
  	}
  	return null;
  }
  
  function nextNodeDescendants(node) {
  	while (node && !node.nextSibling) {
  		node = node.parentNode;
  	}
  	if (!node) {
  		return null;
  	}
  	return node.nextSibling;
  }
  
  /**
   * Returns true if ancestor is an ancestor of descendant, false otherwise.
   */
  function isAncestor(ancestor, descendant) {
  	return ancestor
  		&& descendant
  		&& Boolean(ancestor.compareDocumentPosition(descendant) & Node.DOCUMENT_POSITION_CONTAINED_BY);
  }
  
  /**
   * Returns true if ancestor is an ancestor of or equal to descendant, false
   * otherwise.
   */
  function isAncestorContainer(ancestor, descendant) {
  	return (ancestor || descendant)
  		&& (ancestor == descendant || isAncestor(ancestor, descendant));
  }
  
  /**
   * Returns true if descendant is a descendant of ancestor, false otherwise.
   */
  function isDescendant(descendant, ancestor) {
  	return ancestor
  		&& descendant
  		&& Boolean(ancestor.compareDocumentPosition(descendant) & Node.DOCUMENT_POSITION_CONTAINED_BY);
  }
  
  /**
   * Returns true if node1 is before node2 in tree order, false otherwise.
   */
  function isBefore(node1, node2) {
  	return Boolean(node1.compareDocumentPosition(node2) & Node.DOCUMENT_POSITION_FOLLOWING);
  }
  
  /**
   * Returns true if node1 is after node2 in tree order, false otherwise.
   */
  function isAfter(node1, node2) {
  	return Boolean(node1.compareDocumentPosition(node2) & Node.DOCUMENT_POSITION_PRECEDING);
  }
  
  function getAncestors(node) {
  	var ancestors = [];
  	while (node.parentNode) {
  		ancestors.unshift(node.parentNode);
  		node = node.parentNode;
  	}
  	return ancestors;
  }
  
  function getInclusiveAncestors(node) {
  	return getAncestors(node).concat(node);
  }
  
  function getDescendants(node) {
  	var descendants = [];
  	var stop = nextNodeDescendants(node);
  	while ((node = nextNode(node))
  	&& node != stop) {
  		descendants.push(node);
  	}
  	return descendants;
  }
  
  function getInclusiveDescendants(node) {
  	return [node].concat(getDescendants(node));
  }
  
  function convertProperty(property) {
  	// Special-case for now
  	var map = {
  		"fontFamily": "font-family",
  		"fontSize": "font-size",
  		"fontStyle": "font-style",
  		"fontWeight": "font-weight",
  		"textDecoration": "text-decoration",
  	};
  	if (typeof map[property] != "undefined") {
  		return map[property];
  	}
  
  	return property;
  }
  
  // Return the <font size=X> value for the given CSS size, or undefined if there
  // is none.
  function cssSizeToLegacy(cssVal) {
  	return {
  		"xx-small": 1,
  		"small": 2,
  		"medium": 3,
  		"large": 4,
  		"x-large": 5,
  		"xx-large": 6,
  		"xxx-large": 7
  	}[cssVal];
  }
  
  // Return the CSS size given a legacy size.
  function legacySizeToCss(legacyVal) {
  	return {
  		1: "xx-small",
  		2: "small",
  		3: "medium",
  		4: "large",
  		5: "x-large",
  		6: "xx-large",
  		7: "xxx-large",
  	}[legacyVal];
  }
  
  // Opera 11 puts HTML elements in the null namespace, it seems.
  function isHtmlNamespace(ns) {
  	return ns === null
  		|| ns === htmlNamespace;
  }
  
  // "the directionality" from HTML.  I don't bother caring about non-HTML
  // elements.
  //
  // "The directionality of an element is either 'ltr' or 'rtl', and is
  // determined as per the first appropriate set of steps from the following
  // list:"
  function getDirectionality(element) {
  	// "If the element's dir attribute is in the ltr state
  	//     The directionality of the element is 'ltr'."
  	if (element.dir == "ltr") {
  		return "ltr";
  	}
  
  	// "If the element's dir attribute is in the rtl state
  	//     The directionality of the element is 'rtl'."
  	if (element.dir == "rtl") {
  		return "rtl";
  	}
  
  	// "If the element's dir attribute is in the auto state
  	// "If the element is a bdi element and the dir attribute is not in a
  	// defined state (i.e. it is not present or has an invalid value)
  	//     [lots of complicated stuff]
  	//
  	// Skip this, since no browser implements it anyway.
  
  	// "If the element is a root element and the dir attribute is not in a
  	// defined state (i.e. it is not present or has an invalid value)
  	//     The directionality of the element is 'ltr'."
  	if (!isHtmlElement(element.parentNode)) {
  		return "ltr";
  	}
  
  	// "If the element has a parent element and the dir attribute is not in a
  	// defined state (i.e. it is not present or has an invalid value)
  	//     The directionality of the element is the same as the element's
  	//     parent element's directionality."
  	return getDirectionality(element.parentNode);
  }
  
  //@}
  
  ///////////////////////////////////////////////////////////////////////////////
  ///////////////////////////// DOM Range functions /////////////////////////////
  ///////////////////////////////////////////////////////////////////////////////
  //@{
  
  function getNodeIndex(node) {
  	var ret = 0;
  	while (node.previousSibling) {
  		ret++;
  		node = node.previousSibling;
  	}
  	return ret;
  }
  
  // "The length of a Node node is the following, depending on node:
  //
  // ProcessingInstruction
  // DocumentType
  //   Always 0.
  // Text
  // Comment
  //   node's length.
  // Any other node
  //   node's childNodes's length."
  function getNodeLength(node) {
  	switch (node.nodeType) {
  		case Node.PROCESSING_INSTRUCTION_NODE:
  		case Node.DOCUMENT_TYPE_NODE:
  			return 0;
  
  		case Node.TEXT_NODE:
  		case Node.COMMENT_NODE:
  			return node.length;
  
  		default:
  			return node.childNodes.length;
  	}
  }
  
  /**
   * The position of two boundary points relative to one another, as defined by
   * DOM Range.
   */
  function getPosition(nodeA, offsetA, nodeB, offsetB) {
  	// "If node A is the same as node B, return equal if offset A equals offset
  	// B, before if offset A is less than offset B, and after if offset A is
  	// greater than offset B."
  	if (nodeA == nodeB) {
  		if (offsetA == offsetB) {
  			return "equal";
  		}
  		if (offsetA < offsetB) {
  			return "before";
  		}
  		if (offsetA > offsetB) {
  			return "after";
  		}
  	}
  
  	// "If node A is after node B in tree order, compute the position of (node
  	// B, offset B) relative to (node A, offset A). If it is before, return
  	// after. If it is after, return before."
  	if (nodeB.compareDocumentPosition(nodeA) & Node.DOCUMENT_POSITION_FOLLOWING) {
  		var pos = getPosition(nodeB, offsetB, nodeA, offsetA);
  		if (pos == "before") {
  			return "after";
  		}
  		if (pos == "after") {
  			return "before";
  		}
  	}
  
  	// "If node A is an ancestor of node B:"
  	if (nodeB.compareDocumentPosition(nodeA) & Node.DOCUMENT_POSITION_CONTAINS) {
  		// "Let child equal node B."
  		var child = nodeB;
  
  		// "While child is not a child of node A, set child to its parent."
  		while (child.parentNode != nodeA) {
  			child = child.parentNode;
  		}
  
  		// "If the index of child is less than offset A, return after."
  		if (getNodeIndex(child) < offsetA) {
  			return "after";
  		}
  	}
  
  	// "Return before."
  	return "before";
  }
  
  /**
   * Returns the furthest ancestor of a Node as defined by DOM Range.
   */
  function getFurthestAncestor(node) {
  	var root = node;
  	while (root.parentNode != null) {
  		root = root.parentNode;
  	}
  	return root;
  }
  
  /**
   * "contained" as defined by DOM Range: "A Node node is contained in a range
   * range if node's furthest ancestor is the same as range's root, and (node, 0)
   * is after range's start, and (node, length of node) is before range's end."
   */
  function isContained(node, range) {
  	var pos1 = getPosition(node, 0, range.startContainer, range.startOffset);
  	var pos2 = getPosition(node, getNodeLength(node), range.endContainer, range.endOffset);
  
  	return getFurthestAncestor(node) == getFurthestAncestor(range.startContainer)
  		&& pos1 == "after"
  		&& pos2 == "before";
  }
  
  /**
   * Return all nodes contained in range that the provided function returns true
   * for, omitting any with an ancestor already being returned.
   */
  function getContainedNodes(range, condition) {
  	if (typeof condition == "undefined") {
  		condition = function() { return true };
  	}
  	var node = range.startContainer;
  	if (node.hasChildNodes()
  	&& range.startOffset < node.childNodes.length) {
  		// A child is contained
  		node = node.childNodes[range.startOffset];
  	} else if (range.startOffset == getNodeLength(node)) {
  		// No descendant can be contained
  		node = nextNodeDescendants(node);
  	} else {
  		// No children; this node at least can't be contained
  		node = nextNode(node);
  	}
  
  	var stop = range.endContainer;
  	if (stop.hasChildNodes()
  	&& range.endOffset < stop.childNodes.length) {
  		// The node after the last contained node is a child
  		stop = stop.childNodes[range.endOffset];
  	} else {
  		// This node and/or some of its children might be contained
  		stop = nextNodeDescendants(stop);
  	}
  
  	var nodeList = [];
  	while (isBefore(node, stop)) {
  		if (isContained(node, range)
  		&& condition(node)) {
  			nodeList.push(node);
  			node = nextNodeDescendants(node);
  			continue;
  		}
  		node = nextNode(node);
  	}
  	return nodeList;
  }
  
  /**
   * As above, but includes nodes with an ancestor that's already been returned.
   */
  function getAllContainedNodes(range, condition) {
  	if (typeof condition == "undefined") {
  		condition = function() { return true };
  	}
  	var node = range.startContainer;
  	if (node.hasChildNodes()
  	&& range.startOffset < node.childNodes.length) {
  		// A child is contained
  		node = node.childNodes[range.startOffset];
  	} else if (range.startOffset == getNodeLength(node)) {
  		// No descendant can be contained
  		node = nextNodeDescendants(node);
  	} else {
  		// No children; this node at least can't be contained
  		node = nextNode(node);
  	}
  
  	var stop = range.endContainer;
  	if (stop.hasChildNodes()
  	&& range.endOffset < stop.childNodes.length) {
  		// The node after the last contained node is a child
  		stop = stop.childNodes[range.endOffset];
  	} else {
  		// This node and/or some of its children might be contained
  		stop = nextNodeDescendants(stop);
  	}
  
  	var nodeList = [];
  	while (isBefore(node, stop)) {
  		if (isContained(node, range)
  		&& condition(node)) {
  			nodeList.push(node);
  		}
  		node = nextNode(node);
  	}
  	return nodeList;
  }
  
  // Returns either null, or something of the form rgb(x, y, z), or something of
  // the form rgb(x, y, z, w) with w != 0.
  function normalizeColor(color) {
  	if (color.toLowerCase() == "currentcolor") {
  		return null;
  	}
  
  	if (normalizeColor.resultCache === undefined) {
  		normalizeColor.resultCache = {};
  	}
  
  	if (normalizeColor.resultCache[color] !== undefined) {
  		return normalizeColor.resultCache[color];
  	}
  
  	var originalColor = color;
  
  	var outerSpan = document.createElement("span");
  	document.body.appendChild(outerSpan);
  	outerSpan.style.color = "black";
  
  	var innerSpan = document.createElement("span");
  	outerSpan.appendChild(innerSpan);
  	innerSpan.style.color = color;
  	color = getComputedStyle(innerSpan).color;
  
  	if (color == "rgb(0, 0, 0)") {
  		// Maybe it's really black, maybe it's invalid.
  		outerSpan.color = "white";
  		color = getComputedStyle(innerSpan).color;
  		if (color != "rgb(0, 0, 0)") {
  			return normalizeColor.resultCache[originalColor] = null;
  		}
  	}
  
  	document.body.removeChild(outerSpan);
  
  	// I rely on the fact that browsers generally provide consistent syntax for
  	// getComputedStyle(), although it's not standardized.  There are only
  	// three exceptions I found:
  	if (/^rgba\([0-9]+, [0-9]+, [0-9]+, 1\)$/.test(color)) {
  		// IE10PP2 seems to do this sometimes.
  		return normalizeColor.resultCache[originalColor] =
  			color.replace("rgba", "rgb").replace(", 1)", ")");
  	}
  	if (color == "transparent") {
  		// IE10PP2, Firefox 7.0a2, and Opera 11.50 all return "transparent" if
  		// the specified value is "transparent".
  		return normalizeColor.resultCache[originalColor] =
  			"rgba(0, 0, 0, 0)";
  	}
  	// Chrome 15 dev adds way too many significant figures.  This isn't a full
  	// fix, it just fixes one case that comes up in tests.
  	color = color.replace(/, 0.496094\)$/, ", 0.5)");
  	return normalizeColor.resultCache[originalColor] = color;
  }
  
  // Returns either null, or something of the form #xxxxxx.
  function parseSimpleColor(color) {
  	color = normalizeColor(color);
  	var matches = /^rgb\(([0-9]+), ([0-9]+), ([0-9]+)\)$/.exec(color);
  	if (matches) {
  		return "#"
  			+ parseInt(matches[1]).toString(16).replace(/^.$/, "0$&")
  			+ parseInt(matches[2]).toString(16).replace(/^.$/, "0$&")
  			+ parseInt(matches[3]).toString(16).replace(/^.$/, "0$&");
  	}
  	return null;
  }
  
  //@}
  
  //////////////////////////////////////////////////////////////////////////////
  /////////////////////////// Edit command functions ///////////////////////////
  //////////////////////////////////////////////////////////////////////////////
  
  /////////////////////////////////////////////////
  ///// Methods of the HTMLDocument interface /////
  /////////////////////////////////////////////////
  //@{
  
  var executionStackDepth = 0;
  
  // Helper function for common behavior.
  function editCommandMethod(command, range, callback) {
  	// Set up our global range magic, but only if we're the outermost function
  	if (executionStackDepth == 0 && typeof range != "undefined") {
  		globalRange = range;
  	} else if (executionStackDepth == 0) {
  		globalRange = null;
  		globalRange = getActiveRange();
  	}
  
  	// "If command is not supported, raise a NOT_SUPPORTED_ERR exception."
  	//
  	// We can't throw a real one, but a string will do for our purposes.
  	if (!(command in commands)) {
  		throw "NOT_SUPPORTED_ERR";
  	}
  
  	executionStackDepth++;
  	try {
  		var ret = callback();
  	} catch(e) {
  		executionStackDepth--;
  		throw e;
  	}
  	executionStackDepth--;
  	return ret;
  }
  
  function myExecCommand(command, showUi, value, range) {
  	// "All of these methods must treat their command argument ASCII
  	// case-insensitively."
  	command = command.toLowerCase();
  
  	// "If only one argument was provided, let show UI be false."
  	//
  	// If range was passed, I can't actually detect how many args were passed
  	// . . .
  	if (arguments.length == 1
  	|| (arguments.length >=4 && typeof showUi == "undefined")) {
  		showUi = false;
  	}
  
  	// "If only one or two arguments were provided, let value be the empty
  	// string."
  	if (arguments.length <= 2
  	|| (arguments.length >=4 && typeof value == "undefined")) {
  		value = "";
  	}
  
  	// "If command is not supported, raise a NOT_SUPPORTED_ERR exception."
  	return editCommandMethod(command, range, (function(command, showUi, value) { return function() {
  		// "If command is not enabled, return false."
  		if (!myQueryCommandEnabled(command)) {
  			return false;
  		}
  
  		// "Take the action for command, passing value to the instructions as an
  		// argument."
  		commands[command].action(value);
  
  		// "Return true."
  		return true;
  	}})(command, showUi, value));
  }
  
  function myQueryCommandEnabled(command, range) {
  	// "All of these methods must treat their command argument ASCII
  	// case-insensitively."
  	command = command.toLowerCase();
  
  	// "If command is not supported, raise a NOT_SUPPORTED_ERR exception."
  	return editCommandMethod(command, range, (function(command) { return function() {
  		// "Among commands defined in this specification, those listed in
  		// Miscellaneous commands are always enabled, except for the cut
  		// command and the paste command. The other commands defined here are
  		// enabled if the active range is not null, its start node is either
  		// editable or an editing host, its end node is either editable or an
  		// editing host, and there is some editing host that is an inclusive
  		// ancestor of both its start node and its end node."
  		return ["copy", "defaultparagraphseparator", "selectall", "stylewithcss",
  		"usecss"].indexOf(command) != -1
  			|| (
  				getActiveRange() !== null
  				&& (isEditable(getActiveRange().startContainer) || isEditingHost(getActiveRange().startContainer))
  				&& (isEditable(getActiveRange().endContainer) || isEditingHost(getActiveRange().endContainer))
  				&& (getInclusiveAncestors(getActiveRange().commonAncestorContainer).some(isEditingHost))
  			);
  	}})(command));
  }
  
  function myQueryCommandIndeterm(command, range) {
  	// "All of these methods must treat their command argument ASCII
  	// case-insensitively."
  	command = command.toLowerCase();
  
  	// "If command is not supported, raise a NOT_SUPPORTED_ERR exception."
  	return editCommandMethod(command, range, (function(command) { return function() {
  		// "If command has no indeterminacy, return false."
  		if (!("indeterm" in commands[command])) {
  			return false;
  		}
  
  		// "Return true if command is indeterminate, otherwise false."
  		return commands[command].indeterm();
  	}})(command));
  }
  
  function myQueryCommandState(command, range) {
  	// "All of these methods must treat their command argument ASCII
  	// case-insensitively."
  	command = command.toLowerCase();
  
  	// "If command is not supported, raise a NOT_SUPPORTED_ERR exception."
  	return editCommandMethod(command, range, (function(command) { return function() {
  		// "If command has no state, return false."
  		if (!("state" in commands[command])) {
  			return false;
  		}
  
  		// "If the state override for command is set, return it."
  		if (typeof getStateOverride(command) != "undefined") {
  			return getStateOverride(command);
  		}
  
  		// "Return true if command's state is true, otherwise false."
  		return commands[command].state();
  	}})(command));
  }
  
  // "When the queryCommandSupported(command) method on the HTMLDocument
  // interface is invoked, the user agent must return true if command is
  // supported, and false otherwise."
  function myQueryCommandSupported(command) {
  	// "All of these methods must treat their command argument ASCII
  	// case-insensitively."
  	command = command.toLowerCase();
  
  	return command in commands;
  }
  
  function myQueryCommandValue(command, range) {
  	// "All of these methods must treat their command argument ASCII
  	// case-insensitively."
  	command = command.toLowerCase();
  
  	// "If command is not supported, raise a NOT_SUPPORTED_ERR exception."
  	return editCommandMethod(command, range, function() {
  		// "If command has no value, return the empty string."
  		if (!("value" in commands[command])) {
  			return "";
  		}
  
  		// "If command is "fontSize" and its value override is set, convert the
  		// value override to an integer number of pixels and return the legacy
  		// font size for the result."
  		if (command == "fontsize"
  		&& getValueOverride("fontsize") !== undefined) {
  			return getLegacyFontSize(getValueOverride("fontsize"));
  		}
  
  		// "If the value override for command is set, return it."
  		if (typeof getValueOverride(command) != "undefined") {
  			return getValueOverride(command);
  		}
  
  		// "Return command's value."
  		return commands[command].value();
  	});
  }
  //@}
  
  //////////////////////////////
  ///// Common definitions /////
  //////////////////////////////
  //@{
  
  // "An HTML element is an Element whose namespace is the HTML namespace."
  //
  // I allow an extra argument to more easily check whether something is a
  // particular HTML element, like isHtmlElement(node, "OL").  It accepts arrays
  // too, like isHtmlElement(node, ["OL", "UL"]) to check if it's an ol or ul.
  function isHtmlElement(node, tags) {
  	if (typeof tags == "string") {
  		tags = [tags];
  	}
  	if (typeof tags == "object") {
  		tags = tags.map(function(tag) { return tag.toUpperCase() });
  	}
  	return node
  		&& node.nodeType == Node.ELEMENT_NODE
  		&& isHtmlNamespace(node.namespaceURI)
  		&& (typeof tags == "undefined" || tags.indexOf(node.tagName) != -1);
  }
  
  // "A prohibited paragraph child name is "address", "article", "aside",
  // "blockquote", "caption", "center", "col", "colgroup", "dd", "details",
  // "dir", "div", "dl", "dt", "fieldset", "figcaption", "figure", "footer",
  // "form", "h1", "h2", "h3", "h4", "h5", "h6", "header", "hgroup", "hr", "li",
  // "listing", "menu", "nav", "ol", "p", "plaintext", "pre", "section",
  // "summary", "table", "tbody", "td", "tfoot", "th", "thead", "tr", "ul", or
  // "xmp"."
  var prohibitedParagraphChildNames = ["address", "article", "aside",
  	"blockquote", "caption", "center", "col", "colgroup", "dd", "details",
  	"dir", "div", "dl", "dt", "fieldset", "figcaption", "figure", "footer",
  	"form", "h1", "h2", "h3", "h4", "h5", "h6", "header", "hgroup", "hr", "li",
  	"listing", "menu", "nav", "ol", "p", "plaintext", "pre", "section",
  	"summary", "table", "tbody", "td", "tfoot", "th", "thead", "tr", "ul",
  	"xmp"];
  
  // "A prohibited paragraph child is an HTML element whose local name is a
  // prohibited paragraph child name."
  function isProhibitedParagraphChild(node) {
  	return isHtmlElement(node, prohibitedParagraphChildNames);
  }
  
  // "A block node is either an Element whose "display" property does not have
  // resolved value "inline" or "inline-block" or "inline-table" or "none", or a
  // Document, or a DocumentFragment."
  function isBlockNode(node) {
  	return node
  		&& ((node.nodeType == Node.ELEMENT_NODE && ["inline", "inline-block", "inline-table", "none"].indexOf(getComputedStyle(node).display) == -1)
  		|| node.nodeType == Node.DOCUMENT_NODE
  		|| node.nodeType == Node.DOCUMENT_FRAGMENT_NODE);
  }
  
  // "An inline node is a node that is not a block node."
  function isInlineNode(node) {
  	return node && !isBlockNode(node);
  }
  
  // "An editing host is a node that is either an HTML element with a
  // contenteditable attribute set to the true state, or the HTML element child
  // of a Document whose designMode is enabled."
  function isEditingHost(node) {
  	return node
  		&& isHtmlElement(node)
  		&& (node.contentEditable == "true"
  		|| (node.parentNode
  		&& node.parentNode.nodeType == Node.DOCUMENT_NODE
  		&& node.parentNode.designMode == "on"));
  }
  
  // "Something is editable if it is a node; it is not an editing host; it does
  // not have a contenteditable attribute set to the false state; its parent is
  // an editing host or editable; and either it is an HTML element, or it is an
  // svg or math element, or it is not an Element and its parent is an HTML
  // element."
  function isEditable(node) {
  	return node
  		&& !isEditingHost(node)
  		&& (node.nodeType != Node.ELEMENT_NODE || node.contentEditable != "false")
  		&& (isEditingHost(node.parentNode) || isEditable(node.parentNode))
  		&& (isHtmlElement(node)
  		|| (node.nodeType == Node.ELEMENT_NODE && node.namespaceURI == "http://www.w3.org/2000/svg" && node.localName == "svg")
  		|| (node.nodeType == Node.ELEMENT_NODE && node.namespaceURI == "http://www.w3.org/1998/Math/MathML" && node.localName == "math")
  		|| (node.nodeType != Node.ELEMENT_NODE && isHtmlElement(node.parentNode)));
  }
  
  // Helper function, not defined in the spec
  function hasEditableDescendants(node) {
  	for (var i = 0; i < node.childNodes.length; i++) {
  		if (isEditable(node.childNodes[i])
  		|| hasEditableDescendants(node.childNodes[i])) {
  			return true;
  		}
  	}
  	return false;
  }
  
  // "The editing host of node is null if node is neither editable nor an editing
  // host; node itself, if node is an editing host; or the nearest ancestor of
  // node that is an editing host, if node is editable."
  function getEditingHostOf(node) {
  	if (isEditingHost(node)) {
  		return node;
  	} else if (isEditable(node)) {
  		var ancestor = node.parentNode;
  		while (!isEditingHost(ancestor)) {
  			ancestor = ancestor.parentNode;
  		}
  		return ancestor;
  	} else {
  		return null;
  	}
  }
  
  // "Two nodes are in the same editing host if the editing host of the first is
  // non-null and the same as the editing host of the second."
  function inSameEditingHost(node1, node2) {
  	return getEditingHostOf(node1)
  		&& getEditingHostOf(node1) == getEditingHostOf(node2);
  }
  
  // "A collapsed line break is a br that begins a line box which has nothing
  // else in it, and therefore has zero height."
  function isCollapsedLineBreak(br) {
  	if (!isHtmlElement(br, "br")) {
  		return false;
  	}
  
  	// Add a zwsp after it and see if that changes the height of the nearest
  	// non-inline parent.  Note: this is not actually reliable, because the
  	// parent might have a fixed height or something.
  	var ref = br.parentNode;
  	while (getComputedStyle(ref).display == "inline") {
  		ref = ref.parentNode;
  	}
  	var refStyle = ref.hasAttribute("style") ? ref.getAttribute("style") : null;
  	ref.style.height = "auto";
  	ref.style.maxHeight = "none";
  	ref.style.minHeight = "0";
  	var space = document.createTextNode("\u200b");
  	var origHeight = ref.offsetHeight;
  	if (origHeight == 0) {
  		throw "isCollapsedLineBreak: original height is zero, bug?";
  	}
  	br.parentNode.insertBefore(space, br.nextSibling);
  	var finalHeight = ref.offsetHeight;
  	space.parentNode.removeChild(space);
  	if (refStyle === null) {
  		// Without the setAttribute() line, removeAttribute() doesn't work in
  		// Chrome 14 dev.  I have no idea why.
  		ref.setAttribute("style", "");
  		ref.removeAttribute("style");
  	} else {
  		ref.setAttribute("style", refStyle);
  	}
  
  	// Allow some leeway in case the zwsp didn't create a whole new line, but
  	// only made an existing line slightly higher.  Firefox 6.0a2 shows this
  	// behavior when the first line is bold.
  	return origHeight < finalHeight - 5;
  }
  
  // "An extraneous line break is a br that has no visual effect, in that
  // removing it from the DOM would not change layout, except that a br that is
  // the sole child of an li is not extraneous."
  //
  // FIXME: This doesn't work in IE, since IE ignores display: none in
  // contenteditable.
  function isExtraneousLineBreak(br) {
  	if (!isHtmlElement(br, "br")) {
  		return false;
  	}
  
  	if (isHtmlElement(br.parentNode, "li")
  	&& br.parentNode.childNodes.length == 1) {
  		return false;
  	}
  
  	// Make the line break disappear and see if that changes the block's
  	// height.  Yes, this is an absurd hack.  We have to reset height etc. on
  	// the reference node because otherwise its height won't change if it's not
  	// auto.
  	var ref = br.parentNode;
  	while (getComputedStyle(ref).display == "inline") {
  		ref = ref.parentNode;
  	}
  	var refStyle = ref.hasAttribute("style") ? ref.getAttribute("style") : null;
  	ref.style.height = "auto";
  	ref.style.maxHeight = "none";
  	ref.style.minHeight = "0";
  	var brStyle = br.hasAttribute("style") ? br.getAttribute("style") : null;
  	var origHeight = ref.offsetHeight;
  	if (origHeight == 0) {
  		throw "isExtraneousLineBreak: original height is zero, bug?";
  	}
  	br.setAttribute("style", "display:none");
  	var finalHeight = ref.offsetHeight;
  	if (refStyle === null) {
  		// Without the setAttribute() line, removeAttribute() doesn't work in
  		// Chrome 14 dev.  I have no idea why.
  		ref.setAttribute("style", "");
  		ref.removeAttribute("style");
  	} else {
  		ref.setAttribute("style", refStyle);
  	}
  	if (brStyle === null) {
  		br.removeAttribute("style");
  	} else {
  		br.setAttribute("style", brStyle);
  	}
  
  	return origHeight == finalHeight;
  }
  
  // "A whitespace node is either a Text node whose data is the empty string; or
  // a Text node whose data consists only of one or more tabs (0x0009), line
  // feeds (0x000A), carriage returns (0x000D), and/or spaces (0x0020), and whose
  // parent is an Element whose resolved value for "white-space" is "normal" or
  // "nowrap"; or a Text node whose data consists only of one or more tabs
  // (0x0009), carriage returns (0x000D), and/or spaces (0x0020), and whose
  // parent is an Element whose resolved value for "white-space" is "pre-line"."
  function isWhitespaceNode(node) {
  	return node
  		&& node.nodeType == Node.TEXT_NODE
  		&& (node.data == ""
  		|| (
  			/^[\t\n\r ]+$/.test(node.data)
  			&& node.parentNode
  			&& node.parentNode.nodeType == Node.ELEMENT_NODE
  			&& ["normal", "nowrap"].indexOf(getComputedStyle(node.parentNode).whiteSpace) != -1
  		) || (
  			/^[\t\r ]+$/.test(node.data)
  			&& node.parentNode
  			&& node.parentNode.nodeType == Node.ELEMENT_NODE
  			&& getComputedStyle(node.parentNode).whiteSpace == "pre-line"
  		));
  }
  
  // "node is a collapsed whitespace node if the following algorithm returns
  // true:"
  function isCollapsedWhitespaceNode(node) {
  	// "If node is not a whitespace node, return false."
  	if (!isWhitespaceNode(node)) {
  		return false;
  	}
  
  	// "If node's data is the empty string, return true."
  	if (node.data == "") {
  		return true;
  	}
  
  	// "Let ancestor be node's parent."
  	var ancestor = node.parentNode;
  
  	// "If ancestor is null, return true."
  	if (!ancestor) {
  		return true;
  	}
  
  	// "If the "display" property of some ancestor of node has resolved value
  	// "none", return true."
  	if (getAncestors(node).some(function(ancestor) {
  		return ancestor.nodeType == Node.ELEMENT_NODE
  			&& getComputedStyle(ancestor).display == "none";
  	})) {
  		return true;
  	}
  
  	// "While ancestor is not a block node and its parent is not null, set
  	// ancestor to its parent."
  	while (!isBlockNode(ancestor)
  	&& ancestor.parentNode) {
  		ancestor = ancestor.parentNode;
  	}
  
  	// "Let reference be node."
  	var reference = node;
  
  	// "While reference is a descendant of ancestor:"
  	while (reference != ancestor) {
  		// "Let reference be the node before it in tree order."
  		reference = previousNode(reference);
  
  		// "If reference is a block node or a br, return true."
  		if (isBlockNode(reference)
  		|| isHtmlElement(reference, "br")) {
  			return true;
  		}
  
  		// "If reference is a Text node that is not a whitespace node, or is an
  		// img, break from this loop."
  		if ((reference.nodeType == Node.TEXT_NODE && !isWhitespaceNode(reference))
  		|| isHtmlElement(reference, "img")) {
  			break;
  		}
  	}
  
  	// "Let reference be node."
  	reference = node;
  
  	// "While reference is a descendant of ancestor:"
  	var stop = nextNodeDescendants(ancestor);
  	while (reference != stop) {
  		// "Let reference be the node after it in tree order, or null if there
  		// is no such node."
  		reference = nextNode(reference);
  
  		// "If reference is a block node or a br, return true."
  		if (isBlockNode(reference)
  		|| isHtmlElement(reference, "br")) {
  			return true;
  		}
  
  		// "If reference is a Text node that is not a whitespace node, or is an
  		// img, break from this loop."
  		if ((reference && reference.nodeType == Node.TEXT_NODE && !isWhitespaceNode(reference))
  		|| isHtmlElement(reference, "img")) {
  			break;
  		}
  	}
  
  	// "Return false."
  	return false;
  }
  
  // "Something is visible if it is a node that either is a block node, or a Text
  // node that is not a collapsed whitespace node, or an img, or a br that is not
  // an extraneous line break, or any node with a visible descendant; excluding
  // any node with an ancestor container Element whose "display" property has
  // resolved value "none"."
  function isVisible(node) {
  	if (!node) {
  		return false;
  	}
  
  	if (getAncestors(node).concat(node)
  	.filter(function(node) { return node.nodeType == Node.ELEMENT_NODE })
  	.some(function(node) { return getComputedStyle(node).display == "none" })) {
  		return false;
  	}
  
  	if (isBlockNode(node)
  	|| (node.nodeType == Node.TEXT_NODE && !isCollapsedWhitespaceNode(node))
  	|| isHtmlElement(node, "img")
  	|| (isHtmlElement(node, "br") && !isExtraneousLineBreak(node))) {
  		return true;
  	}
  
  	for (var i = 0; i < node.childNodes.length; i++) {
  		if (isVisible(node.childNodes[i])) {
  			return true;
  		}
  	}
  
  	return false;
  }
  
  // "Something is invisible if it is a node that is not visible."
  function isInvisible(node) {
  	return node && !isVisible(node);
  }
  
  // "A collapsed block prop is either a collapsed line break that is not an
  // extraneous line break, or an Element that is an inline node and whose
  // children are all either invisible or collapsed block props and that has at
  // least one child that is a collapsed block prop."
  function isCollapsedBlockProp(node) {
  	if (isCollapsedLineBreak(node)
  	&& !isExtraneousLineBreak(node)) {
  		return true;
  	}
  
  	if (!isInlineNode(node)
  	|| node.nodeType != Node.ELEMENT_NODE) {
  		return false;
  	}
  
  	var hasCollapsedBlockPropChild = false;
  	for (var i = 0; i < node.childNodes.length; i++) {
  		if (!isInvisible(node.childNodes[i])
  		&& !isCollapsedBlockProp(node.childNodes[i])) {
  			return false;
  		}
  		if (isCollapsedBlockProp(node.childNodes[i])) {
  			hasCollapsedBlockPropChild = true;
  		}
  	}
  
  	return hasCollapsedBlockPropChild;
  }
  
  // "The active range is the range of the selection given by calling
  // getSelection() on the context object. (Thus the active range may be null.)"
  //
  // We cheat and return globalRange if that's defined.  We also ensure that the
  // active range meets the requirements that selection boundary points are
  // supposed to meet, i.e., that the nodes are both Text or Element nodes that
  // descend from a Document.
  function getActiveRange() {
  	var ret;
  	if (globalRange) {
  		ret = globalRange;
  	} else if (getSelection().rangeCount) {
  		ret = getSelection().getRangeAt(0);
  	} else {
  		return null;
  	}
  	if ([Node.TEXT_NODE, Node.ELEMENT_NODE].indexOf(ret.startContainer.nodeType) == -1
  	|| [Node.TEXT_NODE, Node.ELEMENT_NODE].indexOf(ret.endContainer.nodeType) == -1
  	|| !ret.startContainer.ownerDocument
  	|| !ret.endContainer.ownerDocument
  	|| !isDescendant(ret.startContainer, ret.startContainer.ownerDocument)
  	|| !isDescendant(ret.endContainer, ret.endContainer.ownerDocument)) {
  		throw "Invalid active range; test bug?";
  	}
  	return ret;
  }
  
  // "For some commands, each HTMLDocument must have a boolean state override
  // and/or a string value override. These do not change the command's state or
  // value, but change the way some algorithms behave, as specified in those
  // algorithms' definitions. Initially, both must be unset for every command.
  // Whenever the number of ranges in the Selection changes to something
  // different, and whenever a boundary point of the range at a given index in
  // the Selection changes to something different, the state override and value
  // override must be unset for every command."
  //
  // We implement this crudely by using setters and getters.  To verify that the
  // selection hasn't changed, we copy the active range and just check the
  // endpoints match.  This isn't really correct, but it's good enough for us.
  // Unset state/value overrides are undefined.  We put everything in a function
  // so no one can access anything except via the provided functions, since
  // otherwise callers might mistakenly use outdated overrides (if the selection
  // has changed).
  var getStateOverride, setStateOverride, unsetStateOverride,
  	getValueOverride, setValueOverride, unsetValueOverride;
  (function() {
  	var stateOverrides = {};
  	var valueOverrides = {};
  	var storedRange = null;
  
  	function resetOverrides() {
  		if (!storedRange
  		|| storedRange.startContainer != getActiveRange().startContainer
  		|| storedRange.endContainer != getActiveRange().endContainer
  		|| storedRange.startOffset != getActiveRange().startOffset
  		|| storedRange.endOffset != getActiveRange().endOffset) {
  			stateOverrides = {};
  			valueOverrides = {};
  			storedRange = getActiveRange().cloneRange();
  		}
  	}
  
  	getStateOverride = function(command) {
  		resetOverrides();
  		return stateOverrides[command];
  	};
  
  	setStateOverride = function(command, newState) {
  		resetOverrides();
  		stateOverrides[command] = newState;
  	};
  
  	unsetStateOverride = function(command) {
  		resetOverrides();
  		delete stateOverrides[command];
  	}
  
  	getValueOverride = function(command) {
  		resetOverrides();
  		return valueOverrides[command];
  	}
  
  	// "The value override for the backColor command must be the same as the
  	// value override for the hiliteColor command, such that setting one sets
  	// the other to the same thing and unsetting one unsets the other."
  	setValueOverride = function(command, newValue) {
  		resetOverrides();
  		valueOverrides[command] = newValue;
  		if (command == "backcolor") {
  			valueOverrides.hilitecolor = newValue;
  		} else if (command == "hilitecolor") {
  			valueOverrides.backcolor = newValue;
  		}
  	}
  
  	unsetValueOverride = function(command) {
  		resetOverrides();
  		delete valueOverrides[command];
  		if (command == "backcolor") {
  			delete valueOverrides.hilitecolor;
  		} else if (command == "hilitecolor") {
  			delete valueOverrides.backcolor;
  		}
  	}
  })();
  
  //@}
  
  /////////////////////////////
  ///// Common algorithms /////
  /////////////////////////////
  
  ///// Assorted common algorithms /////
  //@{
  
  // Magic array of extra ranges whose endpoints we want to preserve.
  var extraRanges = [];
  
  function movePreservingRanges(node, newParent, newIndex) {
  	// For convenience, I allow newIndex to be -1 to mean "insert at the end".
  	if (newIndex == -1) {
  		newIndex = newParent.childNodes.length;
  	}
  
  	// "When the user agent is to move a Node to a new location, preserving
  	// ranges, it must remove the Node from its original parent (if any), then
  	// insert it in the new location. In doing so, however, it must ignore the
  	// regular range mutation rules, and instead follow these rules:"
  
  	// "Let node be the moved Node, old parent and old index be the old parent
  	// (which may be null) and index, and new parent and new index be the new
  	// parent and index."
  	var oldParent = node.parentNode;
  	var oldIndex = getNodeIndex(node);
  
  	// We preserve the global range object, the ranges in the selection, and
  	// any range that's in the extraRanges array.  Any other ranges won't get
  	// updated, because we have no references to them.
  	var ranges = [globalRange].concat(extraRanges);
  	for (var i = 0; i < getSelection().rangeCount; i++) {
  		ranges.push(getSelection().getRangeAt(i));
  	}
  	var boundaryPoints = [];
  	ranges.forEach(function(range) {
  		boundaryPoints.push([range.startContainer, range.startOffset]);
  		boundaryPoints.push([range.endContainer, range.endOffset]);
  	});
  
  	boundaryPoints.forEach(function(boundaryPoint) {
  		// "If a boundary point's node is the same as or a descendant of node,
  		// leave it unchanged, so it moves to the new location."
  		//
  		// No modifications necessary.
  
  		// "If a boundary point's node is new parent and its offset is greater
  		// than new index, add one to its offset."
  		if (boundaryPoint[0] == newParent
  		&& boundaryPoint[1] > newIndex) {
  			boundaryPoint[1]++;
  		}
  
  		// "If a boundary point's node is old parent and its offset is old index or
  		// old index + 1, set its node to new parent and add new index âˆ’ old index
  		// to its offset."
  		if (boundaryPoint[0] == oldParent
  		&& (boundaryPoint[1] == oldIndex
  		|| boundaryPoint[1] == oldIndex + 1)) {
  			boundaryPoint[0] = newParent;
  			boundaryPoint[1] += newIndex - oldIndex;
  		}
  
  		// "If a boundary point's node is old parent and its offset is greater than
  		// old index + 1, subtract one from its offset."
  		if (boundaryPoint[0] == oldParent
  		&& boundaryPoint[1] > oldIndex + 1) {
  			boundaryPoint[1]--;
  		}
  	});
  
  	// Now actually move it and preserve the ranges.
  	if (newParent.childNodes.length == newIndex) {
  		newParent.appendChild(node);
  	} else {
  		newParent.insertBefore(node, newParent.childNodes[newIndex]);
  	}
  
  	globalRange.setStart(boundaryPoints[0][0], boundaryPoints[0][1]);
  	globalRange.setEnd(boundaryPoints[1][0], boundaryPoints[1][1]);
  
  	for (var i = 0; i < extraRanges.length; i++) {
  		extraRanges[i].setStart(boundaryPoints[2*i + 2][0], boundaryPoints[2*i + 2][1]);
  		extraRanges[i].setEnd(boundaryPoints[2*i + 3][0], boundaryPoints[2*i + 3][1]);
  	}
  
  	getSelection().removeAllRanges();
  	for (var i = 1 + extraRanges.length; i < ranges.length; i++) {
  		var newRange = document.createRange();
  		newRange.setStart(boundaryPoints[2*i][0], boundaryPoints[2*i][1]);
  		newRange.setEnd(boundaryPoints[2*i + 1][0], boundaryPoints[2*i + 1][1]);
  		getSelection().addRange(newRange);
  	}
  }
  
  function setTagName(element, newName) {
  	// "If element is an HTML element with local name equal to new name, return
  	// element."
  	if (isHtmlElement(element, newName.toUpperCase())) {
  		return element;
  	}
  
  	// "If element's parent is null, return element."
  	if (!element.parentNode) {
  		return element;
  	}
  
  	// "Let replacement element be the result of calling createElement(new
  	// name) on the ownerDocument of element."
  	var replacementElement = element.ownerDocument.createElement(newName);
  
  	// "Insert replacement element into element's parent immediately before
  	// element."
  	element.parentNode.insertBefore(replacementElement, element);
  
  	// "Copy all attributes of element to replacement element, in order."
  	for (var i = 0; i < element.attributes.length; i++) {
  		replacementElement.setAttributeNS(element.attributes[i].namespaceURI, element.attributes[i].name, element.attributes[i].value);
  	}
  
  	// "While element has children, append the first child of element as the
  	// last child of replacement element, preserving ranges."
  	while (element.childNodes.length) {
  		movePreservingRanges(element.firstChild, replacementElement, replacementElement.childNodes.length);
  	}
  
  	// "Remove element from its parent."
  	element.parentNode.removeChild(element);
  
  	// "Return replacement element."
  	return replacementElement;
  }
  
  function removeExtraneousLineBreaksBefore(node) {
  	// "Let ref be the previousSibling of node."
  	var ref = node.previousSibling;
  
  	// "If ref is null, abort these steps."
  	if (!ref) {
  		return;
  	}
  
  	// "While ref has children, set ref to its lastChild."
  	while (ref.hasChildNodes()) {
  		ref = ref.lastChild;
  	}
  
  	// "While ref is invisible but not an extraneous line break, and ref does
  	// not equal node's parent, set ref to the node before it in tree order."
  	while (isInvisible(ref)
  	&& !isExtraneousLineBreak(ref)
  	&& ref != node.parentNode) {
  		ref = previousNode(ref);
  	}
  
  	// "If ref is an editable extraneous line break, remove it from its
  	// parent."
  	if (isEditable(ref)
  	&& isExtraneousLineBreak(ref)) {
  		ref.parentNode.removeChild(ref);
  	}
  }
  
  function removeExtraneousLineBreaksAtTheEndOf(node) {
  	// "Let ref be node."
  	var ref = node;
  
  	// "While ref has children, set ref to its lastChild."
  	while (ref.hasChildNodes()) {
  		ref = ref.lastChild;
  	}
  
  	// "While ref is invisible but not an extraneous line break, and ref does
  	// not equal node, set ref to the node before it in tree order."
  	while (isInvisible(ref)
  	&& !isExtraneousLineBreak(ref)
  	&& ref != node) {
  		ref = previousNode(ref);
  	}
  
  	// "If ref is an editable extraneous line break:"
  	if (isEditable(ref)
  	&& isExtraneousLineBreak(ref)) {
  		// "While ref's parent is editable and invisible, set ref to its
  		// parent."
  		while (isEditable(ref.parentNode)
  		&& isInvisible(ref.parentNode)) {
  			ref = ref.parentNode;
  		}
  
  		// "Remove ref from its parent."
  		ref.parentNode.removeChild(ref);
  	}
  }
  
  // "To remove extraneous line breaks from a node, first remove extraneous line
  // breaks before it, then remove extraneous line breaks at the end of it."
  function removeExtraneousLineBreaksFrom(node) {
  	removeExtraneousLineBreaksBefore(node);
  	removeExtraneousLineBreaksAtTheEndOf(node);
  }
  
  //@}
  ///// Wrapping a list of nodes /////
  //@{
  
  function wrap(nodeList, siblingCriteria, newParentInstructions) {
  	// "If not provided, sibling criteria returns false and new parent
  	// instructions returns null."
  	if (typeof siblingCriteria == "undefined") {
  		siblingCriteria = function() { return false };
  	}
  	if (typeof newParentInstructions == "undefined") {
  		newParentInstructions = function() { return null };
  	}
  
  	// "If every member of node list is invisible, and none is a br, return
  	// null and abort these steps."
  	if (nodeList.every(isInvisible)
  	&& !nodeList.some(function(node) { return isHtmlElement(node, "br") })) {
  		return null;
  	}
  
  	// "If node list's first member's parent is null, return null and abort
  	// these steps."
  	if (!nodeList[0].parentNode) {
  		return null;
  	}
  
  	// "If node list's last member is an inline node that's not a br, and node
  	// list's last member's nextSibling is a br, append that br to node list."
  	if (isInlineNode(nodeList[nodeList.length - 1])
  	&& !isHtmlElement(nodeList[nodeList.length - 1], "br")
  	&& isHtmlElement(nodeList[nodeList.length - 1].nextSibling, "br")) {
  		nodeList.push(nodeList[nodeList.length - 1].nextSibling);
  	}
  
  	// "While node list's first member's previousSibling is invisible, prepend
  	// it to node list."
  	while (isInvisible(nodeList[0].previousSibling)) {
  		nodeList.unshift(nodeList[0].previousSibling);
  	}
  
  	// "While node list's last member's nextSibling is invisible, append it to
  	// node list."
  	while (isInvisible(nodeList[nodeList.length - 1].nextSibling)) {
  		nodeList.push(nodeList[nodeList.length - 1].nextSibling);
  	}
  
  	// "If the previousSibling of the first member of node list is editable and
  	// running sibling criteria on it returns true, let new parent be the
  	// previousSibling of the first member of node list."
  	var newParent;
  	if (isEditable(nodeList[0].previousSibling)
  	&& siblingCriteria(nodeList[0].previousSibling)) {
  		newParent = nodeList[0].previousSibling;
  
  	// "Otherwise, if the nextSibling of the last member of node list is
  	// editable and running sibling criteria on it returns true, let new parent
  	// be the nextSibling of the last member of node list."
  	} else if (isEditable(nodeList[nodeList.length - 1].nextSibling)
  	&& siblingCriteria(nodeList[nodeList.length - 1].nextSibling)) {
  		newParent = nodeList[nodeList.length - 1].nextSibling;
  
  	// "Otherwise, run new parent instructions, and let new parent be the
  	// result."
  	} else {
  		newParent = newParentInstructions();
  	}
  
  	// "If new parent is null, abort these steps and return null."
  	if (!newParent) {
  		return null;
  	}
  
  	// "If new parent's parent is null:"
  	if (!newParent.parentNode) {
  		// "Insert new parent into the parent of the first member of node list
  		// immediately before the first member of node list."
  		nodeList[0].parentNode.insertBefore(newParent, nodeList[0]);
  
  		// "If any range has a boundary point with node equal to the parent of
  		// new parent and offset equal to the index of new parent, add one to
  		// that boundary point's offset."
  		//
  		// Only try to fix the global range.
  		if (globalRange.startContainer == newParent.parentNode
  		&& globalRange.startOffset == getNodeIndex(newParent)) {
  			globalRange.setStart(globalRange.startContainer, globalRange.startOffset + 1);
  		}
  		if (globalRange.endContainer == newParent.parentNode
  		&& globalRange.endOffset == getNodeIndex(newParent)) {
  			globalRange.setEnd(globalRange.endContainer, globalRange.endOffset + 1);
  		}
  	}
  
  	// "Let original parent be the parent of the first member of node list."
  	var originalParent = nodeList[0].parentNode;
  
  	// "If new parent is before the first member of node list in tree order:"
  	if (isBefore(newParent, nodeList[0])) {
  		// "If new parent is not an inline node, but the last visible child of
  		// new parent and the first visible member of node list are both inline
  		// nodes, and the last child of new parent is not a br, call
  		// createElement("br") on the ownerDocument of new parent and append
  		// the result as the last child of new parent."
  		if (!isInlineNode(newParent)
  		&& isInlineNode([].filter.call(newParent.childNodes, isVisible).slice(-1)[0])
  		&& isInlineNode(nodeList.filter(isVisible)[0])
  		&& !isHtmlElement(newParent.lastChild, "BR")) {
  			newParent.appendChild(newParent.ownerDocument.createElement("br"));
  		}
  
  		// "For each node in node list, append node as the last child of new
  		// parent, preserving ranges."
  		for (var i = 0; i < nodeList.length; i++) {
  			movePreservingRanges(nodeList[i], newParent, -1);
  		}
  
  	// "Otherwise:"
  	} else {
  		// "If new parent is not an inline node, but the first visible child of
  		// new parent and the last visible member of node list are both inline
  		// nodes, and the last member of node list is not a br, call
  		// createElement("br") on the ownerDocument of new parent and insert
  		// the result as the first child of new parent."
  		if (!isInlineNode(newParent)
  		&& isInlineNode([].filter.call(newParent.childNodes, isVisible)[0])
  		&& isInlineNode(nodeList.filter(isVisible).slice(-1)[0])
  		&& !isHtmlElement(nodeList[nodeList.length - 1], "BR")) {
  			newParent.insertBefore(newParent.ownerDocument.createElement("br"), newParent.firstChild);
  		}
  
  		// "For each node in node list, in reverse order, insert node as the
  		// first child of new parent, preserving ranges."
  		for (var i = nodeList.length - 1; i >= 0; i--) {
  			movePreservingRanges(nodeList[i], newParent, 0);
  		}
  	}
  
  	// "If original parent is editable and has no children, remove it from its
  	// parent."
  	if (isEditable(originalParent) && !originalParent.hasChildNodes()) {
  		originalParent.parentNode.removeChild(originalParent);
  	}
  
  	// "If new parent's nextSibling is editable and running sibling criteria on
  	// it returns true:"
  	if (isEditable(newParent.nextSibling)
  	&& siblingCriteria(newParent.nextSibling)) {
  		// "If new parent is not an inline node, but new parent's last child
  		// and new parent's nextSibling's first child are both inline nodes,
  		// and new parent's last child is not a br, call createElement("br") on
  		// the ownerDocument of new parent and append the result as the last
  		// child of new parent."
  		if (!isInlineNode(newParent)
  		&& isInlineNode(newParent.lastChild)
  		&& isInlineNode(newParent.nextSibling.firstChild)
  		&& !isHtmlElement(newParent.lastChild, "BR")) {
  			newParent.appendChild(newParent.ownerDocument.createElement("br"));
  		}
  
  		// "While new parent's nextSibling has children, append its first child
  		// as the last child of new parent, preserving ranges."
  		while (newParent.nextSibling.hasChildNodes()) {
  			movePreservingRanges(newParent.nextSibling.firstChild, newParent, -1);
  		}
  
  		// "Remove new parent's nextSibling from its parent."
  		newParent.parentNode.removeChild(newParent.nextSibling);
  	}
  
  	// "Remove extraneous line breaks from new parent."
  	removeExtraneousLineBreaksFrom(newParent);
  
  	// "Return new parent."
  	return newParent;
  }
  
  
  //@}
  ///// Allowed children /////
  //@{
  
  // "A name of an element with inline contents is "a", "abbr", "b", "bdi",
  // "bdo", "cite", "code", "dfn", "em", "h1", "h2", "h3", "h4", "h5", "h6", "i",
  // "kbd", "mark", "p", "pre", "q", "rp", "rt", "ruby", "s", "samp", "small",
  // "span", "strong", "sub", "sup", "u", "var", "acronym", "listing", "strike",
  // "xmp", "big", "blink", "font", "marquee", "nobr", or "tt"."
  var namesOfElementsWithInlineContents = ["a", "abbr", "b", "bdi", "bdo",
  	"cite", "code", "dfn", "em", "h1", "h2", "h3", "h4", "h5", "h6", "i",
  	"kbd", "mark", "p", "pre", "q", "rp", "rt", "ruby", "s", "samp", "small",
  	"span", "strong", "sub", "sup", "u", "var", "acronym", "listing", "strike",
  	"xmp", "big", "blink", "font", "marquee", "nobr", "tt"];
  
  // "An element with inline contents is an HTML element whose local name is a
  // name of an element with inline contents."
  function isElementWithInlineContents(node) {
  	return isHtmlElement(node, namesOfElementsWithInlineContents);
  }
  
  function isAllowedChild(child, parent_) {
  	// "If parent is "colgroup", "table", "tbody", "tfoot", "thead", "tr", or
  	// an HTML element with local name equal to one of those, and child is a
  	// Text node whose data does not consist solely of space characters, return
  	// false."
  	if ((["colgroup", "table", "tbody", "tfoot", "thead", "tr"].indexOf(parent_) != -1
  	|| isHtmlElement(parent_, ["colgroup", "table", "tbody", "tfoot", "thead", "tr"]))
  	&& typeof child == "object"
  	&& child.nodeType == Node.TEXT_NODE
  	&& !/^[ \t\n\f\r]*$/.test(child.data)) {
  		return false;
  	}
  
  	// "If parent is "script", "style", "plaintext", or "xmp", or an HTML
  	// element with local name equal to one of those, and child is not a Text
  	// node, return false."
  	if ((["script", "style", "plaintext", "xmp"].indexOf(parent_) != -1
  	|| isHtmlElement(parent_, ["script", "style", "plaintext", "xmp"]))
  	&& (typeof child != "object" || child.nodeType != Node.TEXT_NODE)) {
  		return false;
  	}
  
  	// "If child is a Document, DocumentFragment, or DocumentType, return
  	// false."
  	if (typeof child == "object"
  	&& (child.nodeType == Node.DOCUMENT_NODE
  	|| child.nodeType == Node.DOCUMENT_FRAGMENT_NODE
  	|| child.nodeType == Node.DOCUMENT_TYPE_NODE)) {
  		return false;
  	}
  
  	// "If child is an HTML element, set child to the local name of child."
  	if (isHtmlElement(child)) {
  		child = child.tagName.toLowerCase();
  	}
  
  	// "If child is not a string, return true."
  	if (typeof child != "string") {
  		return true;
  	}
  
  	// "If parent is an HTML element:"
  	if (isHtmlElement(parent_)) {
  		// "If child is "a", and parent or some ancestor of parent is an a,
  		// return false."
  		//
  		// "If child is a prohibited paragraph child name and parent or some
  		// ancestor of parent is an element with inline contents, return
  		// false."
  		//
  		// "If child is "h1", "h2", "h3", "h4", "h5", or "h6", and parent or
  		// some ancestor of parent is an HTML element with local name "h1",
  		// "h2", "h3", "h4", "h5", or "h6", return false."
  		var ancestor = parent_;
  		while (ancestor) {
  			if (child == "a" && isHtmlElement(ancestor, "a")) {
  				return false;
  			}
  			if (prohibitedParagraphChildNames.indexOf(child) != -1
  			&& isElementWithInlineContents(ancestor)) {
  				return false;
  			}
  			if (/^h[1-6]$/.test(child)
  			&& isHtmlElement(ancestor)
  			&& /^H[1-6]$/.test(ancestor.tagName)) {
  				return false;
  			}
  			ancestor = ancestor.parentNode;
  		}
  
  		// "Let parent be the local name of parent."
  		parent_ = parent_.tagName.toLowerCase();
  	}
  
  	// "If parent is an Element or DocumentFragment, return true."
  	if (typeof parent_ == "object"
  	&& (parent_.nodeType == Node.ELEMENT_NODE
  	|| parent_.nodeType == Node.DOCUMENT_FRAGMENT_NODE)) {
  		return true;
  	}
  
  	// "If parent is not a string, return false."
  	if (typeof parent_ != "string") {
  		return false;
  	}
  
  	// "If parent is on the left-hand side of an entry on the following list,
  	// then return true if child is listed on the right-hand side of that
  	// entry, and false otherwise."
  	switch (parent_) {
  		case "colgroup":
  			return child == "col";
  		case "table":
  			return ["caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"].indexOf(child) != -1;
  		case "tbody":
  		case "thead":
  		case "tfoot":
  			return ["td", "th", "tr"].indexOf(child) != -1;
  		case "tr":
  			return ["td", "th"].indexOf(child) != -1;
  		case "dl":
  			return ["dt", "dd"].indexOf(child) != -1;
  		case "dir":
  		case "ol":
  		case "ul":
  			return ["dir", "li", "ol", "ul"].indexOf(child) != -1;
  		case "hgroup":
  			return /^h[1-6]$/.test(child);
  	}
  
  	// "If child is "body", "caption", "col", "colgroup", "frame", "frameset",
  	// "head", "html", "tbody", "td", "tfoot", "th", "thead", or "tr", return
  	// false."
  	if (["body", "caption", "col", "colgroup", "frame", "frameset", "head",
  	"html", "tbody", "td", "tfoot", "th", "thead", "tr"].indexOf(child) != -1) {
  		return false;
  	}
  
  	// "If child is "dd" or "dt" and parent is not "dl", return false."
  	if (["dd", "dt"].indexOf(child) != -1
  	&& parent_ != "dl") {
  		return false;
  	}
  
  	// "If child is "li" and parent is not "ol" or "ul", return false."
  	if (child == "li"
  	&& parent_ != "ol"
  	&& parent_ != "ul") {
  		return false;
  	}
  
  	// "If parent is on the left-hand side of an entry on the following list
  	// and child is listed on the right-hand side of that entry, return false."
  	var table = [
  		[["a"], ["a"]],
  		[["dd", "dt"], ["dd", "dt"]],
  		[["h1", "h2", "h3", "h4", "h5", "h6"], ["h1", "h2", "h3", "h4", "h5", "h6"]],
  		[["li"], ["li"]],
  		[["nobr"], ["nobr"]],
  		[namesOfElementsWithInlineContents, prohibitedParagraphChildNames],
  		[["td", "th"], ["caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"]],
  	];
  	for (var i = 0; i < table.length; i++) {
  		if (table[i][0].indexOf(parent_) != -1
  		&& table[i][1].indexOf(child) != -1) {
  			return false;
  		}
  	}
  
  	// "Return true."
  	return true;
  }
  
  
  //@}
  
  //////////////////////////////////////
  ///// Inline formatting commands /////
  //////////////////////////////////////
  
  ///// Inline formatting command definitions /////
  //@{
  
  // "A node node is effectively contained in a range range if range is not
  // collapsed, and at least one of the following holds:"
  function isEffectivelyContained(node, range) {
  	if (range.collapsed) {
  		return false;
  	}
  
  	// "node is contained in range."
  	if (isContained(node, range)) {
  		return true;
  	}
  
  	// "node is range's start node, it is a Text node, and its length is
  	// different from range's start offset."
  	if (node == range.startContainer
  	&& node.nodeType == Node.TEXT_NODE
  	&& getNodeLength(node) != range.startOffset) {
  		return true;
  	}
  
  	// "node is range's end node, it is a Text node, and range's end offset is
  	// not 0."
  	if (node == range.endContainer
  	&& node.nodeType == Node.TEXT_NODE
  	&& range.endOffset != 0) {
  		return true;
  	}
  
  	// "node has at least one child; and all its children are effectively
  	// contained in range; and either range's start node is not a descendant of
  	// node or is not a Text node or range's start offset is zero; and either
  	// range's end node is not a descendant of node or is not a Text node or
  	// range's end offset is its end node's length."
  	if (node.hasChildNodes()
  	&& [].every.call(node.childNodes, function(child) { return isEffectivelyContained(child, range) })
  	&& (!isDescendant(range.startContainer, node)
  	|| range.startContainer.nodeType != Node.TEXT_NODE
  	|| range.startOffset == 0)
  	&& (!isDescendant(range.endContainer, node)
  	|| range.endContainer.nodeType != Node.TEXT_NODE
  	|| range.endOffset == getNodeLength(range.endContainer))) {
  		return true;
  	}
  
  	return false;
  }
  
  // Like get(All)ContainedNodes(), but for effectively contained nodes.
  function getEffectivelyContainedNodes(range, condition) {
  	if (typeof condition == "undefined") {
  		condition = function() { return true };
  	}
  	var node = range.startContainer;
  	while (isEffectivelyContained(node.parentNode, range)) {
  		node = node.parentNode;
  	}
  
  	var stop = nextNodeDescendants(range.endContainer);
  
  	var nodeList = [];
  	while (isBefore(node, stop)) {
  		if (isEffectivelyContained(node, range)
  		&& condition(node)) {
  			nodeList.push(node);
  			node = nextNodeDescendants(node);
  			continue;
  		}
  		node = nextNode(node);
  	}
  	return nodeList;
  }
  
  function getAllEffectivelyContainedNodes(range, condition) {
  	if (typeof condition == "undefined") {
  		condition = function() { return true };
  	}
  	var node = range.startContainer;
  	while (isEffectivelyContained(node.parentNode, range)) {
  		node = node.parentNode;
  	}
  
  	var stop = nextNodeDescendants(range.endContainer);
  
  	var nodeList = [];
  	while (isBefore(node, stop)) {
  		if (isEffectivelyContained(node, range)
  		&& condition(node)) {
  			nodeList.push(node);
  		}
  		node = nextNode(node);
  	}
  	return nodeList;
  }
  
  // "A modifiable element is a b, em, i, s, span, strong, sub, sup, or u element
  // with no attributes except possibly style; or a font element with no
  // attributes except possibly style, color, face, and/or size; or an a element
  // with no attributes except possibly style and/or href."
  function isModifiableElement(node) {
  	if (!isHtmlElement(node)) {
  		return false;
  	}
  
  	if (["B", "EM", "I", "S", "SPAN", "STRIKE", "STRONG", "SUB", "SUP", "U"].indexOf(node.tagName) != -1) {
  		if (node.attributes.length == 0) {
  			return true;
  		}
  
  		if (node.attributes.length == 1
  		&& node.hasAttribute("style")) {
  			return true;
  		}
  	}
  
  	if (node.tagName == "FONT" || node.tagName == "A") {
  		var numAttrs = node.attributes.length;
  
  		if (node.hasAttribute("style")) {
  			numAttrs--;
  		}
  
  		if (node.tagName == "FONT") {
  			if (node.hasAttribute("color")) {
  				numAttrs--;
  			}
  
  			if (node.hasAttribute("face")) {
  				numAttrs--;
  			}
  
  			if (node.hasAttribute("size")) {
  				numAttrs--;
  			}
  		}
  
  		if (node.tagName == "A"
  		&& node.hasAttribute("href")) {
  			numAttrs--;
  		}
  
  		if (numAttrs == 0) {
  			return true;
  		}
  	}
  
  	return false;
  }
  
  function isSimpleModifiableElement(node) {
  	// "A simple modifiable element is an HTML element for which at least one
  	// of the following holds:"
  	if (!isHtmlElement(node)) {
  		return false;
  	}
  
  	// Only these elements can possibly be a simple modifiable element.
  	if (["A", "B", "EM", "FONT", "I", "S", "SPAN", "STRIKE", "STRONG", "SUB", "SUP", "U"].indexOf(node.tagName) == -1) {
  		return false;
  	}
  
  	// "It is an a, b, em, font, i, s, span, strike, strong, sub, sup, or u
  	// element with no attributes."
  	if (node.attributes.length == 0) {
  		return true;
  	}
  
  	// If it's got more than one attribute, everything after this fails.
  	if (node.attributes.length > 1) {
  		return false;
  	}
  
  	// "It is an a, b, em, font, i, s, span, strike, strong, sub, sup, or u
  	// element with exactly one attribute, which is style, which sets no CSS
  	// properties (including invalid or unrecognized properties)."
  	//
  	// Not gonna try for invalid or unrecognized.
  	if (node.hasAttribute("style")
  	&& node.style.length == 0) {
  		return true;
  	}
  
  	// "It is an a element with exactly one attribute, which is href."
  	if (node.tagName == "A"
  	&& node.hasAttribute("href")) {
  		return true;
  	}
  
  	// "It is a font element with exactly one attribute, which is either color,
  	// face, or size."
  	if (node.tagName == "FONT"
  	&& (node.hasAttribute("color")
  	|| node.hasAttribute("face")
  	|| node.hasAttribute("size")
  	)) {
  		return true;
  	}
  
  	// "It is a b or strong element with exactly one attribute, which is style,
  	// and the style attribute sets exactly one CSS property (including invalid
  	// or unrecognized properties), which is "font-weight"."
  	if ((node.tagName == "B" || node.tagName == "STRONG")
  	&& node.hasAttribute("style")
  	&& node.style.length == 1
  	&& node.style.fontWeight != "") {
  		return true;
  	}
  
  	// "It is an i or em element with exactly one attribute, which is style,
  	// and the style attribute sets exactly one CSS property (including invalid
  	// or unrecognized properties), which is "font-style"."
  	if ((node.tagName == "I" || node.tagName == "EM")
  	&& node.hasAttribute("style")
  	&& node.style.length == 1
  	&& node.style.fontStyle != "") {
  		return true;
  	}
  
  	// "It is an a, font, or span element with exactly one attribute, which is
  	// style, and the style attribute sets exactly one CSS property (including
  	// invalid or unrecognized properties), and that property is not
  	// "text-decoration"."
  	if ((node.tagName == "A" || node.tagName == "FONT" || node.tagName == "SPAN")
  	&& node.hasAttribute("style")
  	&& node.style.length == 1
  	&& node.style.textDecoration == "") {
  		return true;
  	}
  
  	// "It is an a, font, s, span, strike, or u element with exactly one
  	// attribute, which is style, and the style attribute sets exactly one CSS
  	// property (including invalid or unrecognized properties), which is
  	// "text-decoration", which is set to "line-through" or "underline" or
  	// "overline" or "none"."
  	//
  	// The weird extra node.style.length check is for Firefox, which as of
  	// 8.0a2 has annoying and weird behavior here.
  	if (["A", "FONT", "S", "SPAN", "STRIKE", "U"].indexOf(node.tagName) != -1
  	&& node.hasAttribute("style")
  	&& (node.style.length == 1
  	|| (node.style.length == 4
  		&& "MozTextBlink" in node.style
  		&& "MozTextDecorationColor" in node.style
  		&& "MozTextDecorationLine" in node.style
  		&& "MozTextDecorationStyle" in node.style)
  	)
  	&& (node.style.textDecoration == "line-through"
  	|| node.style.textDecoration == "underline"
  	|| node.style.textDecoration == "overline"
  	|| node.style.textDecoration == "none")) {
  		return true;
  	}
  
  	return false;
  }
  
  // "A formattable node is an editable visible node that is either a Text node,
  // an img, or a br."
  function isFormattableNode(node) {
  	return isEditable(node)
  		&& isVisible(node)
  		&& (node.nodeType == Node.TEXT_NODE
  		|| isHtmlElement(node, ["img", "br"]));
  }
  
  // "Two quantities are equivalent values for a command if either both are null,
  // or both are strings and they're equal and the command does not define any
  // equivalent values, or both are strings and the command defines equivalent
  // values and they match the definition."
  function areEquivalentValues(command, val1, val2) {
  	if (val1 === null && val2 === null) {
  		return true;
  	}
  
  	if (typeof val1 == "string"
  	&& typeof val2 == "string"
  	&& val1 == val2
  	&& !("equivalentValues" in commands[command])) {
  		return true;
  	}
  
  	if (typeof val1 == "string"
  	&& typeof val2 == "string"
  	&& "equivalentValues" in commands[command]
  	&& commands[command].equivalentValues(val1, val2)) {
  		return true;
  	}
  
  	return false;
  }
  
  // "Two quantities are loosely equivalent values for a command if either they
  // are equivalent values for the command, or if the command is the fontSize
  // command; one of the quantities is one of "xx-small", "small", "medium",
  // "large", "x-large", "xx-large", or "xxx-large"; and the other quantity is
  // the resolved value of "font-size" on a font element whose size attribute has
  // the corresponding value set ("1" through "7" respectively)."
  function areLooselyEquivalentValues(command, val1, val2) {
  	if (areEquivalentValues(command, val1, val2)) {
  		return true;
  	}
  
  	if (command != "fontsize"
  	|| typeof val1 != "string"
  	|| typeof val2 != "string") {
  		return false;
  	}
  
  	// Static variables in JavaScript?
  	var callee = areLooselyEquivalentValues;
  	if (callee.sizeMap === undefined) {
  		callee.sizeMap = {};
  		var font = document.createElement("font");
  		document.body.appendChild(font);
  		["xx-small", "small", "medium", "large", "x-large", "xx-large",
  		"xxx-large"].forEach(function(keyword) {
  			font.size = cssSizeToLegacy(keyword);
  			callee.sizeMap[keyword] = getComputedStyle(font).fontSize;
  		});
  		document.body.removeChild(font);
  	}
  
  	return val1 === callee.sizeMap[val2]
  		|| val2 === callee.sizeMap[val1];
  }
  
  //@}
  ///// Assorted inline formatting command algorithms /////
  //@{
  
  function getEffectiveCommandValue(node, command) {
  	// "If neither node nor its parent is an Element, return null."
  	if (node.nodeType != Node.ELEMENT_NODE
  	&& (!node.parentNode || node.parentNode.nodeType != Node.ELEMENT_NODE)) {
  		return null;
  	}
  
  	// "If node is not an Element, return the effective command value of its
  	// parent for command."
  	if (node.nodeType != Node.ELEMENT_NODE) {
  		return getEffectiveCommandValue(node.parentNode, command);
  	}
  
  	// "If command is "createLink" or "unlink":"
  	if (command == "createlink" || command == "unlink") {
  		// "While node is not null, and is not an a element that has an href
  		// attribute, set node to its parent."
  		while (node
  		&& (!isHtmlElement(node)
  		|| node.tagName != "A"
  		|| !node.hasAttribute("href"))) {
  			node = node.parentNode;
  		}
  
  		// "If node is null, return null."
  		if (!node) {
  			return null;
  		}
  
  		// "Return the value of node's href attribute."
  		return node.getAttribute("href");
  	}
  
  	// "If command is "backColor" or "hiliteColor":"
  	if (command == "backcolor"
  	|| command == "hilitecolor") {
  		// "While the resolved value of "background-color" on node is any
  		// fully transparent value, and node's parent is an Element, set
  		// node to its parent."
  		//
  		// Another lame hack to avoid flawed APIs.
  		while ((getComputedStyle(node).backgroundColor == "rgba(0, 0, 0, 0)"
  		|| getComputedStyle(node).backgroundColor === ""
  		|| getComputedStyle(node).backgroundColor == "transparent")
  		&& node.parentNode
  		&& node.parentNode.nodeType == Node.ELEMENT_NODE) {
  			node = node.parentNode;
  		}
  
  		// "Return the resolved value of "background-color" for node."
  		return getComputedStyle(node).backgroundColor;
  	}
  
  	// "If command is "subscript" or "superscript":"
  	if (command == "subscript" || command == "superscript") {
  		// "Let affected by subscript and affected by superscript be two
  		// boolean variables, both initially false."
  		var affectedBySubscript = false;
  		var affectedBySuperscript = false;
  
  		// "While node is an inline node:"
  		while (isInlineNode(node)) {
  			var verticalAlign = getComputedStyle(node).verticalAlign;
  
  			// "If node is a sub, set affected by subscript to true."
  			if (isHtmlElement(node, "sub")) {
  				affectedBySubscript = true;
  			// "Otherwise, if node is a sup, set affected by superscript to
  			// true."
  			} else if (isHtmlElement(node, "sup")) {
  				affectedBySuperscript = true;
  			}
  
  			// "Set node to its parent."
  			node = node.parentNode;
  		}
  
  		// "If affected by subscript and affected by superscript are both true,
  		// return the string "mixed"."
  		if (affectedBySubscript && affectedBySuperscript) {
  			return "mixed";
  		}
  
  		// "If affected by subscript is true, return "subscript"."
  		if (affectedBySubscript) {
  			return "subscript";
  		}
  
  		// "If affected by superscript is true, return "superscript"."
  		if (affectedBySuperscript) {
  			return "superscript";
  		}
  
  		// "Return null."
  		return null;
  	}
  
  	// "If command is "strikethrough", and the "text-decoration" property of
  	// node or any of its ancestors has resolved value containing
  	// "line-through", return "line-through". Otherwise, return null."
  	if (command == "strikethrough") {
  		do {
  			if (getComputedStyle(node).textDecoration.indexOf("line-through") != -1) {
  				return "line-through";
  			}
  			node = node.parentNode;
  		} while (node && node.nodeType == Node.ELEMENT_NODE);
  		return null;
  	}
  
  	// "If command is "underline", and the "text-decoration" property of node
  	// or any of its ancestors has resolved value containing "underline",
  	// return "underline". Otherwise, return null."
  	if (command == "underline") {
  		do {
  			if (getComputedStyle(node).textDecoration.indexOf("underline") != -1) {
  				return "underline";
  			}
  			node = node.parentNode;
  		} while (node && node.nodeType == Node.ELEMENT_NODE);
  		return null;
  	}
  
  	if (!("relevantCssProperty" in commands[command])) {
  		throw "Bug: no relevantCssProperty for " + command + " in getEffectiveCommandValue";
  	}
  
  	// "Return the resolved value for node of the relevant CSS property for
  	// command."
  	return getComputedStyle(node)[commands[command].relevantCssProperty];
  }
  
  function getSpecifiedCommandValue(element, command) {
  	// "If command is "backColor" or "hiliteColor" and element's display
  	// property does not have resolved value "inline", return null."
  	if ((command == "backcolor" || command == "hilitecolor")
  	&& getComputedStyle(element).display != "inline") {
  		return null;
  	}
  
  	// "If command is "createLink" or "unlink":"
  	if (command == "createlink" || command == "unlink") {
  		// "If element is an a element and has an href attribute, return the
  		// value of that attribute."
  		if (isHtmlElement(element)
  		&& element.tagName == "A"
  		&& element.hasAttribute("href")) {
  			return element.getAttribute("href");
  		}
  
  		// "Return null."
  		return null;
  	}
  
  	// "If command is "subscript" or "superscript":"
  	if (command == "subscript" || command == "superscript") {
  		// "If element is a sup, return "superscript"."
  		if (isHtmlElement(element, "sup")) {
  			return "superscript";
  		}
  
  		// "If element is a sub, return "subscript"."
  		if (isHtmlElement(element, "sub")) {
  			return "subscript";
  		}
  
  		// "Return null."
  		return null;
  	}
  
  	// "If command is "strikethrough", and element has a style attribute set,
  	// and that attribute sets "text-decoration":"
  	if (command == "strikethrough"
  	&& element.style.textDecoration != "") {
  		// "If element's style attribute sets "text-decoration" to a value
  		// containing "line-through", return "line-through"."
  		if (element.style.textDecoration.indexOf("line-through") != -1) {
  			return "line-through";
  		}
  
  		// "Return null."
  		return null;
  	}
  
  	// "If command is "strikethrough" and element is a s or strike element,
  	// return "line-through"."
  	if (command == "strikethrough"
  	&& isHtmlElement(element, ["S", "STRIKE"])) {
  		return "line-through";
  	}
  
  	// "If command is "underline", and element has a style attribute set, and
  	// that attribute sets "text-decoration":"
  	if (command == "underline"
  	&& element.style.textDecoration != "") {
  		// "If element's style attribute sets "text-decoration" to a value
  		// containing "underline", return "underline"."
  		if (element.style.textDecoration.indexOf("underline") != -1) {
  			return "underline";
  		}
  
  		// "Return null."
  		return null;
  	}
  
  	// "If command is "underline" and element is a u element, return
  	// "underline"."
  	if (command == "underline"
  	&& isHtmlElement(element, "U")) {
  		return "underline";
  	}
  
  	// "Let property be the relevant CSS property for command."
  	var property = commands[command].relevantCssProperty;
  
  	// "If property is null, return null."
  	if (property === null) {
  		return null;
  	}
  
  	// "If element has a style attribute set, and that attribute has the
  	// effect of setting property, return the value that it sets property to."
  	if (element.style[property] != "") {
  		return element.style[property];
  	}
  
  	// "If element is a font element that has an attribute whose effect is
  	// to create a presentational hint for property, return the value that the
  	// hint sets property to.  (For a size of 7, this will be the non-CSS value
  	// "xxx-large".)"
  	if (isHtmlNamespace(element.namespaceURI)
  	&& element.tagName == "FONT") {
  		if (property == "color" && element.hasAttribute("color")) {
  			return element.color;
  		}
  		if (property == "fontFamily" && element.hasAttribute("face")) {
  			return element.face;
  		}
  		if (property == "fontSize" && element.hasAttribute("size")) {
  			// This is not even close to correct in general.
  			var size = parseInt(element.size);
  			if (size < 1) {
  				size = 1;
  			}
  			if (size > 7) {
  				size = 7;
  			}
  			return {
  				1: "xx-small",
  				2: "small",
  				3: "medium",
  				4: "large",
  				5: "x-large",
  				6: "xx-large",
  				7: "xxx-large"
  			}[size];
  		}
  	}
  
  	// "If element is in the following list, and property is equal to the
  	// CSS property name listed for it, return the string listed for it."
  	//
  	// A list follows, whose meaning is copied here.
  	if (property == "fontWeight"
  	&& (element.tagName == "B" || element.tagName == "STRONG")) {
  		return "bold";
  	}
  	if (property == "fontStyle"
  	&& (element.tagName == "I" || element.tagName == "EM")) {
  		return "italic";
  	}
  
  	// "Return null."
  	return null;
  }
  
  function reorderModifiableDescendants(node, command, newValue) {
  	// "Let candidate equal node."
  	var candidate = node;
  
  	// "While candidate is a modifiable element, and candidate has exactly one
  	// child, and that child is also a modifiable element, and candidate is not
  	// a simple modifiable element or candidate's specified command value for
  	// command is not equivalent to new value, set candidate to its child."
  	while (isModifiableElement(candidate)
  	&& candidate.childNodes.length == 1
  	&& isModifiableElement(candidate.firstChild)
  	&& (!isSimpleModifiableElement(candidate)
  	|| !areEquivalentValues(command, getSpecifiedCommandValue(candidate, command), newValue))) {
  		candidate = candidate.firstChild;
  	}
  
  	// "If candidate is node, or is not a simple modifiable element, or its
  	// specified command value is not equivalent to new value, or its effective
  	// command value is not loosely equivalent to new value, abort these
  	// steps."
  	if (candidate == node
  	|| !isSimpleModifiableElement(candidate)
  	|| !areEquivalentValues(command, getSpecifiedCommandValue(candidate, command), newValue)
  	|| !areLooselyEquivalentValues(command, getEffectiveCommandValue(candidate, command), newValue)) {
  		return;
  	}
  
  	// "While candidate has children, insert the first child of candidate into
  	// candidate's parent immediately before candidate, preserving ranges."
  	while (candidate.hasChildNodes()) {
  		movePreservingRanges(candidate.firstChild, candidate.parentNode, getNodeIndex(candidate));
  	}
  
  	// "Insert candidate into node's parent immediately after node."
  	node.parentNode.insertBefore(candidate, node.nextSibling);
  
  	// "Append the node as the last child of candidate, preserving ranges."
  	movePreservingRanges(node, candidate, -1);
  }
  
  function recordValues(nodeList) {
  	// "Let values be a list of (node, command, specified command value)
  	// triples, initially empty."
  	var values = [];
  
  	// "For each node in node list, for each command in the list "subscript",
  	// "bold", "fontName", "fontSize", "foreColor", "hiliteColor", "italic",
  	// "strikethrough", and "underline" in that order:"
  	nodeList.forEach(function(node) {
  		["subscript", "bold", "fontname", "fontsize", "forecolor",
  		"hilitecolor", "italic", "strikethrough", "underline"].forEach(function(command) {
  			// "Let ancestor equal node."
  			var ancestor = node;
  
  			// "If ancestor is not an Element, set it to its parent."
  			if (ancestor.nodeType != Node.ELEMENT_NODE) {
  				ancestor = ancestor.parentNode;
  			}
  
  			// "While ancestor is an Element and its specified command value
  			// for command is null, set it to its parent."
  			while (ancestor
  			&& ancestor.nodeType == Node.ELEMENT_NODE
  			&& getSpecifiedCommandValue(ancestor, command) === null) {
  				ancestor = ancestor.parentNode;
  			}
  
  			// "If ancestor is an Element, add (node, command, ancestor's
  			// specified command value for command) to values. Otherwise add
  			// (node, command, null) to values."
  			if (ancestor && ancestor.nodeType == Node.ELEMENT_NODE) {
  				values.push([node, command, getSpecifiedCommandValue(ancestor, command)]);
  			} else {
  				values.push([node, command, null]);
  			}
  		});
  	});
  
  	// "Return values."
  	return values;
  }
  
  function restoreValues(values) {
  	// "For each (node, command, value) triple in values:"
  	values.forEach(function(triple) {
  		var node = triple[0];
  		var command = triple[1];
  		var value = triple[2];
  
  		// "Let ancestor equal node."
  		var ancestor = node;
  
  		// "If ancestor is not an Element, set it to its parent."
  		if (!ancestor || ancestor.nodeType != Node.ELEMENT_NODE) {
  			ancestor = ancestor.parentNode;
  		}
  
  		// "While ancestor is an Element and its specified command value for
  		// command is null, set it to its parent."
  		while (ancestor
  		&& ancestor.nodeType == Node.ELEMENT_NODE
  		&& getSpecifiedCommandValue(ancestor, command) === null) {
  			ancestor = ancestor.parentNode;
  		}
  
  		// "If value is null and ancestor is an Element, push down values on
  		// node for command, with new value null."
  		if (value === null
  		&& ancestor
  		&& ancestor.nodeType == Node.ELEMENT_NODE) {
  			pushDownValues(node, command, null);
  
  		// "Otherwise, if ancestor is an Element and its specified command
  		// value for command is not equivalent to value, or if ancestor is not
  		// an Element and value is not null, force the value of command to
  		// value on node."
  		} else if ((ancestor
  		&& ancestor.nodeType == Node.ELEMENT_NODE
  		&& !areEquivalentValues(command, getSpecifiedCommandValue(ancestor, command), value))
  		|| ((!ancestor || ancestor.nodeType != Node.ELEMENT_NODE)
  		&& value !== null)) {
  			forceValue(node, command, value);
  		}
  	});
  }
  
  
  //@}
  ///// Clearing an element's value /////
  //@{
  
  function clearValue(element, command) {
  	// "If element is not editable, return the empty list."
  	if (!isEditable(element)) {
  		return [];
  	}
  
  	// "If element's specified command value for command is null, return the
  	// empty list."
  	if (getSpecifiedCommandValue(element, command) === null) {
  		return [];
  	}
  
  	// "If element is a simple modifiable element:"
  	if (isSimpleModifiableElement(element)) {
  		// "Let children be the children of element."
  		var children = Array.prototype.slice.call(element.childNodes);
  
  		// "For each child in children, insert child into element's parent
  		// immediately before element, preserving ranges."
  		for (var i = 0; i < children.length; i++) {
  			movePreservingRanges(children[i], element.parentNode, getNodeIndex(element));
  		}
  
  		// "Remove element from its parent."
  		element.parentNode.removeChild(element);
  
  		// "Return children."
  		return children;
  	}
  
  	// "If command is "strikethrough", and element has a style attribute that
  	// sets "text-decoration" to some value containing "line-through", delete
  	// "line-through" from the value."
  	if (command == "strikethrough"
  	&& element.style.textDecoration.indexOf("line-through") != -1) {
  		if (element.style.textDecoration == "line-through") {
  			element.style.textDecoration = "";
  		} else {
  			element.style.textDecoration = element.style.textDecoration.replace("line-through", "");
  		}
  		if (element.getAttribute("style") == "") {
  			element.removeAttribute("style");
  		}
  	}
  
  	// "If command is "underline", and element has a style attribute that sets
  	// "text-decoration" to some value containing "underline", delete
  	// "underline" from the value."
  	if (command == "underline"
  	&& element.style.textDecoration.indexOf("underline") != -1) {
  		if (element.style.textDecoration == "underline") {
  			element.style.textDecoration = "";
  		} else {
  			element.style.textDecoration = element.style.textDecoration.replace("underline", "");
  		}
  		if (element.getAttribute("style") == "") {
  			element.removeAttribute("style");
  		}
  	}
  
  	// "If the relevant CSS property for command is not null, unset the CSS
  	// property property of element."
  	if (commands[command].relevantCssProperty !== null) {
  		element.style[commands[command].relevantCssProperty] = '';
  		if (element.getAttribute("style") == "") {
  			element.removeAttribute("style");
  		}
  	}
  
  	// "If element is a font element:"
  	if (isHtmlNamespace(element.namespaceURI) && element.tagName == "FONT") {
  		// "If command is "foreColor", unset element's color attribute, if set."
  		if (command == "forecolor") {
  			element.removeAttribute("color");
  		}
  
  		// "If command is "fontName", unset element's face attribute, if set."
  		if (command == "fontname") {
  			element.removeAttribute("face");
  		}
  
  		// "If command is "fontSize", unset element's size attribute, if set."
  		if (command == "fontsize") {
  			element.removeAttribute("size");
  		}
  	}
  
  	// "If element is an a element and command is "createLink" or "unlink",
  	// unset the href property of element."
  	if (isHtmlElement(element, "A")
  	&& (command == "createlink" || command == "unlink")) {
  		element.removeAttribute("href");
  	}
  
  	// "If element's specified command value for command is null, return the
  	// empty list."
  	if (getSpecifiedCommandValue(element, command) === null) {
  		return [];
  	}
  
  	// "Set the tag name of element to "span", and return the one-node list
  	// consisting of the result."
  	return [setTagName(element, "span")];
  }
  
  
  //@}
  ///// Pushing down values /////
  //@{
  
  function pushDownValues(node, command, newValue) {
  	// "If node's parent is not an Element, abort this algorithm."
  	if (!node.parentNode
  	|| node.parentNode.nodeType != Node.ELEMENT_NODE) {
  		return;
  	}
  
  	// "If the effective command value of command is loosely equivalent to new
  	// value on node, abort this algorithm."
  	if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
  		return;
  	}
  
  	// "Let current ancestor be node's parent."
  	var currentAncestor = node.parentNode;
  
  	// "Let ancestor list be a list of Nodes, initially empty."
  	var ancestorList = [];
  
  	// "While current ancestor is an editable Element and the effective command
  	// value of command is not loosely equivalent to new value on it, append
  	// current ancestor to ancestor list, then set current ancestor to its
  	// parent."
  	while (isEditable(currentAncestor)
  	&& currentAncestor.nodeType == Node.ELEMENT_NODE
  	&& !areLooselyEquivalentValues(command, getEffectiveCommandValue(currentAncestor, command), newValue)) {
  		ancestorList.push(currentAncestor);
  		currentAncestor = currentAncestor.parentNode;
  	}
  
  	// "If ancestor list is empty, abort this algorithm."
  	if (!ancestorList.length) {
  		return;
  	}
  
  	// "Let propagated value be the specified command value of command on the
  	// last member of ancestor list."
  	var propagatedValue = getSpecifiedCommandValue(ancestorList[ancestorList.length - 1], command);
  
  	// "If propagated value is null and is not equal to new value, abort this
  	// algorithm."
  	if (propagatedValue === null && propagatedValue != newValue) {
  		return;
  	}
  
  	// "If the effective command value for the parent of the last member of
  	// ancestor list is not loosely equivalent to new value, and new value is
  	// not null, abort this algorithm."
  	if (newValue !== null
  	&& !areLooselyEquivalentValues(command, getEffectiveCommandValue(ancestorList[ancestorList.length - 1].parentNode, command), newValue)) {
  		return;
  	}
  
  	// "While ancestor list is not empty:"
  	while (ancestorList.length) {
  		// "Let current ancestor be the last member of ancestor list."
  		// "Remove the last member from ancestor list."
  		var currentAncestor = ancestorList.pop();
  
  		// "If the specified command value of current ancestor for command is
  		// not null, set propagated value to that value."
  		if (getSpecifiedCommandValue(currentAncestor, command) !== null) {
  			propagatedValue = getSpecifiedCommandValue(currentAncestor, command);
  		}
  
  		// "Let children be the children of current ancestor."
  		var children = Array.prototype.slice.call(currentAncestor.childNodes);
  
  		// "If the specified command value of current ancestor for command is
  		// not null, clear the value of current ancestor."
  		if (getSpecifiedCommandValue(currentAncestor, command) !== null) {
  			clearValue(currentAncestor, command);
  		}
  
  		// "For every child in children:"
  		for (var i = 0; i < children.length; i++) {
  			var child = children[i];
  
  			// "If child is node, continue with the next child."
  			if (child == node) {
  				continue;
  			}
  
  			// "If child is an Element whose specified command value for
  			// command is neither null nor equivalent to propagated value,
  			// continue with the next child."
  			if (child.nodeType == Node.ELEMENT_NODE
  			&& getSpecifiedCommandValue(child, command) !== null
  			&& !areEquivalentValues(command, propagatedValue, getSpecifiedCommandValue(child, command))) {
  				continue;
  			}
  
  			// "If child is the last member of ancestor list, continue with the
  			// next child."
  			if (child == ancestorList[ancestorList.length - 1]) {
  				continue;
  			}
  
  			// "Force the value of child, with command as in this algorithm
  			// and new value equal to propagated value."
  			forceValue(child, command, propagatedValue);
  		}
  	}
  }
  
  
  //@}
  ///// Forcing the value of a node /////
  //@{
  
  function forceValue(node, command, newValue) {
  	// "If node's parent is null, abort this algorithm."
  	if (!node.parentNode) {
  		return;
  	}
  
  	// "If new value is null, abort this algorithm."
  	if (newValue === null) {
  		return;
  	}
  
  	// "If node is an allowed child of "span":"
  	if (isAllowedChild(node, "span")) {
  		// "Reorder modifiable descendants of node's previousSibling."
  		reorderModifiableDescendants(node.previousSibling, command, newValue);
  
  		// "Reorder modifiable descendants of node's nextSibling."
  		reorderModifiableDescendants(node.nextSibling, command, newValue);
  
  		// "Wrap the one-node list consisting of node, with sibling criteria
  		// returning true for a simple modifiable element whose specified
  		// command value is equivalent to new value and whose effective command
  		// value is loosely equivalent to new value and false otherwise, and
  		// with new parent instructions returning null."
  		wrap([node],
  			function(node) {
  				return isSimpleModifiableElement(node)
  					&& areEquivalentValues(command, getSpecifiedCommandValue(node, command), newValue)
  					&& areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue);
  			},
  			function() { return null }
  		);
  	}
  
  	// "If node is invisible, abort this algorithm."
  	if (isInvisible(node)) {
  		return;
  	}
  
  	// "If the effective command value of command is loosely equivalent to new
  	// value on node, abort this algorithm."
  	if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
  		return;
  	}
  
  	// "If node is not an allowed child of "span":"
  	if (!isAllowedChild(node, "span")) {
  		// "Let children be all children of node, omitting any that are
  		// Elements whose specified command value for command is neither null
  		// nor equivalent to new value."
  		var children = [];
  		for (var i = 0; i < node.childNodes.length; i++) {
  			if (node.childNodes[i].nodeType == Node.ELEMENT_NODE) {
  				var specifiedValue = getSpecifiedCommandValue(node.childNodes[i], command);
  
  				if (specifiedValue !== null
  				&& !areEquivalentValues(command, newValue, specifiedValue)) {
  					continue;
  				}
  			}
  			children.push(node.childNodes[i]);
  		}
  
  		// "Force the value of each Node in children, with command and new
  		// value as in this invocation of the algorithm."
  		for (var i = 0; i < children.length; i++) {
  			forceValue(children[i], command, newValue);
  		}
  
  		// "Abort this algorithm."
  		return;
  	}
  
  	// "If the effective command value of command is loosely equivalent to new
  	// value on node, abort this algorithm."
  	if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
  		return;
  	}
  
  	// "Let new parent be null."
  	var newParent = null;
  
  	// "If the CSS styling flag is false:"
  	if (!cssStylingFlag) {
  		// "If command is "bold" and new value is "bold", let new parent be the
  		// result of calling createElement("b") on the ownerDocument of node."
  		if (command == "bold" && (newValue == "bold" || newValue == "700")) {
  			newParent = node.ownerDocument.createElement("b");
  		}
  
  		// "If command is "italic" and new value is "italic", let new parent be
  		// the result of calling createElement("i") on the ownerDocument of
  		// node."
  		if (command == "italic" && newValue == "italic") {
  			newParent = node.ownerDocument.createElement("i");
  		}
  
  		// "If command is "strikethrough" and new value is "line-through", let
  		// new parent be the result of calling createElement("s") on the
  		// ownerDocument of node."
  		if (command == "strikethrough" && newValue == "line-through") {
  			newParent = node.ownerDocument.createElement("s");
  		}
  
  		// "If command is "underline" and new value is "underline", let new
  		// parent be the result of calling createElement("u") on the
  		// ownerDocument of node."
  		if (command == "underline" && newValue == "underline") {
  			newParent = node.ownerDocument.createElement("u");
  		}
  
  		// "If command is "foreColor", and new value is fully opaque with red,
  		// green, and blue components in the range 0 to 255:"
  		if (command == "forecolor" && parseSimpleColor(newValue)) {
  			// "Let new parent be the result of calling createElement("font")
  			// on the ownerDocument of node."
  			newParent = node.ownerDocument.createElement("font");
  
  			// "Set the color attribute of new parent to the result of applying
  			// the rules for serializing simple color values to new value
  			// (interpreted as a simple color)."
  			newParent.setAttribute("color", parseSimpleColor(newValue));
  		}
  
  		// "If command is "fontName", let new parent be the result of calling
  		// createElement("font") on the ownerDocument of node, then set the
  		// face attribute of new parent to new value."
  		if (command == "fontname") {
  			newParent = node.ownerDocument.createElement("font");
  			newParent.face = newValue;
  		}
  	}
  
  	// "If command is "createLink" or "unlink":"
  	if (command == "createlink" || command == "unlink") {
  		// "Let new parent be the result of calling createElement("a") on the
  		// ownerDocument of node."
  		newParent = node.ownerDocument.createElement("a");
  
  		// "Set the href attribute of new parent to new value."
  		newParent.setAttribute("href", newValue);
  
  		// "Let ancestor be node's parent."
  		var ancestor = node.parentNode;
  
  		// "While ancestor is not null:"
  		while (ancestor) {
  			// "If ancestor is an a, set the tag name of ancestor to "span",
  			// and let ancestor be the result."
  			if (isHtmlElement(ancestor, "A")) {
  				ancestor = setTagName(ancestor, "span");
  			}
  
  			// "Set ancestor to its parent."
  			ancestor = ancestor.parentNode;
  		}
  	}
  
  	// "If command is "fontSize"; and new value is one of "xx-small", "small",
  	// "medium", "large", "x-large", "xx-large", or "xxx-large"; and either the
  	// CSS styling flag is false, or new value is "xxx-large": let new parent
  	// be the result of calling createElement("font") on the ownerDocument of
  	// node, then set the size attribute of new parent to the number from the
  	// following table based on new value: [table omitted]"
  	if (command == "fontsize"
  	&& ["xx-small", "small", "medium", "large", "x-large", "xx-large", "xxx-large"].indexOf(newValue) != -1
  	&& (!cssStylingFlag || newValue == "xxx-large")) {
  		newParent = node.ownerDocument.createElement("font");
  		newParent.size = cssSizeToLegacy(newValue);
  	}
  
  	// "If command is "subscript" or "superscript" and new value is
  	// "subscript", let new parent be the result of calling
  	// createElement("sub") on the ownerDocument of node."
  	if ((command == "subscript" || command == "superscript")
  	&& newValue == "subscript") {
  		newParent = node.ownerDocument.createElement("sub");
  	}
  
  	// "If command is "subscript" or "superscript" and new value is
  	// "superscript", let new parent be the result of calling
  	// createElement("sup") on the ownerDocument of node."
  	if ((command == "subscript" || command == "superscript")
  	&& newValue == "superscript") {
  		newParent = node.ownerDocument.createElement("sup");
  	}
  
  	// "If new parent is null, let new parent be the result of calling
  	// createElement("span") on the ownerDocument of node."
  	if (!newParent) {
  		newParent = node.ownerDocument.createElement("span");
  	}
  
  	// "Insert new parent in node's parent before node."
  	node.parentNode.insertBefore(newParent, node);
  
  	// "If the effective command value of command for new parent is not loosely
  	// equivalent to new value, and the relevant CSS property for command is
  	// not null, set that CSS property of new parent to new value (if the new
  	// value would be valid)."
  	var property = commands[command].relevantCssProperty;
  	if (property !== null
  	&& !areLooselyEquivalentValues(command, getEffectiveCommandValue(newParent, command), newValue)) {
  		newParent.style[property] = newValue;
  	}
  
  	// "If command is "strikethrough", and new value is "line-through", and the
  	// effective command value of "strikethrough" for new parent is not
  	// "line-through", set the "text-decoration" property of new parent to
  	// "line-through"."
  	if (command == "strikethrough"
  	&& newValue == "line-through"
  	&& getEffectiveCommandValue(newParent, "strikethrough") != "line-through") {
  		newParent.style.textDecoration = "line-through";
  	}
  
  	// "If command is "underline", and new value is "underline", and the
  	// effective command value of "underline" for new parent is not
  	// "underline", set the "text-decoration" property of new parent to
  	// "underline"."
  	if (command == "underline"
  	&& newValue == "underline"
  	&& getEffectiveCommandValue(newParent, "underline") != "underline") {
  		newParent.style.textDecoration = "underline";
  	}
  
  	// "Append node to new parent as its last child, preserving ranges."
  	movePreservingRanges(node, newParent, newParent.childNodes.length);
  
  	// "If node is an Element and the effective command value of command for
  	// node is not loosely equivalent to new value:"
  	if (node.nodeType == Node.ELEMENT_NODE
  	&& !areEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
  		// "Insert node into the parent of new parent before new parent,
  		// preserving ranges."
  		movePreservingRanges(node, newParent.parentNode, getNodeIndex(newParent));
  
  		// "Remove new parent from its parent."
  		newParent.parentNode.removeChild(newParent);
  
  		// "Let children be all children of node, omitting any that are
  		// Elements whose specified command value for command is neither null
  		// nor equivalent to new value."
  		var children = [];
  		for (var i = 0; i < node.childNodes.length; i++) {
  			if (node.childNodes[i].nodeType == Node.ELEMENT_NODE) {
  				var specifiedValue = getSpecifiedCommandValue(node.childNodes[i], command);
  
  				if (specifiedValue !== null
  				&& !areEquivalentValues(command, newValue, specifiedValue)) {
  					continue;
  				}
  			}
  			children.push(node.childNodes[i]);
  		}
  
  		// "Force the value of each Node in children, with command and new
  		// value as in this invocation of the algorithm."
  		for (var i = 0; i < children.length; i++) {
  			forceValue(children[i], command, newValue);
  		}
  	}
  }
  
  
  //@}
  ///// Setting the selection's value /////
  //@{
  
  function setSelectionValue(command, newValue) {
  	// "If there is no formattable node effectively contained in the active
  	// range:"
  	if (!getAllEffectivelyContainedNodes(getActiveRange())
  	.some(isFormattableNode)) {
  		// "If command has inline command activated values, set the state
  		// override to true if new value is among them and false if it's not."
  		if ("inlineCommandActivatedValues" in commands[command]) {
  			setStateOverride(command, commands[command].inlineCommandActivatedValues
  				.indexOf(newValue) != -1);
  		}
  
  		// "If command is "subscript", unset the state override for
  		// "superscript"."
  		if (command == "subscript") {
  			unsetStateOverride("superscript");
  		}
  
  		// "If command is "superscript", unset the state override for
  		// "subscript"."
  		if (command == "superscript") {
  			unsetStateOverride("subscript");
  		}
  
  		// "If new value is null, unset the value override (if any)."
  		if (newValue === null) {
  			unsetValueOverride(command);
  
  		// "Otherwise, if command is "createLink" or it has a value specified,
  		// set the value override to new value."
  		} else if (command == "createlink" || "value" in commands[command]) {
  			setValueOverride(command, newValue);
  		}
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "If the active range's start node is an editable Text node, and its
  	// start offset is neither zero nor its start node's length, call
  	// splitText() on the active range's start node, with argument equal to the
  	// active range's start offset. Then set the active range's start node to
  	// the result, and its start offset to zero."
  	if (isEditable(getActiveRange().startContainer)
  	&& getActiveRange().startContainer.nodeType == Node.TEXT_NODE
  	&& getActiveRange().startOffset != 0
  	&& getActiveRange().startOffset != getNodeLength(getActiveRange().startContainer)) {
  		// Account for browsers not following range mutation rules
  		var newActiveRange = document.createRange();
  		var newNode;
  		if (getActiveRange().startContainer == getActiveRange().endContainer) {
  			var newEndOffset = getActiveRange().endOffset - getActiveRange().startOffset;
  			newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
  			newActiveRange.setEnd(newNode, newEndOffset);
  			getActiveRange().setEnd(newNode, newEndOffset);
  		} else {
  			newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
  		}
  		newActiveRange.setStart(newNode, 0);
  		getSelection().removeAllRanges();
  		getSelection().addRange(newActiveRange);
  
  		getActiveRange().setStart(newNode, 0);
  	}
  
  	// "If the active range's end node is an editable Text node, and its end
  	// offset is neither zero nor its end node's length, call splitText() on
  	// the active range's end node, with argument equal to the active range's
  	// end offset."
  	if (isEditable(getActiveRange().endContainer)
  	&& getActiveRange().endContainer.nodeType == Node.TEXT_NODE
  	&& getActiveRange().endOffset != 0
  	&& getActiveRange().endOffset != getNodeLength(getActiveRange().endContainer)) {
  		// IE seems to mutate the range incorrectly here, so we need correction
  		// here as well.  The active range will be temporarily in orphaned
  		// nodes, so calling getActiveRange() after splitText() but before
  		// fixing the range will throw an exception.
  		var activeRange = getActiveRange();
  		var newStart = [activeRange.startContainer, activeRange.startOffset];
  		var newEnd = [activeRange.endContainer, activeRange.endOffset];
  		activeRange.endContainer.splitText(activeRange.endOffset);
  		activeRange.setStart(newStart[0], newStart[1]);
  		activeRange.setEnd(newEnd[0], newEnd[1]);
  
  		getSelection().removeAllRanges();
  		getSelection().addRange(activeRange);
  	}
  
  	// "Let element list be all editable Elements effectively contained in the
  	// active range.
  	//
  	// "For each element in element list, clear the value of element."
  	getAllEffectivelyContainedNodes(getActiveRange(), function(node) {
  		return isEditable(node) && node.nodeType == Node.ELEMENT_NODE;
  	}).forEach(function(element) {
  		clearValue(element, command);
  	});
  
  	// "Let node list be all editable nodes effectively contained in the active
  	// range.
  	//
  	// "For each node in node list:"
  	getAllEffectivelyContainedNodes(getActiveRange(), isEditable).forEach(function(node) {
  		// "Push down values on node."
  		pushDownValues(node, command, newValue);
  
  		// "If node is an allowed child of span, force the value of node."
  		if (isAllowedChild(node, "span")) {
  			forceValue(node, command, newValue);
  		}
  	});
  }
  
  
  //@}
  ///// The backColor command /////
  //@{
  commands.backcolor = {
  	// Copy-pasted, same as hiliteColor
  	action: function(value) {
  		// Action is further copy-pasted, same as foreColor
  
  		// "If value is not a valid CSS color, prepend "#" to it."
  		//
  		// "If value is still not a valid CSS color, or if it is currentColor,
  		// abort these steps and do nothing."
  		//
  		// Cheap hack for testing, no attempt to be comprehensive.
  		if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
  			value = "#" + value;
  		}
  		if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
  		&& !parseSimpleColor(value)
  		&& value.toLowerCase() != "transparent") {
  			return;
  		}
  
  		// "Set the selection's value to value."
  		setSelectionValue("backcolor", value);
  	}, standardInlineValueCommand: true, relevantCssProperty: "backgroundColor",
  	equivalentValues: function(val1, val2) {
  		// "Either both strings are valid CSS colors and have the same red,
  		// green, blue, and alpha components, or neither string is a valid CSS
  		// color."
  		return normalizeColor(val1) === normalizeColor(val2);
  	},
  };
  
  //@}
  ///// The bold command /////
  //@{
  commands.bold = {
  	action: function() {
  		// "If queryCommandState("bold") returns true, set the selection's
  		// value to "normal". Otherwise set the selection's value to "bold"."
  		if (myQueryCommandState("bold")) {
  			setSelectionValue("bold", "normal");
  		} else {
  			setSelectionValue("bold", "bold");
  		}
  	}, inlineCommandActivatedValues: ["bold", "600", "700", "800", "900"],
  	relevantCssProperty: "fontWeight",
  	equivalentValues: function(val1, val2) {
  		// "Either the two strings are equal, or one is "bold" and the other is
  		// "700", or one is "normal" and the other is "400"."
  		return val1 == val2
  			|| (val1 == "bold" && val2 == "700")
  			|| (val1 == "700" && val2 == "bold")
  			|| (val1 == "normal" && val2 == "400")
  			|| (val1 == "400" && val2 == "normal");
  	},
  };
  
  //@}
  ///// The createLink command /////
  //@{
  commands.createlink = {
  	action: function(value) {
  		// "If value is the empty string, abort these steps and do nothing."
  		if (value === "") {
  			return;
  		}
  
  		// "For each editable a element that has an href attribute and is an
  		// ancestor of some node effectively contained in the active range, set
  		// that a element's href attribute to value."
  		//
  		// TODO: We don't actually do this in tree order, not that it matters
  		// unless you're spying with mutation events.
  		getAllEffectivelyContainedNodes(getActiveRange()).forEach(function(node) {
  			getAncestors(node).forEach(function(ancestor) {
  				if (isEditable(ancestor)
  				&& isHtmlElement(ancestor, "a")
  				&& ancestor.hasAttribute("href")) {
  					ancestor.setAttribute("href", value);
  				}
  			});
  		});
  
  		// "Set the selection's value to value."
  		setSelectionValue("createlink", value);
  	}
  };
  
  //@}
  ///// The fontName command /////
  //@{
  commands.fontname = {
  	action: function(value) {
  		// "Set the selection's value to value."
  		setSelectionValue("fontname", value);
  	}, standardInlineValueCommand: true, relevantCssProperty: "fontFamily"
  };
  
  //@}
  ///// The fontSize command /////
  //@{
  
  // Helper function for fontSize's action plus queryOutputHelper.  It's just the
  // middle of fontSize's action, ripped out into its own function.  Returns null
  // if the size is invalid.
  function normalizeFontSize(value) {
  	// "Strip leading and trailing whitespace from value."
  	//
  	// Cheap hack, not following the actual algorithm.
  	value = value.trim();
  
  	// "If value is not a valid floating point number, and would not be a valid
  	// floating point number if a single leading "+" character were stripped,
  	// abort these steps and do nothing."
  	if (!/^[-+]?[0-9]+(\.[0-9]+)?([eE][-+]?[0-9]+)?$/.test(value)) {
  		return null;
  	}
  
  	var mode;
  
  	// "If the first character of value is "+", delete the character and let
  	// mode be "relative-plus"."
  	if (value[0] == "+") {
  		value = value.slice(1);
  		mode = "relative-plus";
  	// "Otherwise, if the first character of value is "-", delete the character
  	// and let mode be "relative-minus"."
  	} else if (value[0] == "-") {
  		value = value.slice(1);
  		mode = "relative-minus";
  	// "Otherwise, let mode be "absolute"."
  	} else {
  		mode = "absolute";
  	}
  
  	// "Apply the rules for parsing non-negative integers to value, and let
  	// number be the result."
  	//
  	// Another cheap hack.
  	var num = parseInt(value);
  
  	// "If mode is "relative-plus", add three to number."
  	if (mode == "relative-plus") {
  		num += 3;
  	}
  
  	// "If mode is "relative-minus", negate number, then add three to it."
  	if (mode == "relative-minus") {
  		num = 3 - num;
  	}
  
  	// "If number is less than one, let number equal 1."
  	if (num < 1) {
  		num = 1;
  	}
  
  	// "If number is greater than seven, let number equal 7."
  	if (num > 7) {
  		num = 7;
  	}
  
  	// "Set value to the string here corresponding to number:" [table omitted]
  	value = {
  		1: "xx-small",
  		2: "small",
  		3: "medium",
  		4: "large",
  		5: "x-large",
  		6: "xx-large",
  		7: "xxx-large"
  	}[num];
  
  	return value;
  }
  
  commands.fontsize = {
  	action: function(value) {
  		value = normalizeFontSize(value);
  		if (value === null) {
  			return;
  		}
  
  		// "Set the selection's value to value."
  		setSelectionValue("fontsize", value);
  	}, indeterm: function() {
  		// "True if among formattable nodes that are effectively contained in
  		// the active range, there are two that have distinct effective command
  		// values.  Otherwise false."
  		return getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)
  		.map(function(node) {
  			return getEffectiveCommandValue(node, "fontsize");
  		}).filter(function(value, i, arr) {
  			return arr.slice(0, i).indexOf(value) == -1;
  		}).length >= 2;
  	}, value: function() {
  		// "If the active range is null, return the empty string."
  		if (!getActiveRange()) {
  			return "";
  		}
  
  		// "Let pixel size be the effective command value of the first
  		// formattable node that is effectively contained in the active range,
  		// or if there is no such node, the effective command value of the
  		// active range's start node, in either case interpreted as a number of
  		// pixels."
  		var node = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)[0];
  		if (node === undefined) {
  			node = getActiveRange().startContainer;
  		}
  		var pixelSize = getEffectiveCommandValue(node, "fontsize");
  
  		// "Return the legacy font size for pixel size."
  		return getLegacyFontSize(pixelSize);
  	}, relevantCssProperty: "fontSize"
  };
  
  function getLegacyFontSize(size) {
  	if (getLegacyFontSize.resultCache === undefined) {
  		getLegacyFontSize.resultCache = {};
  	}
  
  	if (getLegacyFontSize.resultCache[size] !== undefined) {
  		return getLegacyFontSize.resultCache[size];
  	}
  
  	// For convenience in other places in my code, I handle all sizes, not just
  	// pixel sizes as the spec says.  This means pixel sizes have to be passed
  	// in suffixed with "px", not as plain numbers.
  	if (normalizeFontSize(size) !== null) {
  		return getLegacyFontSize.resultCache[size] = cssSizeToLegacy(normalizeFontSize(size));
  	}
  
  	if (["xx-small", "x-small", "small", "medium", "large", "x-large", "xx-large", "xxx-large"].indexOf(size) == -1
  	&& !/^[0-9]+(\.[0-9]+)?(cm|mm|in|pt|pc|px)$/.test(size)) {
  		// There is no sensible legacy size for things like "2em".
  		return getLegacyFontSize.resultCache[size] = null;
  	}
  
  	var font = document.createElement("font");
  	document.body.appendChild(font);
  	if (size == "xxx-large") {
  		font.size = 7;
  	} else {
  		font.style.fontSize = size;
  	}
  	var pixelSize = parseInt(getComputedStyle(font).fontSize);
  	document.body.removeChild(font);
  
  	// "Let returned size be 1."
  	var returnedSize = 1;
  
  	// "While returned size is less than 7:"
  	while (returnedSize < 7) {
  		// "Let lower bound be the resolved value of "font-size" in pixels
  		// of a font element whose size attribute is set to returned size."
  		var font = document.createElement("font");
  		font.size = returnedSize;
  		document.body.appendChild(font);
  		var lowerBound = parseInt(getComputedStyle(font).fontSize);
  
  		// "Let upper bound be the resolved value of "font-size" in pixels
  		// of a font element whose size attribute is set to one plus
  		// returned size."
  		font.size = 1 + returnedSize;
  		var upperBound = parseInt(getComputedStyle(font).fontSize);
  		document.body.removeChild(font);
  
  		// "Let average be the average of upper bound and lower bound."
  		var average = (upperBound + lowerBound)/2;
  
  		// "If pixel size is less than average, return the one-element
  		// string consisting of the digit returned size."
  		if (pixelSize < average) {
  			return getLegacyFontSize.resultCache[size] = String(returnedSize);
  		}
  
  		// "Add one to returned size."
  		returnedSize++;
  	}
  
  	// "Return "7"."
  	return getLegacyFontSize.resultCache[size] = "7";
  }
  
  //@}
  ///// The foreColor command /////
  //@{
  commands.forecolor = {
  	action: function(value) {
  		// Copy-pasted, same as backColor and hiliteColor
  
  		// "If value is not a valid CSS color, prepend "#" to it."
  		//
  		// "If value is still not a valid CSS color, or if it is currentColor,
  		// abort these steps and do nothing."
  		//
  		// Cheap hack for testing, no attempt to be comprehensive.
  		if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
  			value = "#" + value;
  		}
  		if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
  		&& !parseSimpleColor(value)
  		&& value.toLowerCase() != "transparent") {
  			return;
  		}
  
  		// "Set the selection's value to value."
  		setSelectionValue("forecolor", value);
  	}, standardInlineValueCommand: true, relevantCssProperty: "color",
  	equivalentValues: function(val1, val2) {
  		// "Either both strings are valid CSS colors and have the same red,
  		// green, blue, and alpha components, or neither string is a valid CSS
  		// color."
  		return normalizeColor(val1) === normalizeColor(val2);
  	},
  };
  
  //@}
  ///// The hiliteColor command /////
  //@{
  commands.hilitecolor = {
  	// Copy-pasted, same as backColor
  	action: function(value) {
  		// Action is further copy-pasted, same as foreColor
  
  		// "If value is not a valid CSS color, prepend "#" to it."
  		//
  		// "If value is still not a valid CSS color, or if it is currentColor,
  		// abort these steps and do nothing."
  		//
  		// Cheap hack for testing, no attempt to be comprehensive.
  		if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
  			value = "#" + value;
  		}
  		if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
  		&& !parseSimpleColor(value)
  		&& value.toLowerCase() != "transparent") {
  			return;
  		}
  
  		// "Set the selection's value to value."
  		setSelectionValue("hilitecolor", value);
  	}, indeterm: function() {
  		// "True if among editable Text nodes that are effectively contained in
  		// the active range, there are two that have distinct effective command
  		// values.  Otherwise false."
  		return getAllEffectivelyContainedNodes(getActiveRange(), function(node) {
  			return isEditable(node) && node.nodeType == Node.TEXT_NODE;
  		}).map(function(node) {
  			return getEffectiveCommandValue(node, "hilitecolor");
  		}).filter(function(value, i, arr) {
  			return arr.slice(0, i).indexOf(value) == -1;
  		}).length >= 2;
  	}, standardInlineValueCommand: true, relevantCssProperty: "backgroundColor",
  	equivalentValues: function(val1, val2) {
  		// "Either both strings are valid CSS colors and have the same red,
  		// green, blue, and alpha components, or neither string is a valid CSS
  		// color."
  		return normalizeColor(val1) === normalizeColor(val2);
  	},
  };
  
  //@}
  ///// The italic command /////
  //@{
  commands.italic = {
  	action: function() {
  		// "If queryCommandState("italic") returns true, set the selection's
  		// value to "normal". Otherwise set the selection's value to "italic"."
  		if (myQueryCommandState("italic")) {
  			setSelectionValue("italic", "normal");
  		} else {
  			setSelectionValue("italic", "italic");
  		}
  	}, inlineCommandActivatedValues: ["italic", "oblique"],
  	relevantCssProperty: "fontStyle"
  };
  
  //@}
  ///// The removeFormat command /////
  //@{
  commands.removeformat = {
  	action: function() {
  		// "A removeFormat candidate is an editable HTML element with local
  		// name "abbr", "acronym", "b", "bdi", "bdo", "big", "blink", "cite",
  		// "code", "dfn", "em", "font", "i", "ins", "kbd", "mark", "nobr", "q",
  		// "s", "samp", "small", "span", "strike", "strong", "sub", "sup",
  		// "tt", "u", or "var"."
  		function isRemoveFormatCandidate(node) {
  			return isEditable(node)
  				&& isHtmlElement(node, ["abbr", "acronym", "b", "bdi", "bdo",
  				"big", "blink", "cite", "code", "dfn", "em", "font", "i",
  				"ins", "kbd", "mark", "nobr", "q", "s", "samp", "small",
  				"span", "strike", "strong", "sub", "sup", "tt", "u", "var"]);
  		}
  
  		// "Let elements to remove be a list of every removeFormat candidate
  		// effectively contained in the active range."
  		var elementsToRemove = getAllEffectivelyContainedNodes(getActiveRange(), isRemoveFormatCandidate);
  
  		// "For each element in elements to remove:"
  		elementsToRemove.forEach(function(element) {
  			// "While element has children, insert the first child of element
  			// into the parent of element immediately before element,
  			// preserving ranges."
  			while (element.hasChildNodes()) {
  				movePreservingRanges(element.firstChild, element.parentNode, getNodeIndex(element));
  			}
  
  			// "Remove element from its parent."
  			element.parentNode.removeChild(element);
  		});
  
  		// "If the active range's start node is an editable Text node, and its
  		// start offset is neither zero nor its start node's length, call
  		// splitText() on the active range's start node, with argument equal to
  		// the active range's start offset. Then set the active range's start
  		// node to the result, and its start offset to zero."
  		if (isEditable(getActiveRange().startContainer)
  		&& getActiveRange().startContainer.nodeType == Node.TEXT_NODE
  		&& getActiveRange().startOffset != 0
  		&& getActiveRange().startOffset != getNodeLength(getActiveRange().startContainer)) {
  			// Account for browsers not following range mutation rules
  			if (getActiveRange().startContainer == getActiveRange().endContainer) {
  				var newEnd = getActiveRange().endOffset - getActiveRange().startOffset;
  				var newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
  				getActiveRange().setStart(newNode, 0);
  				getActiveRange().setEnd(newNode, newEnd);
  			} else {
  				getActiveRange().setStart(getActiveRange().startContainer.splitText(getActiveRange().startOffset), 0);
  			}
  		}
  
  		// "If the active range's end node is an editable Text node, and its
  		// end offset is neither zero nor its end node's length, call
  		// splitText() on the active range's end node, with argument equal to
  		// the active range's end offset."
  		if (isEditable(getActiveRange().endContainer)
  		&& getActiveRange().endContainer.nodeType == Node.TEXT_NODE
  		&& getActiveRange().endOffset != 0
  		&& getActiveRange().endOffset != getNodeLength(getActiveRange().endContainer)) {
  			// IE seems to mutate the range incorrectly here, so we need
  			// correction here as well.  Have to be careful to set the range to
  			// something not including the text node so that getActiveRange()
  			// doesn't throw an exception due to a temporarily detached
  			// endpoint.
  			var newStart = [getActiveRange().startContainer, getActiveRange().startOffset];
  			var newEnd = [getActiveRange().endContainer, getActiveRange().endOffset];
  			getActiveRange().setEnd(document.documentElement, 0);
  			newEnd[0].splitText(newEnd[1]);
  			getActiveRange().setStart(newStart[0], newStart[1]);
  			getActiveRange().setEnd(newEnd[0], newEnd[1]);
  		}
  
  		// "Let node list consist of all editable nodes effectively contained
  		// in the active range."
  		//
  		// "For each node in node list, while node's parent is a removeFormat
  		// candidate in the same editing host as node, split the parent of the
  		// one-node list consisting of node."
  		getAllEffectivelyContainedNodes(getActiveRange(), isEditable).forEach(function(node) {
  			while (isRemoveFormatCandidate(node.parentNode)
  			&& inSameEditingHost(node.parentNode, node)) {
  				splitParent([node]);
  			}
  		});
  
  		// "For each of the entries in the following list, in the given order,
  		// set the selection's value to null, with command as given."
  		[
  			"subscript",
  			"bold",
  			"fontname",
  			"fontsize",
  			"forecolor",
  			"hilitecolor",
  			"italic",
  			"strikethrough",
  			"underline",
  		].forEach(function(command) {
  			setSelectionValue(command, null);
  		});
  	}
  };
  
  //@}
  ///// The strikethrough command /////
  //@{
  commands.strikethrough = {
  	action: function() {
  		// "If queryCommandState("strikethrough") returns true, set the
  		// selection's value to null. Otherwise set the selection's value to
  		// "line-through"."
  		if (myQueryCommandState("strikethrough")) {
  			setSelectionValue("strikethrough", null);
  		} else {
  			setSelectionValue("strikethrough", "line-through");
  		}
  	}, inlineCommandActivatedValues: ["line-through"]
  };
  
  //@}
  ///// The subscript command /////
  //@{
  commands.subscript = {
  	action: function() {
  		// "Call queryCommandState("subscript"), and let state be the result."
  		var state = myQueryCommandState("subscript");
  
  		// "Set the selection's value to null."
  		setSelectionValue("subscript", null);
  
  		// "If state is false, set the selection's value to "subscript"."
  		if (!state) {
  			setSelectionValue("subscript", "subscript");
  		}
  	}, indeterm: function() {
  		// "True if either among formattable nodes that are effectively
  		// contained in the active range, there is at least one with effective
  		// command value "subscript" and at least one with some other effective
  		// command value; or if there is some formattable node effectively
  		// contained in the active range with effective command value "mixed".
  		// Otherwise false."
  		var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);
  		return (nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") == "subscript" })
  			&& nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") != "subscript" }))
  			|| nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") == "mixed" });
  	}, inlineCommandActivatedValues: ["subscript"],
  };
  
  //@}
  ///// The superscript command /////
  //@{
  commands.superscript = {
  	action: function() {
  		// "Call queryCommandState("superscript"), and let state be the
  		// result."
  		var state = myQueryCommandState("superscript");
  
  		// "Set the selection's value to null."
  		setSelectionValue("superscript", null);
  
  		// "If state is false, set the selection's value to "superscript"."
  		if (!state) {
  			setSelectionValue("superscript", "superscript");
  		}
  	}, indeterm: function() {
  		// "True if either among formattable nodes that are effectively
  		// contained in the active range, there is at least one with effective
  		// command value "superscript" and at least one with some other
  		// effective command value; or if there is some formattable node
  		// effectively contained in the active range with effective command
  		// value "mixed".  Otherwise false."
  		var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);
  		return (nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") == "superscript" })
  			&& nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") != "superscript" }))
  			|| nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") == "mixed" });
  	}, inlineCommandActivatedValues: ["superscript"],
  };
  
  //@}
  ///// The underline command /////
  //@{
  commands.underline = {
  	action: function() {
  		// "If queryCommandState("underline") returns true, set the selection's
  		// value to null. Otherwise set the selection's value to "underline"."
  		if (myQueryCommandState("underline")) {
  			setSelectionValue("underline", null);
  		} else {
  			setSelectionValue("underline", "underline");
  		}
  	}, inlineCommandActivatedValues: ["underline"]
  };
  
  //@}
  ///// The unlink command /////
  //@{
  commands.unlink = {
  	action: function() {
  		// "Let hyperlinks be a list of every a element that has an href
  		// attribute and is contained in the active range or is an ancestor of
  		// one of its boundary points."
  		//
  		// As usual, take care to ensure it's tree order.  The correctness of
  		// the following is left as an exercise for the reader.
  		var range = getActiveRange();
  		var hyperlinks = [];
  		for (
  			var node = range.startContainer;
  			node;
  			node = node.parentNode
  		) {
  			if (isHtmlElement(node, "A")
  			&& node.hasAttribute("href")) {
  				hyperlinks.unshift(node);
  			}
  		}
  		for (
  			var node = range.startContainer;
  			node != nextNodeDescendants(range.endContainer);
  			node = nextNode(node)
  		) {
  			if (isHtmlElement(node, "A")
  			&& node.hasAttribute("href")
  			&& (isContained(node, range)
  			|| isAncestor(node, range.endContainer)
  			|| node == range.endContainer)) {
  				hyperlinks.push(node);
  			}
  		}
  
  		// "Clear the value of each member of hyperlinks."
  		for (var i = 0; i < hyperlinks.length; i++) {
  			clearValue(hyperlinks[i], "unlink");
  		}
  	}
  };
  
  //@}
  
  /////////////////////////////////////
  ///// Block formatting commands /////
  /////////////////////////////////////
  
  ///// Block formatting command definitions /////
  //@{
  
  // "An indentation element is either a blockquote, or a div that has a style
  // attribute that sets "margin" or some subproperty of it."
  function isIndentationElement(node) {
  	if (!isHtmlElement(node)) {
  		return false;
  	}
  
  	if (node.tagName == "BLOCKQUOTE") {
  		return true;
  	}
  
  	if (node.tagName != "DIV") {
  		return false;
  	}
  
  	for (var i = 0; i < node.style.length; i++) {
  		// Approximate check
  		if (/^(-[a-z]+-)?margin/.test(node.style[i])) {
  			return true;
  		}
  	}
  
  	return false;
  }
  
  // "A simple indentation element is an indentation element that has no
  // attributes except possibly
  //
  //   * "a style attribute that sets no properties other than "margin",
  //     "border", "padding", or subproperties of those; and/or
  //   * "a dir attribute."
  function isSimpleIndentationElement(node) {
  	if (!isIndentationElement(node)) {
  		return false;
  	}
  
  	for (var i = 0; i < node.attributes.length; i++) {
  		if (!isHtmlNamespace(node.attributes[i].namespaceURI)
  		|| ["style", "dir"].indexOf(node.attributes[i].name) == -1) {
  			return false;
  		}
  	}
  
  	for (var i = 0; i < node.style.length; i++) {
  		// This is approximate, but it works well enough for my purposes.
  		if (!/^(-[a-z]+-)?(margin|border|padding)/.test(node.style[i])) {
  			return false;
  		}
  	}
  
  	return true;
  }
  
  // "A non-list single-line container is an HTML element with local name
  // "address", "div", "h1", "h2", "h3", "h4", "h5", "h6", "listing", "p", "pre",
  // or "xmp"."
  function isNonListSingleLineContainer(node) {
  	return isHtmlElement(node, ["address", "div", "h1", "h2", "h3", "h4", "h5",
  		"h6", "listing", "p", "pre", "xmp"]);
  }
  
  // "A single-line container is either a non-list single-line container, or an
  // HTML element with local name "li", "dt", or "dd"."
  function isSingleLineContainer(node) {
  	return isNonListSingleLineContainer(node)
  		|| isHtmlElement(node, ["li", "dt", "dd"]);
  }
  
  function getBlockNodeOf(node) {
  	// "While node is an inline node, set node to its parent."
  	while (isInlineNode(node)) {
  		node = node.parentNode;
  	}
  
  	// "Return node."
  	return node;
  }
  
  //@}
  ///// Assorted block formatting command algorithms /////
  //@{
  
  function fixDisallowedAncestors(node) {
  	// "If node is not editable, abort these steps."
  	if (!isEditable(node)) {
  		return;
  	}
  
  	// "If node is not an allowed child of any of its ancestors in the same
  	// editing host:"
  	if (getAncestors(node).every(function(ancestor) {
  		return !inSameEditingHost(node, ancestor)
  			|| !isAllowedChild(node, ancestor)
  	})) {
  		// "If node is a dd or dt, wrap the one-node list consisting of node,
  		// with sibling criteria returning true for any dl with no attributes
  		// and false otherwise, and new parent instructions returning the
  		// result of calling createElement("dl") on the context object. Then
  		// abort these steps."
  		if (isHtmlElement(node, ["dd", "dt"])) {
  			wrap([node],
  				function(sibling) { return isHtmlElement(sibling, "dl") && !sibling.attributes.length },
  				function() { return document.createElement("dl") });
  			return;
  		}
  
  		// "If "p" is not an allowed child of the editing host of node, abort
  		// these steps."
  		if (!isAllowedChild("p", getEditingHostOf(node))) {
  			return;
  		}
  
  		// "If node is not a prohibited paragraph child, abort these steps."
  		if (!isProhibitedParagraphChild(node)) {
  			return;
  		}
  
  		// "Set the tag name of node to the default single-line container name,
  		// and let node be the result."
  		node = setTagName(node, defaultSingleLineContainerName);
  
  		// "Fix disallowed ancestors of node."
  		fixDisallowedAncestors(node);
  
  		// "Let children be node's children."
  		var children = [].slice.call(node.childNodes);
  
  		// "For each child in children, if child is a prohibited paragraph
  		// child:"
  		children.filter(isProhibitedParagraphChild)
  		.forEach(function(child) {
  			// "Record the values of the one-node list consisting of child, and
  			// let values be the result."
  			var values = recordValues([child]);
  
  			// "Split the parent of the one-node list consisting of child."
  			splitParent([child]);
  
  			// "Restore the values from values."
  			restoreValues(values);
  		});
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "Record the values of the one-node list consisting of node, and let
  	// values be the result."
  	var values = recordValues([node]);
  
  	// "While node is not an allowed child of its parent, split the parent of
  	// the one-node list consisting of node."
  	while (!isAllowedChild(node, node.parentNode)) {
  		splitParent([node]);
  	}
  
  	// "Restore the values from values."
  	restoreValues(values);
  }
  
  function normalizeSublists(item) {
  	// "If item is not an li or it is not editable or its parent is not
  	// editable, abort these steps."
  	if (!isHtmlElement(item, "LI")
  	|| !isEditable(item)
  	|| !isEditable(item.parentNode)) {
  		return;
  	}
  
  	// "Let new item be null."
  	var newItem = null;
  
  	// "While item has an ol or ul child:"
  	while ([].some.call(item.childNodes, function (node) { return isHtmlElement(node, ["OL", "UL"]) })) {
  		// "Let child be the last child of item."
  		var child = item.lastChild;
  
  		// "If child is an ol or ul, or new item is null and child is a Text
  		// node whose data consists of zero of more space characters:"
  		if (isHtmlElement(child, ["OL", "UL"])
  		|| (!newItem && child.nodeType == Node.TEXT_NODE && /^[ \t\n\f\r]*$/.test(child.data))) {
  			// "Set new item to null."
  			newItem = null;
  
  			// "Insert child into the parent of item immediately following
  			// item, preserving ranges."
  			movePreservingRanges(child, item.parentNode, 1 + getNodeIndex(item));
  
  		// "Otherwise:"
  		} else {
  			// "If new item is null, let new item be the result of calling
  			// createElement("li") on the ownerDocument of item, then insert
  			// new item into the parent of item immediately after item."
  			if (!newItem) {
  				newItem = item.ownerDocument.createElement("li");
  				item.parentNode.insertBefore(newItem, item.nextSibling);
  			}
  
  			// "Insert child into new item as its first child, preserving
  			// ranges."
  			movePreservingRanges(child, newItem, 0);
  		}
  	}
  }
  
  function getSelectionListState() {
  	// "If the active range is null, return "none"."
  	if (!getActiveRange()) {
  		return "none";
  	}
  
  	// "Block-extend the active range, and let new range be the result."
  	var newRange = blockExtend(getActiveRange());
  
  	// "Let node list be a list of nodes, initially empty."
  	//
  	// "For each node contained in new range, append node to node list if the
  	// last member of node list (if any) is not an ancestor of node; node is
  	// editable; node is not an indentation element; and node is either an ol
  	// or ul, or the child of an ol or ul, or an allowed child of "li"."
  	var nodeList = getContainedNodes(newRange, function(node) {
  		return isEditable(node)
  			&& !isIndentationElement(node)
  			&& (isHtmlElement(node, ["ol", "ul"])
  			|| isHtmlElement(node.parentNode, ["ol", "ul"])
  			|| isAllowedChild(node, "li"));
  	});
  
  	// "If node list is empty, return "none"."
  	if (!nodeList.length) {
  		return "none";
  	}
  
  	// "If every member of node list is either an ol or the child of an ol or
  	// the child of an li child of an ol, and none is a ul or an ancestor of a
  	// ul, return "ol"."
  	if (nodeList.every(function(node) {
  		return isHtmlElement(node, "ol")
  			|| isHtmlElement(node.parentNode, "ol")
  			|| (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ol"));
  	})
  	&& !nodeList.some(function(node) { return isHtmlElement(node, "ul") || ("querySelector" in node && node.querySelector("ul")) })) {
  		return "ol";
  	}
  
  	// "If every member of node list is either a ul or the child of a ul or the
  	// child of an li child of a ul, and none is an ol or an ancestor of an ol,
  	// return "ul"."
  	if (nodeList.every(function(node) {
  		return isHtmlElement(node, "ul")
  			|| isHtmlElement(node.parentNode, "ul")
  			|| (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ul"));
  	})
  	&& !nodeList.some(function(node) { return isHtmlElement(node, "ol") || ("querySelector" in node && node.querySelector("ol")) })) {
  		return "ul";
  	}
  
  	var hasOl = nodeList.some(function(node) {
  		return isHtmlElement(node, "ol")
  			|| isHtmlElement(node.parentNode, "ol")
  			|| ("querySelector" in node && node.querySelector("ol"))
  			|| (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ol"));
  	});
  	var hasUl = nodeList.some(function(node) {
  		return isHtmlElement(node, "ul")
  			|| isHtmlElement(node.parentNode, "ul")
  			|| ("querySelector" in node && node.querySelector("ul"))
  			|| (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ul"));
  	});
  	// "If some member of node list is either an ol or the child or ancestor of
  	// an ol or the child of an li child of an ol, and some member of node list
  	// is either a ul or the child or ancestor of a ul or the child of an li
  	// child of a ul, return "mixed"."
  	if (hasOl && hasUl) {
  		return "mixed";
  	}
  
  	// "If some member of node list is either an ol or the child or ancestor of
  	// an ol or the child of an li child of an ol, return "mixed ol"."
  	if (hasOl) {
  		return "mixed ol";
  	}
  
  	// "If some member of node list is either a ul or the child or ancestor of
  	// a ul or the child of an li child of a ul, return "mixed ul"."
  	if (hasUl) {
  		return "mixed ul";
  	}
  
  	// "Return "none"."
  	return "none";
  }
  
  function getAlignmentValue(node) {
  	// "While node is neither null nor an Element, or it is an Element but its
  	// "display" property has resolved value "inline" or "none", set node to
  	// its parent."
  	while ((node && node.nodeType != Node.ELEMENT_NODE)
  	|| (node.nodeType == Node.ELEMENT_NODE
  	&& ["inline", "none"].indexOf(getComputedStyle(node).display) != -1)) {
  		node = node.parentNode;
  	}
  
  	// "If node is not an Element, return "left"."
  	if (!node || node.nodeType != Node.ELEMENT_NODE) {
  		return "left";
  	}
  
  	var resolvedValue = getComputedStyle(node).textAlign
  		// Hack around browser non-standardness
  		.replace(/^-(moz|webkit)-/, "")
  		.replace(/^auto$/, "start");
  
  	// "If node's "text-align" property has resolved value "start", return
  	// "left" if the directionality of node is "ltr", "right" if it is "rtl"."
  	if (resolvedValue == "start") {
  		return getDirectionality(node) == "ltr" ? "left" : "right";
  	}
  
  	// "If node's "text-align" property has resolved value "end", return
  	// "right" if the directionality of node is "ltr", "left" if it is "rtl"."
  	if (resolvedValue == "end") {
  		return getDirectionality(node) == "ltr" ? "right" : "left";
  	}
  
  	// "If node's "text-align" property has resolved value "center", "justify",
  	// "left", or "right", return that value."
  	if (["center", "justify", "left", "right"].indexOf(resolvedValue) != -1) {
  		return resolvedValue;
  	}
  
  	// "Return "left"."
  	return "left";
  }
  
  function getNextEquivalentPoint(node, offset) {
  	// "If node's length is zero, return null."
  	if (getNodeLength(node) == 0) {
  		return null;
  	}
  
  	// "If offset is node's length, and node's parent is not null, and node is
  	// an inline node, return (node's parent, 1 + node's index)."
  	if (offset == getNodeLength(node)
  	&& node.parentNode
  	&& isInlineNode(node)) {
  		return [node.parentNode, 1 + getNodeIndex(node)];
  	}
  
  	// "If node has a child with index offset, and that child's length is not
  	// zero, and that child is an inline node, return (that child, 0)."
  	if (0 <= offset
  	&& offset < node.childNodes.length
  	&& getNodeLength(node.childNodes[offset]) != 0
  	&& isInlineNode(node.childNodes[offset])) {
  		return [node.childNodes[offset], 0];
  	}
  
  	// "Return null."
  	return null;
  }
  
  function getPreviousEquivalentPoint(node, offset) {
  	// "If node's length is zero, return null."
  	if (getNodeLength(node) == 0) {
  		return null;
  	}
  
  	// "If offset is 0, and node's parent is not null, and node is an inline
  	// node, return (node's parent, node's index)."
  	if (offset == 0
  	&& node.parentNode
  	&& isInlineNode(node)) {
  		return [node.parentNode, getNodeIndex(node)];
  	}
  
  	// "If node has a child with index offset âˆ’ 1, and that child's length is
  	// not zero, and that child is an inline node, return (that child, that
  	// child's length)."
  	if (0 <= offset - 1
  	&& offset - 1 < node.childNodes.length
  	&& getNodeLength(node.childNodes[offset - 1]) != 0
  	&& isInlineNode(node.childNodes[offset - 1])) {
  		return [node.childNodes[offset - 1], getNodeLength(node.childNodes[offset - 1])];
  	}
  
  	// "Return null."
  	return null;
  }
  
  function getFirstEquivalentPoint(node, offset) {
  	// "While (node, offset)'s previous equivalent point is not null, set
  	// (node, offset) to its previous equivalent point."
  	var prev;
  	while (prev = getPreviousEquivalentPoint(node, offset)) {
  		node = prev[0];
  		offset = prev[1];
  	}
  
  	// "Return (node, offset)."
  	return [node, offset];
  }
  
  function getLastEquivalentPoint(node, offset) {
  	// "While (node, offset)'s next equivalent point is not null, set (node,
  	// offset) to its next equivalent point."
  	var next;
  	while (next = getNextEquivalentPoint(node, offset)) {
  		node = next[0];
  		offset = next[1];
  	}
  
  	// "Return (node, offset)."
  	return [node, offset];
  }
  
  //@}
  ///// Block-extending a range /////
  //@{
  
  // "A boundary point (node, offset) is a block start point if either node's
  // parent is null and offset is zero; or node has a child with index offset âˆ’
  // 1, and that child is either a visible block node or a visible br."
  function isBlockStartPoint(node, offset) {
  	return (!node.parentNode && offset == 0)
  		|| (0 <= offset - 1
  		&& offset - 1 < node.childNodes.length
  		&& isVisible(node.childNodes[offset - 1])
  		&& (isBlockNode(node.childNodes[offset - 1])
  		|| isHtmlElement(node.childNodes[offset - 1], "br")));
  }
  
  // "A boundary point (node, offset) is a block end point if either node's
  // parent is null and offset is node's length; or node has a child with index
  // offset, and that child is a visible block node."
  function isBlockEndPoint(node, offset) {
  	return (!node.parentNode && offset == getNodeLength(node))
  		|| (offset < node.childNodes.length
  		&& isVisible(node.childNodes[offset])
  		&& isBlockNode(node.childNodes[offset]));
  }
  
  // "A boundary point is a block boundary point if it is either a block start
  // point or a block end point."
  function isBlockBoundaryPoint(node, offset) {
  	return isBlockStartPoint(node, offset)
  		|| isBlockEndPoint(node, offset);
  }
  
  function blockExtend(range) {
  	// "Let start node, start offset, end node, and end offset be the start
  	// and end nodes and offsets of the range."
  	var startNode = range.startContainer;
  	var startOffset = range.startOffset;
  	var endNode = range.endContainer;
  	var endOffset = range.endOffset;
  
  	// "If some ancestor container of start node is an li, set start offset to
  	// the index of the last such li in tree order, and set start node to that
  	// li's parent."
  	var liAncestors = getAncestors(startNode).concat(startNode)
  		.filter(function(ancestor) { return isHtmlElement(ancestor, "li") })
  		.slice(-1);
  	if (liAncestors.length) {
  		startOffset = getNodeIndex(liAncestors[0]);
  		startNode = liAncestors[0].parentNode;
  	}
  
  	// "If (start node, start offset) is not a block start point, repeat the
  	// following steps:"
  	if (!isBlockStartPoint(startNode, startOffset)) do {
  		// "If start offset is zero, set it to start node's index, then set
  		// start node to its parent."
  		if (startOffset == 0) {
  			startOffset = getNodeIndex(startNode);
  			startNode = startNode.parentNode;
  
  		// "Otherwise, subtract one from start offset."
  		} else {
  			startOffset--;
  		}
  
  		// "If (start node, start offset) is a block boundary point, break from
  		// this loop."
  	} while (!isBlockBoundaryPoint(startNode, startOffset));
  
  	// "While start offset is zero and start node's parent is not null, set
  	// start offset to start node's index, then set start node to its parent."
  	while (startOffset == 0
  	&& startNode.parentNode) {
  		startOffset = getNodeIndex(startNode);
  		startNode = startNode.parentNode;
  	}
  
  	// "If some ancestor container of end node is an li, set end offset to one
  	// plus the index of the last such li in tree order, and set end node to
  	// that li's parent."
  	var liAncestors = getAncestors(endNode).concat(endNode)
  		.filter(function(ancestor) { return isHtmlElement(ancestor, "li") })
  		.slice(-1);
  	if (liAncestors.length) {
  		endOffset = 1 + getNodeIndex(liAncestors[0]);
  		endNode = liAncestors[0].parentNode;
  	}
  
  	// "If (end node, end offset) is not a block end point, repeat the
  	// following steps:"
  	if (!isBlockEndPoint(endNode, endOffset)) do {
  		// "If end offset is end node's length, set it to one plus end node's
  		// index, then set end node to its parent."
  		if (endOffset == getNodeLength(endNode)) {
  			endOffset = 1 + getNodeIndex(endNode);
  			endNode = endNode.parentNode;
  
  		// "Otherwise, add one to end offset.
  		} else {
  			endOffset++;
  		}
  
  		// "If (end node, end offset) is a block boundary point, break from
  		// this loop."
  	} while (!isBlockBoundaryPoint(endNode, endOffset));
  
  	// "While end offset is end node's length and end node's parent is not
  	// null, set end offset to one plus end node's index, then set end node to
  	// its parent."
  	while (endOffset == getNodeLength(endNode)
  	&& endNode.parentNode) {
  		endOffset = 1 + getNodeIndex(endNode);
  		endNode = endNode.parentNode;
  	}
  
  	// "Let new range be a new range whose start and end nodes and offsets
  	// are start node, start offset, end node, and end offset."
  	var newRange = startNode.ownerDocument.createRange();
  	newRange.setStart(startNode, startOffset);
  	newRange.setEnd(endNode, endOffset);
  
  	// "Return new range."
  	return newRange;
  }
  
  function followsLineBreak(node) {
  	// "Let offset be zero."
  	var offset = 0;
  
  	// "While (node, offset) is not a block boundary point:"
  	while (!isBlockBoundaryPoint(node, offset)) {
  		// "If node has a visible child with index offset minus one, return
  		// false."
  		if (0 <= offset - 1
  		&& offset - 1 < node.childNodes.length
  		&& isVisible(node.childNodes[offset - 1])) {
  			return false;
  		}
  
  		// "If offset is zero or node has no children, set offset to node's
  		// index, then set node to its parent."
  		if (offset == 0
  		|| !node.hasChildNodes()) {
  			offset = getNodeIndex(node);
  			node = node.parentNode;
  
  		// "Otherwise, set node to its child with index offset minus one, then
  		// set offset to node's length."
  		} else {
  			node = node.childNodes[offset - 1];
  			offset = getNodeLength(node);
  		}
  	}
  
  	// "Return true."
  	return true;
  }
  
  function precedesLineBreak(node) {
  	// "Let offset be node's length."
  	var offset = getNodeLength(node);
  
  	// "While (node, offset) is not a block boundary point:"
  	while (!isBlockBoundaryPoint(node, offset)) {
  		// "If node has a visible child with index offset, return false."
  		if (offset < node.childNodes.length
  		&& isVisible(node.childNodes[offset])) {
  			return false;
  		}
  
  		// "If offset is node's length or node has no children, set offset to
  		// one plus node's index, then set node to its parent."
  		if (offset == getNodeLength(node)
  		|| !node.hasChildNodes()) {
  			offset = 1 + getNodeIndex(node);
  			node = node.parentNode;
  
  		// "Otherwise, set node to its child with index offset and set offset
  		// to zero."
  		} else {
  			node = node.childNodes[offset];
  			offset = 0;
  		}
  	}
  
  	// "Return true."
  	return true;
  }
  
  //@}
  ///// Recording and restoring overrides /////
  //@{
  
  function recordCurrentOverrides() {
  	// "Let overrides be a list of (string, string or boolean) ordered pairs,
  	// initially empty."
  	var overrides = [];
  
  	// "If there is a value override for "createLink", add ("createLink", value
  	// override for "createLink") to overrides."
  	if (getValueOverride("createlink") !== undefined) {
  		overrides.push(["createlink", getValueOverride("createlink")]);
  	}
  
  	// "For each command in the list "bold", "italic", "strikethrough",
  	// "subscript", "superscript", "underline", in order: if there is a state
  	// override for command, add (command, command's state override) to
  	// overrides."
  	["bold", "italic", "strikethrough", "subscript", "superscript",
  	"underline"].forEach(function(command) {
  		if (getStateOverride(command) !== undefined) {
  			overrides.push([command, getStateOverride(command)]);
  		}
  	});
  
  	// "For each command in the list "fontName", "fontSize", "foreColor",
  	// "hiliteColor", in order: if there is a value override for command, add
  	// (command, command's value override) to overrides."
  	["fontname", "fontsize", "forecolor",
  	"hilitecolor"].forEach(function(command) {
  		if (getValueOverride(command) !== undefined) {
  			overrides.push([command, getValueOverride(command)]);
  		}
  	});
  
  	// "Return overrides."
  	return overrides;
  }
  
  function recordCurrentStatesAndValues() {
  	// "Let overrides be a list of (string, string or boolean) ordered pairs,
  	// initially empty."
  	var overrides = [];
  
  	// "Let node be the first formattable node effectively contained in the
  	// active range, or null if there is none."
  	var node = getAllEffectivelyContainedNodes(getActiveRange())
  		.filter(isFormattableNode)[0];
  
  	// "If node is null, return overrides."
  	if (!node) {
  		return overrides;
  	}
  
  	// "Add ("createLink", node's effective command value for "createLink") to
  	// overrides."
  	overrides.push(["createlink", getEffectiveCommandValue(node, "createlink")]);
  
  	// "For each command in the list "bold", "italic", "strikethrough",
  	// "subscript", "superscript", "underline", in order: if node's effective
  	// command value for command is one of its inline command activated values,
  	// add (command, true) to overrides, and otherwise add (command, false) to
  	// overrides."
  	["bold", "italic", "strikethrough", "subscript", "superscript",
  	"underline"].forEach(function(command) {
  		if (commands[command].inlineCommandActivatedValues
  		.indexOf(getEffectiveCommandValue(node, command)) != -1) {
  			overrides.push([command, true]);
  		} else {
  			overrides.push([command, false]);
  		}
  	});
  
  	// "For each command in the list "fontName", "foreColor", "hiliteColor", in
  	// order: add (command, command's value) to overrides."
  	["fontname", "fontsize", "forecolor", "hilitecolor"].forEach(function(command) {
  		overrides.push([command, commands[command].value()]);
  	});
  
  	// "Add ("fontSize", node's effective command value for "fontSize") to
  	// overrides."
  	overrides.push(["fontsize", getEffectiveCommandValue(node, "fontsize")]);
  
  	// "Return overrides."
  	return overrides;
  }
  
  function restoreStatesAndValues(overrides) {
  	// "Let node be the first formattable node effectively contained in the
  	// active range, or null if there is none."
  	var node = getAllEffectivelyContainedNodes(getActiveRange())
  		.filter(isFormattableNode)[0];
  
  	// "If node is not null, then for each (command, override) pair in
  	// overrides, in order:"
  	if (node) {
  		for (var i = 0; i < overrides.length; i++) {
  			var command = overrides[i][0];
  			var override = overrides[i][1];
  
  			// "If override is a boolean, and queryCommandState(command)
  			// returns something different from override, call
  			// execCommand(command)."
  			if (typeof override == "boolean"
  			&& myQueryCommandState(command) != override) {
  				myExecCommand(command);
  
  			// "Otherwise, if override is a string, and command is neither
  			// "createLink" nor "fontSize", and queryCommandValue(command)
  			// returns something not equivalent to override, call
  			// execCommand(command, false, override)."
  			} else if (typeof override == "string"
  			&& command != "createlink"
  			&& command != "fontsize"
  			&& !areEquivalentValues(command, myQueryCommandValue(command), override)) {
  				myExecCommand(command, false, override);
  
  			// "Otherwise, if override is a string; and command is
  			// "createLink"; and either there is a value override for
  			// "createLink" that is not equal to override, or there is no value
  			// override for "createLink" and node's effective command value for
  			// "createLink" is not equal to override: call
  			// execCommand("createLink", false, override)."
  			} else if (typeof override == "string"
  			&& command == "createlink"
  			&& (
  				(
  					getValueOverride("createlink") !== undefined
  					&& getValueOverride("createlink") !== override
  				) || (
  					getValueOverride("createlink") === undefined
  					&& getEffectiveCommandValue(node, "createlink") !== override
  				)
  			)) {
  				myExecCommand("createlink", false, override);
  
  			// "Otherwise, if override is a string; and command is "fontSize";
  			// and either there is a value override for "fontSize" that is not
  			// equal to override, or there is no value override for "fontSize"
  			// and node's effective command value for "fontSize" is not loosely
  			// equivalent to override:"
  			} else if (typeof override == "string"
  			&& command == "fontsize"
  			&& (
  				(
  					getValueOverride("fontsize") !== undefined
  					&& getValueOverride("fontsize") !== override
  				) || (
  					getValueOverride("fontsize") === undefined
  					&& !areLooselyEquivalentValues(command, getEffectiveCommandValue(node, "fontsize"), override)
  				)
  			)) {
  				// "Convert override to an integer number of pixels, and set
  				// override to the legacy font size for the result."
  				override = getLegacyFontSize(override);
  
  				// "Call execCommand("fontSize", false, override)."
  				myExecCommand("fontsize", false, override);
  
  			// "Otherwise, continue this loop from the beginning."
  			} else {
  				continue;
  			}
  
  			// "Set node to the first formattable node effectively contained in
  			// the active range, if there is one."
  			node = getAllEffectivelyContainedNodes(getActiveRange())
  				.filter(isFormattableNode)[0]
  				|| node;
  		}
  
  	// "Otherwise, for each (command, override) pair in overrides, in order:"
  	} else {
  		for (var i = 0; i < overrides.length; i++) {
  			var command = overrides[i][0];
  			var override = overrides[i][1];
  
  			// "If override is a boolean, set the state override for command to
  			// override."
  			if (typeof override == "boolean") {
  				setStateOverride(command, override);
  			}
  
  			// "If override is a string, set the value override for command to
  			// override."
  			if (typeof override == "string") {
  				setValueOverride(command, override);
  			}
  		}
  	}
  }
  
  //@}
  ///// Deleting the selection /////
  //@{
  
  // The flags argument is a dictionary that can have blockMerging,
  // stripWrappers, and/or direction as keys.
  function deleteSelection(flags) {
  	if (flags === undefined) {
  		flags = {};
  	}
  
  	var blockMerging = "blockMerging" in flags ? Boolean(flags.blockMerging) : true;
  	var stripWrappers = "stripWrappers" in flags ? Boolean(flags.stripWrappers) : true;
  	var direction = "direction" in flags ? flags.direction : "forward";
  
  	// "If the active range is null, abort these steps and do nothing."
  	if (!getActiveRange()) {
  		return;
  	}
  
  	// "Canonicalize whitespace at the active range's start."
  	canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);
  
  	// "Canonicalize whitespace at the active range's end."
  	canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset);
  
  	// "Let (start node, start offset) be the last equivalent point for the
  	// active range's start."
  	var start = getLastEquivalentPoint(getActiveRange().startContainer, getActiveRange().startOffset);
  	var startNode = start[0];
  	var startOffset = start[1];
  
  	// "Let (end node, end offset) be the first equivalent point for the active
  	// range's end."
  	var end = getFirstEquivalentPoint(getActiveRange().endContainer, getActiveRange().endOffset);
  	var endNode = end[0];
  	var endOffset = end[1];
  
  	// "If (end node, end offset) is not after (start node, start offset):"
  	if (getPosition(endNode, endOffset, startNode, startOffset) !== "after") {
  		// "If direction is "forward", call collapseToStart() on the context
  		// object's Selection."
  		//
  		// Here and in a few other places, we check rangeCount to work around a
  		// WebKit bug: it will sometimes incorrectly remove ranges from the
  		// selection if nodes are removed, so collapseToStart() will throw.
  		// This will break everything if we're using an actual selection, but
  		// if getActiveRange() is really just returning globalRange and that's
  		// all we care about, it will work fine.  I only add the extra check
  		// for errors I actually hit in testing.
  		if (direction == "forward") {
  			if (getSelection().rangeCount) {
  				getSelection().collapseToStart();
  			}
  			getActiveRange().collapse(true);
  
  		// "Otherwise, call collapseToEnd() on the context object's Selection."
  		} else {
  			getSelection().collapseToEnd();
  			getActiveRange().collapse(false);
  		}
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "If start node is a Text node and start offset is 0, set start offset to
  	// the index of start node, then set start node to its parent."
  	if (startNode.nodeType == Node.TEXT_NODE
  	&& startOffset == 0) {
  		startOffset = getNodeIndex(startNode);
  		startNode = startNode.parentNode;
  	}
  
  	// "If end node is a Text node and end offset is its length, set end offset
  	// to one plus the index of end node, then set end node to its parent."
  	if (endNode.nodeType == Node.TEXT_NODE
  	&& endOffset == getNodeLength(endNode)) {
  		endOffset = 1 + getNodeIndex(endNode);
  		endNode = endNode.parentNode;
  	}
  
  	// "Call collapse(start node, start offset) on the context object's
  	// Selection."
  	getSelection().collapse(startNode, startOffset);
  	getActiveRange().setStart(startNode, startOffset);
  
  	// "Call extend(end node, end offset) on the context object's Selection."
  	getSelection().extend(endNode, endOffset);
  	getActiveRange().setEnd(endNode, endOffset);
  
  	// "Let start block be the active range's start node."
  	var startBlock = getActiveRange().startContainer;
  
  	// "While start block's parent is in the same editing host and start block
  	// is an inline node, set start block to its parent."
  	while (inSameEditingHost(startBlock, startBlock.parentNode)
  	&& isInlineNode(startBlock)) {
  		startBlock = startBlock.parentNode;
  	}
  
  	// "If start block is neither a block node nor an editing host, or "span"
  	// is not an allowed child of start block, or start block is a td or th,
  	// set start block to null."
  	if ((!isBlockNode(startBlock) && !isEditingHost(startBlock))
  	|| !isAllowedChild("span", startBlock)
  	|| isHtmlElement(startBlock, ["td", "th"])) {
  		startBlock = null;
  	}
  
  	// "Let end block be the active range's end node."
  	var endBlock = getActiveRange().endContainer;
  
  	// "While end block's parent is in the same editing host and end block is
  	// an inline node, set end block to its parent."
  	while (inSameEditingHost(endBlock, endBlock.parentNode)
  	&& isInlineNode(endBlock)) {
  		endBlock = endBlock.parentNode;
  	}
  
  	// "If end block is neither a block node nor an editing host, or "span" is
  	// not an allowed child of end block, or end block is a td or th, set end
  	// block to null."
  	if ((!isBlockNode(endBlock) && !isEditingHost(endBlock))
  	|| !isAllowedChild("span", endBlock)
  	|| isHtmlElement(endBlock, ["td", "th"])) {
  		endBlock = null;
  	}
  
  	// "Record current states and values, and let overrides be the result."
  	var overrides = recordCurrentStatesAndValues();
  
  	// "If start node and end node are the same, and start node is an editable
  	// Text node:"
  	if (startNode == endNode
  	&& isEditable(startNode)
  	&& startNode.nodeType == Node.TEXT_NODE) {
  		// "Call deleteData(start offset, end offset âˆ’ start offset) on start
  		// node."
  		startNode.deleteData(startOffset, endOffset - startOffset);
  
  		// "Canonicalize whitespace at (start node, start offset), with fix
  		// collapsed space false."
  		canonicalizeWhitespace(startNode, startOffset, false);
  
  		// "If direction is "forward", call collapseToStart() on the context
  		// object's Selection."
  		if (direction == "forward") {
  			if (getSelection().rangeCount) {
  				getSelection().collapseToStart();
  			}
  			getActiveRange().collapse(true);
  
  		// "Otherwise, call collapseToEnd() on the context object's Selection."
  		} else {
  			getSelection().collapseToEnd();
  			getActiveRange().collapse(false);
  		}
  
  		// "Restore states and values from overrides."
  		restoreStatesAndValues(overrides);
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "If start node is an editable Text node, call deleteData() on it, with
  	// start offset as the first argument and (length of start node âˆ’ start
  	// offset) as the second argument."
  	if (isEditable(startNode)
  	&& startNode.nodeType == Node.TEXT_NODE) {
  		startNode.deleteData(startOffset, getNodeLength(startNode) - startOffset);
  	}
  
  	// "Let node list be a list of nodes, initially empty."
  	//
  	// "For each node contained in the active range, append node to node list
  	// if the last member of node list (if any) is not an ancestor of node;
  	// node is editable; and node is not a thead, tbody, tfoot, tr, th, or td."
  	var nodeList = getContainedNodes(getActiveRange(),
  		function(node) {
  			return isEditable(node)
  				&& !isHtmlElement(node, ["thead", "tbody", "tfoot", "tr", "th", "td"]);
  		}
  	);
  
  	// "For each node in node list:"
  	for (var i = 0; i < nodeList.length; i++) {
  		var node = nodeList[i];
  
  		// "Let parent be the parent of node."
  		var parent_ = node.parentNode;
  
  		// "Remove node from parent."
  		parent_.removeChild(node);
  
  		// "If the block node of parent has no visible children, and parent is
  		// editable or an editing host, call createElement("br") on the context
  		// object and append the result as the last child of parent."
  		if (![].some.call(getBlockNodeOf(parent_).childNodes, isVisible)
  		&& (isEditable(parent_) || isEditingHost(parent_))) {
  			parent_.appendChild(document.createElement("br"));
  		}
  
  		// "If strip wrappers is true or parent is not an ancestor container of
  		// start node, while parent is an editable inline node with length 0,
  		// let grandparent be the parent of parent, then remove parent from
  		// grandparent, then set parent to grandparent."
  		if (stripWrappers
  		|| (!isAncestor(parent_, startNode) && parent_ != startNode)) {
  			while (isEditable(parent_)
  			&& isInlineNode(parent_)
  			&& getNodeLength(parent_) == 0) {
  				var grandparent = parent_.parentNode;
  				grandparent.removeChild(parent_);
  				parent_ = grandparent;
  			}
  		}
  	}
  
  	// "If end node is an editable Text node, call deleteData(0, end offset) on
  	// it."
  	if (isEditable(endNode)
  	&& endNode.nodeType == Node.TEXT_NODE) {
  		endNode.deleteData(0, endOffset);
  	}
  
  	// "Canonicalize whitespace at the active range's start, with fix collapsed
  	// space false."
  	canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset, false);
  
  	// "Canonicalize whitespace at the active range's end, with fix collapsed
  	// space false."
  	canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset, false);
  
  	// "If block merging is false, or start block or end block is null, or
  	// start block is not in the same editing host as end block, or start block
  	// and end block are the same:"
  	if (!blockMerging
  	|| !startBlock
  	|| !endBlock
  	|| !inSameEditingHost(startBlock, endBlock)
  	|| startBlock == endBlock) {
  		// "If direction is "forward", call collapseToStart() on the context
  		// object's Selection."
  		if (direction == "forward") {
  			if (getSelection().rangeCount) {
  				getSelection().collapseToStart();
  			}
  			getActiveRange().collapse(true);
  
  		// "Otherwise, call collapseToEnd() on the context object's Selection."
  		} else {
  			if (getSelection().rangeCount) {
  				getSelection().collapseToEnd();
  			}
  			getActiveRange().collapse(false);
  		}
  
  		// "Restore states and values from overrides."
  		restoreStatesAndValues(overrides);
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "If start block has one child, which is a collapsed block prop, remove
  	// its child from it."
  	if (startBlock.children.length == 1
  	&& isCollapsedBlockProp(startBlock.firstChild)) {
  		startBlock.removeChild(startBlock.firstChild);
  	}
  
  	// "If start block is an ancestor of end block:"
  	if (isAncestor(startBlock, endBlock)) {
  		// "Let reference node be end block."
  		var referenceNode = endBlock;
  
  		// "While reference node is not a child of start block, set reference
  		// node to its parent."
  		while (referenceNode.parentNode != startBlock) {
  			referenceNode = referenceNode.parentNode;
  		}
  
  		// "Call collapse() on the context object's Selection, with first
  		// argument start block and second argument the index of reference
  		// node."
  		getSelection().collapse(startBlock, getNodeIndex(referenceNode));
  		getActiveRange().setStart(startBlock, getNodeIndex(referenceNode));
  		getActiveRange().collapse(true);
  
  		// "If end block has no children:"
  		if (!endBlock.hasChildNodes()) {
  			// "While end block is editable and is the only child of its parent
  			// and is not a child of start block, let parent equal end block,
  			// then remove end block from parent, then set end block to
  			// parent."
  			while (isEditable(endBlock)
  			&& endBlock.parentNode.childNodes.length == 1
  			&& endBlock.parentNode != startBlock) {
  				var parent_ = endBlock;
  				parent_.removeChild(endBlock);
  				endBlock = parent_;
  			}
  
  			// "If end block is editable and is not an inline node, and its
  			// previousSibling and nextSibling are both inline nodes, call
  			// createElement("br") on the context object and insert it into end
  			// block's parent immediately after end block."
  			if (isEditable(endBlock)
  			&& !isInlineNode(endBlock)
  			&& isInlineNode(endBlock.previousSibling)
  			&& isInlineNode(endBlock.nextSibling)) {
  				endBlock.parentNode.insertBefore(document.createElement("br"), endBlock.nextSibling);
  			}
  
  			// "If end block is editable, remove it from its parent."
  			if (isEditable(endBlock)) {
  				endBlock.parentNode.removeChild(endBlock);
  			}
  
  			// "Restore states and values from overrides."
  			restoreStatesAndValues(overrides);
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If end block's firstChild is not an inline node, restore states and
  		// values from overrides, then abort these steps."
  		if (!isInlineNode(endBlock.firstChild)) {
  			restoreStatesAndValues(overrides);
  			return;
  		}
  
  		// "Let children be a list of nodes, initially empty."
  		var children = [];
  
  		// "Append the first child of end block to children."
  		children.push(endBlock.firstChild);
  
  		// "While children's last member is not a br, and children's last
  		// member's nextSibling is an inline node, append children's last
  		// member's nextSibling to children."
  		while (!isHtmlElement(children[children.length - 1], "br")
  		&& isInlineNode(children[children.length - 1].nextSibling)) {
  			children.push(children[children.length - 1].nextSibling);
  		}
  
  		// "Record the values of children, and let values be the result."
  		var values = recordValues(children);
  
  		// "While children's first member's parent is not start block, split
  		// the parent of children."
  		while (children[0].parentNode != startBlock) {
  			splitParent(children);
  		}
  
  		// "If children's first member's previousSibling is an editable br,
  		// remove that br from its parent."
  		if (isEditable(children[0].previousSibling)
  		&& isHtmlElement(children[0].previousSibling, "br")) {
  			children[0].parentNode.removeChild(children[0].previousSibling);
  		}
  
  	// "Otherwise, if start block is a descendant of end block:"
  	} else if (isDescendant(startBlock, endBlock)) {
  		// "Call collapse() on the context object's Selection, with first
  		// argument start block and second argument start block's length."
  		getSelection().collapse(startBlock, getNodeLength(startBlock));
  		getActiveRange().setStart(startBlock, getNodeLength(startBlock));
  		getActiveRange().collapse(true);
  
  		// "Let reference node be start block."
  		var referenceNode = startBlock;
  
  		// "While reference node is not a child of end block, set reference
  		// node to its parent."
  		while (referenceNode.parentNode != endBlock) {
  			referenceNode = referenceNode.parentNode;
  		}
  
  		// "If reference node's nextSibling is an inline node and start block's
  		// lastChild is a br, remove start block's lastChild from it."
  		if (isInlineNode(referenceNode.nextSibling)
  		&& isHtmlElement(startBlock.lastChild, "br")) {
  			startBlock.removeChild(startBlock.lastChild);
  		}
  
  		// "Let nodes to move be a list of nodes, initially empty."
  		var nodesToMove = [];
  
  		// "If reference node's nextSibling is neither null nor a block node,
  		// append it to nodes to move."
  		if (referenceNode.nextSibling
  		&& !isBlockNode(referenceNode.nextSibling)) {
  			nodesToMove.push(referenceNode.nextSibling);
  		}
  
  		// "While nodes to move is nonempty and its last member isn't a br and
  		// its last member's nextSibling is neither null nor a block node,
  		// append its last member's nextSibling to nodes to move."
  		if (nodesToMove.length
  		&& !isHtmlElement(nodesToMove[nodesToMove.length - 1], "br")
  		&& nodesToMove[nodesToMove.length - 1].nextSibling
  		&& !isBlockNode(nodesToMove[nodesToMove.length - 1].nextSibling)) {
  			nodesToMove.push(nodesToMove[nodesToMove.length - 1].nextSibling);
  		}
  
  		// "Record the values of nodes to move, and let values be the result."
  		var values = recordValues(nodesToMove);
  
  		// "For each node in nodes to move, append node as the last child of
  		// start block, preserving ranges."
  		nodesToMove.forEach(function(node) {
  			movePreservingRanges(node, startBlock, -1);
  		});
  
  	// "Otherwise:"
  	} else {
  		// "Call collapse() on the context object's Selection, with first
  		// argument start block and second argument start block's length."
  		getSelection().collapse(startBlock, getNodeLength(startBlock));
  		getActiveRange().setStart(startBlock, getNodeLength(startBlock));
  		getActiveRange().collapse(true);
  
  		// "If end block's firstChild is an inline node and start block's
  		// lastChild is a br, remove start block's lastChild from it."
  		if (isInlineNode(endBlock.firstChild)
  		&& isHtmlElement(startBlock.lastChild, "br")) {
  			startBlock.removeChild(startBlock.lastChild);
  		}
  
  		// "Record the values of end block's children, and let values be the
  		// result."
  		var values = recordValues([].slice.call(endBlock.childNodes));
  
  		// "While end block has children, append the first child of end block
  		// to start block, preserving ranges."
  		while (endBlock.hasChildNodes()) {
  			movePreservingRanges(endBlock.firstChild, startBlock, -1);
  		}
  
  		// "While end block has no children, let parent be the parent of end
  		// block, then remove end block from parent, then set end block to
  		// parent."
  		while (!endBlock.hasChildNodes()) {
  			var parent_ = endBlock.parentNode;
  			parent_.removeChild(endBlock);
  			endBlock = parent_;
  		}
  	}
  
  	// "Let ancestor be start block."
  	var ancestor = startBlock;
  
  	// "While ancestor has an inclusive ancestor ol in the same editing host
  	// whose nextSibling is also an ol in the same editing host, or an
  	// inclusive ancestor ul in the same editing host whose nextSibling is also
  	// a ul in the same editing host:"
  	while (getInclusiveAncestors(ancestor).some(function(node) {
  		return inSameEditingHost(ancestor, node)
  			&& (
  				(isHtmlElement(node, "ol") && isHtmlElement(node.nextSibling, "ol"))
  				|| (isHtmlElement(node, "ul") && isHtmlElement(node.nextSibling, "ul"))
  			) && inSameEditingHost(ancestor, node.nextSibling);
  	})) {
  		// "While ancestor and its nextSibling are not both ols in the same
  		// editing host, and are also not both uls in the same editing host,
  		// set ancestor to its parent."
  		while (!(
  			isHtmlElement(ancestor, "ol")
  			&& isHtmlElement(ancestor.nextSibling, "ol")
  			&& inSameEditingHost(ancestor, ancestor.nextSibling)
  		) && !(
  			isHtmlElement(ancestor, "ul")
  			&& isHtmlElement(ancestor.nextSibling, "ul")
  			&& inSameEditingHost(ancestor, ancestor.nextSibling)
  		)) {
  			ancestor = ancestor.parentNode;
  		}
  
  		// "While ancestor's nextSibling has children, append ancestor's
  		// nextSibling's firstChild as the last child of ancestor, preserving
  		// ranges."
  		while (ancestor.nextSibling.hasChildNodes()) {
  			movePreservingRanges(ancestor.nextSibling.firstChild, ancestor, -1);
  		}
  
  		// "Remove ancestor's nextSibling from its parent."
  		ancestor.parentNode.removeChild(ancestor.nextSibling);
  	}
  
  	// "Restore the values from values."
  	restoreValues(values);
  
  	// "If start block has no children, call createElement("br") on the context
  	// object and append the result as the last child of start block."
  	if (!startBlock.hasChildNodes()) {
  		startBlock.appendChild(document.createElement("br"));
  	}
  
  	// "Remove extraneous line breaks at the end of start block."
  	removeExtraneousLineBreaksAtTheEndOf(startBlock);
  
  	// "Restore states and values from overrides."
  	restoreStatesAndValues(overrides);
  }
  
  
  //@}
  ///// Splitting a node list's parent /////
  //@{
  
  function splitParent(nodeList) {
  	// "Let original parent be the parent of the first member of node list."
  	var originalParent = nodeList[0].parentNode;
  
  	// "If original parent is not editable or its parent is null, do nothing
  	// and abort these steps."
  	if (!isEditable(originalParent)
  	|| !originalParent.parentNode) {
  		return;
  	}
  
  	// "If the first child of original parent is in node list, remove
  	// extraneous line breaks before original parent."
  	if (nodeList.indexOf(originalParent.firstChild) != -1) {
  		removeExtraneousLineBreaksBefore(originalParent);
  	}
  
  	// "If the first child of original parent is in node list, and original
  	// parent follows a line break, set follows line break to true. Otherwise,
  	// set follows line break to false."
  	var followsLineBreak_ = nodeList.indexOf(originalParent.firstChild) != -1
  		&& followsLineBreak(originalParent);
  
  	// "If the last child of original parent is in node list, and original
  	// parent precedes a line break, set precedes line break to true.
  	// Otherwise, set precedes line break to false."
  	var precedesLineBreak_ = nodeList.indexOf(originalParent.lastChild) != -1
  		&& precedesLineBreak(originalParent);
  
  	// "If the first child of original parent is not in node list, but its last
  	// child is:"
  	if (nodeList.indexOf(originalParent.firstChild) == -1
  	&& nodeList.indexOf(originalParent.lastChild) != -1) {
  		// "For each node in node list, in reverse order, insert node into the
  		// parent of original parent immediately after original parent,
  		// preserving ranges."
  		for (var i = nodeList.length - 1; i >= 0; i--) {
  			movePreservingRanges(nodeList[i], originalParent.parentNode, 1 + getNodeIndex(originalParent));
  		}
  
  		// "If precedes line break is true, and the last member of node list
  		// does not precede a line break, call createElement("br") on the
  		// context object and insert the result immediately after the last
  		// member of node list."
  		if (precedesLineBreak_
  		&& !precedesLineBreak(nodeList[nodeList.length - 1])) {
  			nodeList[nodeList.length - 1].parentNode.insertBefore(document.createElement("br"), nodeList[nodeList.length - 1].nextSibling);
  		}
  
  		// "Remove extraneous line breaks at the end of original parent."
  		removeExtraneousLineBreaksAtTheEndOf(originalParent);
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "If the first child of original parent is not in node list:"
  	if (nodeList.indexOf(originalParent.firstChild) == -1) {
  		// "Let cloned parent be the result of calling cloneNode(false) on
  		// original parent."
  		var clonedParent = originalParent.cloneNode(false);
  
  		// "If original parent has an id attribute, unset it."
  		originalParent.removeAttribute("id");
  
  		// "Insert cloned parent into the parent of original parent immediately
  		// before original parent."
  		originalParent.parentNode.insertBefore(clonedParent, originalParent);
  
  		// "While the previousSibling of the first member of node list is not
  		// null, append the first child of original parent as the last child of
  		// cloned parent, preserving ranges."
  		while (nodeList[0].previousSibling) {
  			movePreservingRanges(originalParent.firstChild, clonedParent, clonedParent.childNodes.length);
  		}
  	}
  
  	// "For each node in node list, insert node into the parent of original
  	// parent immediately before original parent, preserving ranges."
  	for (var i = 0; i < nodeList.length; i++) {
  		movePreservingRanges(nodeList[i], originalParent.parentNode, getNodeIndex(originalParent));
  	}
  
  	// "If follows line break is true, and the first member of node list does
  	// not follow a line break, call createElement("br") on the context object
  	// and insert the result immediately before the first member of node list."
  	if (followsLineBreak_
  	&& !followsLineBreak(nodeList[0])) {
  		nodeList[0].parentNode.insertBefore(document.createElement("br"), nodeList[0]);
  	}
  
  	// "If the last member of node list is an inline node other than a br, and
  	// the first child of original parent is a br, and original parent is not
  	// an inline node, remove the first child of original parent from original
  	// parent."
  	if (isInlineNode(nodeList[nodeList.length - 1])
  	&& !isHtmlElement(nodeList[nodeList.length - 1], "br")
  	&& isHtmlElement(originalParent.firstChild, "br")
  	&& !isInlineNode(originalParent)) {
  		originalParent.removeChild(originalParent.firstChild);
  	}
  
  	// "If original parent has no children:"
  	if (!originalParent.hasChildNodes()) {
  		// "Remove original parent from its parent."
  		originalParent.parentNode.removeChild(originalParent);
  
  		// "If precedes line break is true, and the last member of node list
  		// does not precede a line break, call createElement("br") on the
  		// context object and insert the result immediately after the last
  		// member of node list."
  		if (precedesLineBreak_
  		&& !precedesLineBreak(nodeList[nodeList.length - 1])) {
  			nodeList[nodeList.length - 1].parentNode.insertBefore(document.createElement("br"), nodeList[nodeList.length - 1].nextSibling);
  		}
  
  	// "Otherwise, remove extraneous line breaks before original parent."
  	} else {
  		removeExtraneousLineBreaksBefore(originalParent);
  	}
  
  	// "If node list's last member's nextSibling is null, but its parent is not
  	// null, remove extraneous line breaks at the end of node list's last
  	// member's parent."
  	if (!nodeList[nodeList.length - 1].nextSibling
  	&& nodeList[nodeList.length - 1].parentNode) {
  		removeExtraneousLineBreaksAtTheEndOf(nodeList[nodeList.length - 1].parentNode);
  	}
  }
  
  // "To remove a node node while preserving its descendants, split the parent of
  // node's children if it has any. If it has no children, instead remove it from
  // its parent."
  function removePreservingDescendants(node) {
  	if (node.hasChildNodes()) {
  		splitParent([].slice.call(node.childNodes));
  	} else {
  		node.parentNode.removeChild(node);
  	}
  }
  
  
  //@}
  ///// Canonical space sequences /////
  //@{
  
  function canonicalSpaceSequence(n, nonBreakingStart, nonBreakingEnd) {
  	// "If n is zero, return the empty string."
  	if (n == 0) {
  		return "";
  	}
  
  	// "If n is one and both non-breaking start and non-breaking end are false,
  	// return a single space (U+0020)."
  	if (n == 1 && !nonBreakingStart && !nonBreakingEnd) {
  		return " ";
  	}
  
  	// "If n is one, return a single non-breaking space (U+00A0)."
  	if (n == 1) {
  		return "\xa0";
  	}
  
  	// "Let buffer be the empty string."
  	var buffer = "";
  
  	// "If non-breaking start is true, let repeated pair be U+00A0 U+0020.
  	// Otherwise, let it be U+0020 U+00A0."
  	var repeatedPair;
  	if (nonBreakingStart) {
  		repeatedPair = "\xa0 ";
  	} else {
  		repeatedPair = " \xa0";
  	}
  
  	// "While n is greater than three, append repeated pair to buffer and
  	// subtract two from n."
  	while (n > 3) {
  		buffer += repeatedPair;
  		n -= 2;
  	}
  
  	// "If n is three, append a three-element string to buffer depending on
  	// non-breaking start and non-breaking end:"
  	if (n == 3) {
  		buffer +=
  			!nonBreakingStart && !nonBreakingEnd ? " \xa0 "
  			: nonBreakingStart && !nonBreakingEnd ? "\xa0\xa0 "
  			: !nonBreakingStart && nonBreakingEnd ? " \xa0\xa0"
  			: nonBreakingStart && nonBreakingEnd ? "\xa0 \xa0"
  			: "impossible";
  
  	// "Otherwise, append a two-element string to buffer depending on
  	// non-breaking start and non-breaking end:"
  	} else {
  		buffer +=
  			!nonBreakingStart && !nonBreakingEnd ? "\xa0 "
  			: nonBreakingStart && !nonBreakingEnd ? "\xa0 "
  			: !nonBreakingStart && nonBreakingEnd ? " \xa0"
  			: nonBreakingStart && nonBreakingEnd ? "\xa0\xa0"
  			: "impossible";
  	}
  
  	// "Return buffer."
  	return buffer;
  }
  
  function canonicalizeWhitespace(node, offset, fixCollapsedSpace) {
  	if (fixCollapsedSpace === undefined) {
  		// "an optional boolean argument fix collapsed space that defaults to
  		// true"
  		fixCollapsedSpace = true;
  	}
  
  	// "If node is neither editable nor an editing host, abort these steps."
  	if (!isEditable(node) && !isEditingHost(node)) {
  		return;
  	}
  
  	// "Let start node equal node and let start offset equal offset."
  	var startNode = node;
  	var startOffset = offset;
  
  	// "Repeat the following steps:"
  	while (true) {
  		// "If start node has a child in the same editing host with index start
  		// offset minus one, set start node to that child, then set start
  		// offset to start node's length."
  		if (0 <= startOffset - 1
  		&& inSameEditingHost(startNode, startNode.childNodes[startOffset - 1])) {
  			startNode = startNode.childNodes[startOffset - 1];
  			startOffset = getNodeLength(startNode);
  
  		// "Otherwise, if start offset is zero and start node does not follow a
  		// line break and start node's parent is in the same editing host, set
  		// start offset to start node's index, then set start node to its
  		// parent."
  		} else if (startOffset == 0
  		&& !followsLineBreak(startNode)
  		&& inSameEditingHost(startNode, startNode.parentNode)) {
  			startOffset = getNodeIndex(startNode);
  			startNode = startNode.parentNode;
  
  		// "Otherwise, if start node is a Text node and its parent's resolved
  		// value for "white-space" is neither "pre" nor "pre-wrap" and start
  		// offset is not zero and the (start offset âˆ’ 1)st element of start
  		// node's data is a space (0x0020) or non-breaking space (0x00A0),
  		// subtract one from start offset."
  		} else if (startNode.nodeType == Node.TEXT_NODE
  		&& ["pre", "pre-wrap"].indexOf(getComputedStyle(startNode.parentNode).whiteSpace) == -1
  		&& startOffset != 0
  		&& /[ \xa0]/.test(startNode.data[startOffset - 1])) {
  			startOffset--;
  
  		// "Otherwise, break from this loop."
  		} else {
  			break;
  		}
  	}
  
  	// "Let end node equal start node and end offset equal start offset."
  	var endNode = startNode;
  	var endOffset = startOffset;
  
  	// "Let length equal zero."
  	var length = 0;
  
  	// "Let collapse spaces be true if start offset is zero and start node
  	// follows a line break, otherwise false."
  	var collapseSpaces = startOffset == 0 && followsLineBreak(startNode);
  
  	// "Repeat the following steps:"
  	while (true) {
  		// "If end node has a child in the same editing host with index end
  		// offset, set end node to that child, then set end offset to zero."
  		if (endOffset < endNode.childNodes.length
  		&& inSameEditingHost(endNode, endNode.childNodes[endOffset])) {
  			endNode = endNode.childNodes[endOffset];
  			endOffset = 0;
  
  		// "Otherwise, if end offset is end node's length and end node does not
  		// precede a line break and end node's parent is in the same editing
  		// host, set end offset to one plus end node's index, then set end node
  		// to its parent."
  		} else if (endOffset == getNodeLength(endNode)
  		&& !precedesLineBreak(endNode)
  		&& inSameEditingHost(endNode, endNode.parentNode)) {
  			endOffset = 1 + getNodeIndex(endNode);
  			endNode = endNode.parentNode;
  
  		// "Otherwise, if end node is a Text node and its parent's resolved
  		// value for "white-space" is neither "pre" nor "pre-wrap" and end
  		// offset is not end node's length and the end offsetth element of
  		// end node's data is a space (0x0020) or non-breaking space (0x00A0):"
  		} else if (endNode.nodeType == Node.TEXT_NODE
  		&& ["pre", "pre-wrap"].indexOf(getComputedStyle(endNode.parentNode).whiteSpace) == -1
  		&& endOffset != getNodeLength(endNode)
  		&& /[ \xa0]/.test(endNode.data[endOffset])) {
  			// "If fix collapsed space is true, and collapse spaces is true,
  			// and the end offsetth code unit of end node's data is a space
  			// (0x0020): call deleteData(end offset, 1) on end node, then
  			// continue this loop from the beginning."
  			if (fixCollapsedSpace
  			&& collapseSpaces
  			&& " " == endNode.data[endOffset]) {
  				endNode.deleteData(endOffset, 1);
  				continue;
  			}
  
  			// "Set collapse spaces to true if the end offsetth element of end
  			// node's data is a space (0x0020), false otherwise."
  			collapseSpaces = " " == endNode.data[endOffset];
  
  			// "Add one to end offset."
  			endOffset++;
  
  			// "Add one to length."
  			length++;
  
  		// "Otherwise, break from this loop."
  		} else {
  			break;
  		}
  	}
  
  	// "If fix collapsed space is true, then while (start node, start offset)
  	// is before (end node, end offset):"
  	if (fixCollapsedSpace) {
  		while (getPosition(startNode, startOffset, endNode, endOffset) == "before") {
  			// "If end node has a child in the same editing host with index end
  			// offset âˆ’ 1, set end node to that child, then set end offset to end
  			// node's length."
  			if (0 <= endOffset - 1
  			&& endOffset - 1 < endNode.childNodes.length
  			&& inSameEditingHost(endNode, endNode.childNodes[endOffset - 1])) {
  				endNode = endNode.childNodes[endOffset - 1];
  				endOffset = getNodeLength(endNode);
  
  			// "Otherwise, if end offset is zero and end node's parent is in the
  			// same editing host, set end offset to end node's index, then set end
  			// node to its parent."
  			} else if (endOffset == 0
  			&& inSameEditingHost(endNode, endNode.parentNode)) {
  				endOffset = getNodeIndex(endNode);
  				endNode = endNode.parentNode;
  
  			// "Otherwise, if end node is a Text node and its parent's resolved
  			// value for "white-space" is neither "pre" nor "pre-wrap" and end
  			// offset is end node's length and the last code unit of end node's
  			// data is a space (0x0020) and end node precedes a line break:"
  			} else if (endNode.nodeType == Node.TEXT_NODE
  			&& ["pre", "pre-wrap"].indexOf(getComputedStyle(endNode.parentNode).whiteSpace) == -1
  			&& endOffset == getNodeLength(endNode)
  			&& endNode.data[endNode.data.length - 1] == " "
  			&& precedesLineBreak(endNode)) {
  				// "Subtract one from end offset."
  				endOffset--;
  
  				// "Subtract one from length."
  				length--;
  
  				// "Call deleteData(end offset, 1) on end node."
  				endNode.deleteData(endOffset, 1);
  
  			// "Otherwise, break from this loop."
  			} else {
  				break;
  			}
  		}
  	}
  
  	// "Let replacement whitespace be the canonical space sequence of length
  	// length. non-breaking start is true if start offset is zero and start
  	// node follows a line break, and false otherwise. non-breaking end is true
  	// if end offset is end node's length and end node precedes a line break,
  	// and false otherwise."
  	var replacementWhitespace = canonicalSpaceSequence(length,
  		startOffset == 0 && followsLineBreak(startNode),
  		endOffset == getNodeLength(endNode) && precedesLineBreak(endNode));
  
  	// "While (start node, start offset) is before (end node, end offset):"
  	while (getPosition(startNode, startOffset, endNode, endOffset) == "before") {
  		// "If start node has a child with index start offset, set start node
  		// to that child, then set start offset to zero."
  		if (startOffset < startNode.childNodes.length) {
  			startNode = startNode.childNodes[startOffset];
  			startOffset = 0;
  
  		// "Otherwise, if start node is not a Text node or if start offset is
  		// start node's length, set start offset to one plus start node's
  		// index, then set start node to its parent."
  		} else if (startNode.nodeType != Node.TEXT_NODE
  		|| startOffset == getNodeLength(startNode)) {
  			startOffset = 1 + getNodeIndex(startNode);
  			startNode = startNode.parentNode;
  
  		// "Otherwise:"
  		} else {
  			// "Remove the first element from replacement whitespace, and let
  			// element be that element."
  			var element = replacementWhitespace[0];
  			replacementWhitespace = replacementWhitespace.slice(1);
  
  			// "If element is not the same as the start offsetth element of
  			// start node's data:"
  			if (element != startNode.data[startOffset]) {
  				// "Call insertData(start offset, element) on start node."
  				startNode.insertData(startOffset, element);
  
  				// "Call deleteData(start offset + 1, 1) on start node."
  				startNode.deleteData(startOffset + 1, 1);
  			}
  
  			// "Add one to start offset."
  			startOffset++;
  		}
  	}
  }
  
  
  //@}
  ///// Indenting and outdenting /////
  //@{
  
  function indentNodes(nodeList) {
  	// "If node list is empty, do nothing and abort these steps."
  	if (!nodeList.length) {
  		return;
  	}
  
  	// "Let first node be the first member of node list."
  	var firstNode = nodeList[0];
  
  	// "If first node's parent is an ol or ul:"
  	if (isHtmlElement(firstNode.parentNode, ["OL", "UL"])) {
  		// "Let tag be the local name of the parent of first node."
  		var tag = firstNode.parentNode.tagName;
  
  		// "Wrap node list, with sibling criteria returning true for an HTML
  		// element with local name tag and false otherwise, and new parent
  		// instructions returning the result of calling createElement(tag) on
  		// the ownerDocument of first node."
  		wrap(nodeList,
  			function(node) { return isHtmlElement(node, tag) },
  			function() { return firstNode.ownerDocument.createElement(tag) });
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "Wrap node list, with sibling criteria returning true for a simple
  	// indentation element and false otherwise, and new parent instructions
  	// returning the result of calling createElement("blockquote") on the
  	// ownerDocument of first node. Let new parent be the result."
  	var newParent = wrap(nodeList,
  		function(node) { return isSimpleIndentationElement(node) },
  		function() { return firstNode.ownerDocument.createElement("blockquote") });
  
  	// "Fix disallowed ancestors of new parent."
  	fixDisallowedAncestors(newParent);
  }
  
  function outdentNode(node) {
  	// "If node is not editable, abort these steps."
  	if (!isEditable(node)) {
  		return;
  	}
  
  	// "If node is a simple indentation element, remove node, preserving its
  	// descendants.  Then abort these steps."
  	if (isSimpleIndentationElement(node)) {
  		removePreservingDescendants(node);
  		return;
  	}
  
  	// "If node is an indentation element:"
  	if (isIndentationElement(node)) {
  		// "Unset the dir attribute of node, if any."
  		node.removeAttribute("dir");
  
  		// "Unset the margin, padding, and border CSS properties of node."
  		node.style.margin = "";
  		node.style.padding = "";
  		node.style.border = "";
  		if (node.getAttribute("style") == ""
  		// Crazy WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=68551
  		|| node.getAttribute("style") == "border-width: initial; border-color: initial; ") {
  			node.removeAttribute("style");
  		}
  
  		// "Set the tag name of node to "div"."
  		setTagName(node, "div");
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "Let current ancestor be node's parent."
  	var currentAncestor = node.parentNode;
  
  	// "Let ancestor list be a list of nodes, initially empty."
  	var ancestorList = [];
  
  	// "While current ancestor is an editable Element that is neither a simple
  	// indentation element nor an ol nor a ul, append current ancestor to
  	// ancestor list and then set current ancestor to its parent."
  	while (isEditable(currentAncestor)
  	&& currentAncestor.nodeType == Node.ELEMENT_NODE
  	&& !isSimpleIndentationElement(currentAncestor)
  	&& !isHtmlElement(currentAncestor, ["ol", "ul"])) {
  		ancestorList.push(currentAncestor);
  		currentAncestor = currentAncestor.parentNode;
  	}
  
  	// "If current ancestor is not an editable simple indentation element:"
  	if (!isEditable(currentAncestor)
  	|| !isSimpleIndentationElement(currentAncestor)) {
  		// "Let current ancestor be node's parent."
  		currentAncestor = node.parentNode;
  
  		// "Let ancestor list be the empty list."
  		ancestorList = [];
  
  		// "While current ancestor is an editable Element that is neither an
  		// indentation element nor an ol nor a ul, append current ancestor to
  		// ancestor list and then set current ancestor to its parent."
  		while (isEditable(currentAncestor)
  		&& currentAncestor.nodeType == Node.ELEMENT_NODE
  		&& !isIndentationElement(currentAncestor)
  		&& !isHtmlElement(currentAncestor, ["ol", "ul"])) {
  			ancestorList.push(currentAncestor);
  			currentAncestor = currentAncestor.parentNode;
  		}
  	}
  
  	// "If node is an ol or ul and current ancestor is not an editable
  	// indentation element:"
  	if (isHtmlElement(node, ["OL", "UL"])
  	&& (!isEditable(currentAncestor)
  	|| !isIndentationElement(currentAncestor))) {
  		// "Unset the reversed, start, and type attributes of node, if any are
  		// set."
  		node.removeAttribute("reversed");
  		node.removeAttribute("start");
  		node.removeAttribute("type");
  
  		// "Let children be the children of node."
  		var children = [].slice.call(node.childNodes);
  
  		// "If node has attributes, and its parent is not an ol or ul, set the
  		// tag name of node to "div"."
  		if (node.attributes.length
  		&& !isHtmlElement(node.parentNode, ["OL", "UL"])) {
  			setTagName(node, "div");
  
  		// "Otherwise:"
  		} else {
  			// "Record the values of node's children, and let values be the
  			// result."
  			var values = recordValues([].slice.call(node.childNodes));
  
  			// "Remove node, preserving its descendants."
  			removePreservingDescendants(node);
  
  			// "Restore the values from values."
  			restoreValues(values);
  		}
  
  		// "Fix disallowed ancestors of each member of children."
  		for (var i = 0; i < children.length; i++) {
  			fixDisallowedAncestors(children[i]);
  		}
  
  		// "Abort these steps."
  		return;
  	}
  
  	// "If current ancestor is not an editable indentation element, abort these
  	// steps."
  	if (!isEditable(currentAncestor)
  	|| !isIndentationElement(currentAncestor)) {
  		return;
  	}
  
  	// "Append current ancestor to ancestor list."
  	ancestorList.push(currentAncestor);
  
  	// "Let original ancestor be current ancestor."
  	var originalAncestor = currentAncestor;
  
  	// "While ancestor list is not empty:"
  	while (ancestorList.length) {
  		// "Let current ancestor be the last member of ancestor list."
  		//
  		// "Remove the last member of ancestor list."
  		currentAncestor = ancestorList.pop();
  
  		// "Let target be the child of current ancestor that is equal to either
  		// node or the last member of ancestor list."
  		var target = node.parentNode == currentAncestor
  			? node
  			: ancestorList[ancestorList.length - 1];
  
  		// "If target is an inline node that is not a br, and its nextSibling
  		// is a br, remove target's nextSibling from its parent."
  		if (isInlineNode(target)
  		&& !isHtmlElement(target, "BR")
  		&& isHtmlElement(target.nextSibling, "BR")) {
  			target.parentNode.removeChild(target.nextSibling);
  		}
  
  		// "Let preceding siblings be the preceding siblings of target, and let
  		// following siblings be the following siblings of target."
  		var precedingSiblings = [].slice.call(currentAncestor.childNodes, 0, getNodeIndex(target));
  		var followingSiblings = [].slice.call(currentAncestor.childNodes, 1 + getNodeIndex(target));
  
  		// "Indent preceding siblings."
  		indentNodes(precedingSiblings);
  
  		// "Indent following siblings."
  		indentNodes(followingSiblings);
  	}
  
  	// "Outdent original ancestor."
  	outdentNode(originalAncestor);
  }
  
  
  //@}
  ///// Toggling lists /////
  //@{
  
  function toggleLists(tagName) {
  	// "Record current overrides, and let overrides be the result."
  	var overrides = recordCurrentOverrides();
  
  	// "Let mode be "disable" if the selection's list state is tag name, and
  	// "enable" otherwise."
  	var mode = getSelectionListState() == tagName ? "disable" : "enable";
  
  	var range = getActiveRange();
  	tagName = tagName.toUpperCase();
  
  	// "Let other tag name be "ol" if tag name is "ul", and "ul" if tag name is
  	// "ol"."
  	var otherTagName = tagName == "OL" ? "UL" : "OL";
  
  	// "Let items be a list of all lis that are ancestor containers of the
  	// range's start and/or end node."
  	//
  	// It's annoying to get this in tree order using functional stuff without
  	// doing getDescendants(document), which is slow, so I do it imperatively.
  	var items = [];
  	(function(){
  		for (
  			var ancestorContainer = range.endContainer;
  			ancestorContainer != range.commonAncestorContainer;
  			ancestorContainer = ancestorContainer.parentNode
  		) {
  			if (isHtmlElement(ancestorContainer, "li")) {
  				items.unshift(ancestorContainer);
  			}
  		}
  		for (
  			var ancestorContainer = range.startContainer;
  			ancestorContainer;
  			ancestorContainer = ancestorContainer.parentNode
  		) {
  			if (isHtmlElement(ancestorContainer, "li")) {
  				items.unshift(ancestorContainer);
  			}
  		}
  	})();
  
  	// "For each item in items, normalize sublists of item."
  	items.forEach(normalizeSublists);
  
  	// "Block-extend the range, and let new range be the result."
  	var newRange = blockExtend(range);
  
  	// "If mode is "enable", then let lists to convert consist of every
  	// editable HTML element with local name other tag name that is contained
  	// in new range, and for every list in lists to convert:"
  	if (mode == "enable") {
  		getAllContainedNodes(newRange, function(node) {
  			return isEditable(node)
  				&& isHtmlElement(node, otherTagName);
  		}).forEach(function(list) {
  			// "If list's previousSibling or nextSibling is an editable HTML
  			// element with local name tag name:"
  			if ((isEditable(list.previousSibling) && isHtmlElement(list.previousSibling, tagName))
  			|| (isEditable(list.nextSibling) && isHtmlElement(list.nextSibling, tagName))) {
  				// "Let children be list's children."
  				var children = [].slice.call(list.childNodes);
  
  				// "Record the values of children, and let values be the
  				// result."
  				var values = recordValues(children);
  
  				// "Split the parent of children."
  				splitParent(children);
  
  				// "Wrap children, with sibling criteria returning true for an
  				// HTML element with local name tag name and false otherwise."
  				wrap(children, function(node) { return isHtmlElement(node, tagName) });
  
  				// "Restore the values from values."
  				restoreValues(values);
  
  			// "Otherwise, set the tag name of list to tag name."
  			} else {
  				setTagName(list, tagName);
  			}
  		});
  	}
  
  	// "Let node list be a list of nodes, initially empty."
  	//
  	// "For each node node contained in new range, if node is editable; the
  	// last member of node list (if any) is not an ancestor of node; node
  	// is not an indentation element; and either node is an ol or ul, or its
  	// parent is an ol or ul, or it is an allowed child of "li"; then append
  	// node to node list."
  	var nodeList = getContainedNodes(newRange, function(node) {
  		return isEditable(node)
  		&& !isIndentationElement(node)
  		&& (isHtmlElement(node, ["OL", "UL"])
  		|| isHtmlElement(node.parentNode, ["OL", "UL"])
  		|| isAllowedChild(node, "li"));
  	});
  
  	// "If mode is "enable", remove from node list any ol or ul whose parent is
  	// not also an ol or ul."
  	if (mode == "enable") {
  		nodeList = nodeList.filter(function(node) {
  			return !isHtmlElement(node, ["ol", "ul"])
  				|| isHtmlElement(node.parentNode, ["ol", "ul"]);
  		});
  	}
  
  	// "If mode is "disable", then while node list is not empty:"
  	if (mode == "disable") {
  		while (nodeList.length) {
  			// "Let sublist be an empty list of nodes."
  			var sublist = [];
  
  			// "Remove the first member from node list and append it to
  			// sublist."
  			sublist.push(nodeList.shift());
  
  			// "If the first member of sublist is an HTML element with local
  			// name tag name, outdent it and continue this loop from the
  			// beginning."
  			if (isHtmlElement(sublist[0], tagName)) {
  				outdentNode(sublist[0]);
  				continue;
  			}
  
  			// "While node list is not empty, and the first member of node list
  			// is the nextSibling of the last member of sublist and is not an
  			// HTML element with local name tag name, remove the first member
  			// from node list and append it to sublist."
  			while (nodeList.length
  			&& nodeList[0] == sublist[sublist.length - 1].nextSibling
  			&& !isHtmlElement(nodeList[0], tagName)) {
  				sublist.push(nodeList.shift());
  			}
  
  			// "Record the values of sublist, and let values be the result."
  			var values = recordValues(sublist);
  
  			// "Split the parent of sublist."
  			splitParent(sublist);
  
  			// "Fix disallowed ancestors of each member of sublist."
  			for (var i = 0; i < sublist.length; i++) {
  				fixDisallowedAncestors(sublist[i]);
  			}
  
  			// "Restore the values from values."
  			restoreValues(values);
  		}
  
  	// "Otherwise, while node list is not empty:"
  	} else {
  		while (nodeList.length) {
  			// "Let sublist be an empty list of nodes."
  			var sublist = [];
  
  			// "While either sublist is empty, or node list is not empty and
  			// its first member is the nextSibling of sublist's last member:"
  			while (!sublist.length
  			|| (nodeList.length
  			&& nodeList[0] == sublist[sublist.length - 1].nextSibling)) {
  				// "If node list's first member is a p or div, set the tag name
  				// of node list's first member to "li", and append the result
  				// to sublist. Remove the first member from node list."
  				if (isHtmlElement(nodeList[0], ["p", "div"])) {
  					sublist.push(setTagName(nodeList[0], "li"));
  					nodeList.shift();
  
  				// "Otherwise, if the first member of node list is an li or ol
  				// or ul, remove it from node list and append it to sublist."
  				} else if (isHtmlElement(nodeList[0], ["li", "ol", "ul"])) {
  					sublist.push(nodeList.shift());
  
  				// "Otherwise:"
  				} else {
  					// "Let nodes to wrap be a list of nodes, initially empty."
  					var nodesToWrap = [];
  
  					// "While nodes to wrap is empty, or node list is not empty
  					// and its first member is the nextSibling of nodes to
  					// wrap's last member and the first member of node list is
  					// an inline node and the last member of nodes to wrap is
  					// an inline node other than a br, remove the first member
  					// from node list and append it to nodes to wrap."
  					while (!nodesToWrap.length
  					|| (nodeList.length
  					&& nodeList[0] == nodesToWrap[nodesToWrap.length - 1].nextSibling
  					&& isInlineNode(nodeList[0])
  					&& isInlineNode(nodesToWrap[nodesToWrap.length - 1])
  					&& !isHtmlElement(nodesToWrap[nodesToWrap.length - 1], "br"))) {
  						nodesToWrap.push(nodeList.shift());
  					}
  
  					// "Wrap nodes to wrap, with new parent instructions
  					// returning the result of calling createElement("li") on
  					// the context object. Append the result to sublist."
  					sublist.push(wrap(nodesToWrap,
  						undefined,
  						function() { return document.createElement("li") }));
  				}
  			}
  
  			// "If sublist's first member's parent is an HTML element with
  			// local name tag name, or if every member of sublist is an ol or
  			// ul, continue this loop from the beginning."
  			if (isHtmlElement(sublist[0].parentNode, tagName)
  			|| sublist.every(function(node) { return isHtmlElement(node, ["ol", "ul"]) })) {
  				continue;
  			}
  
  			// "If sublist's first member's parent is an HTML element with
  			// local name other tag name:"
  			if (isHtmlElement(sublist[0].parentNode, otherTagName)) {
  				// "Record the values of sublist, and let values be the
  				// result."
  				var values = recordValues(sublist);
  
  				// "Split the parent of sublist."
  				splitParent(sublist);
  
  				// "Wrap sublist, with sibling criteria returning true for an
  				// HTML element with local name tag name and false otherwise,
  				// and new parent instructions returning the result of calling
  				// createElement(tag name) on the context object."
  				wrap(sublist,
  					function(node) { return isHtmlElement(node, tagName) },
  					function() { return document.createElement(tagName) });
  
  				// "Restore the values from values."
  				restoreValues(values);
  
  				// "Continue this loop from the beginning."
  				continue;
  			}
  
  			// "Wrap sublist, with sibling criteria returning true for an HTML
  			// element with local name tag name and false otherwise, and new
  			// parent instructions being the following:"
  			// . . .
  			// "Fix disallowed ancestors of the previous step's result."
  			fixDisallowedAncestors(wrap(sublist,
  				function(node) { return isHtmlElement(node, tagName) },
  				function() {
  					// "If sublist's first member's parent is not an editable
  					// simple indentation element, or sublist's first member's
  					// parent's previousSibling is not an editable HTML element
  					// with local name tag name, call createElement(tag name)
  					// on the context object and return the result."
  					if (!isEditable(sublist[0].parentNode)
  					|| !isSimpleIndentationElement(sublist[0].parentNode)
  					|| !isEditable(sublist[0].parentNode.previousSibling)
  					|| !isHtmlElement(sublist[0].parentNode.previousSibling, tagName)) {
  						return document.createElement(tagName);
  					}
  
  					// "Let list be sublist's first member's parent's
  					// previousSibling."
  					var list = sublist[0].parentNode.previousSibling;
  
  					// "Normalize sublists of list's lastChild."
  					normalizeSublists(list.lastChild);
  
  					// "If list's lastChild is not an editable HTML element
  					// with local name tag name, call createElement(tag name)
  					// on the context object, and append the result as the last
  					// child of list."
  					if (!isEditable(list.lastChild)
  					|| !isHtmlElement(list.lastChild, tagName)) {
  						list.appendChild(document.createElement(tagName));
  					}
  
  					// "Return the last child of list."
  					return list.lastChild;
  				}
  			));
  		}
  	}
  
  	// "Restore states and values from overrides."
  	restoreStatesAndValues(overrides);
  }
  
  
  //@}
  ///// Justifying the selection /////
  //@{
  
  function justifySelection(alignment) {
  	// "Record current overrides, and let overrides be the result."
  	var overrides = recordCurrentOverrides();
  
  	// "Block-extend the active range, and let new range be the result."
  	var newRange = blockExtend(globalRange);
  
  	// "Let element list be a list of all editable Elements contained in new
  	// range that either has an attribute in the HTML namespace whose local
  	// name is "align", or has a style attribute that sets "text-align", or is
  	// a center."
  	var elementList = getAllContainedNodes(newRange, function(node) {
  		return node.nodeType == Node.ELEMENT_NODE
  			&& isEditable(node)
  			// Ignoring namespaces here
  			&& (
  				node.hasAttribute("align")
  				|| node.style.textAlign != ""
  				|| isHtmlElement(node, "center")
  			);
  	});
  
  	// "For each element in element list:"
  	for (var i = 0; i < elementList.length; i++) {
  		var element = elementList[i];
  
  		// "If element has an attribute in the HTML namespace whose local name
  		// is "align", remove that attribute."
  		element.removeAttribute("align");
  
  		// "Unset the CSS property "text-align" on element, if it's set by a
  		// style attribute."
  		element.style.textAlign = "";
  		if (element.getAttribute("style") == "") {
  			element.removeAttribute("style");
  		}
  
  		// "If element is a div or span or center with no attributes, remove
  		// it, preserving its descendants."
  		if (isHtmlElement(element, ["div", "span", "center"])
  		&& !element.attributes.length) {
  			removePreservingDescendants(element);
  		}
  
  		// "If element is a center with one or more attributes, set the tag
  		// name of element to "div"."
  		if (isHtmlElement(element, "center")
  		&& element.attributes.length) {
  			setTagName(element, "div");
  		}
  	}
  
  	// "Block-extend the active range, and let new range be the result."
  	newRange = blockExtend(globalRange);
  
  	// "Let node list be a list of nodes, initially empty."
  	var nodeList = [];
  
  	// "For each node node contained in new range, append node to node list if
  	// the last member of node list (if any) is not an ancestor of node; node
  	// is editable; node is an allowed child of "div"; and node's alignment
  	// value is not alignment."
  	nodeList = getContainedNodes(newRange, function(node) {
  		return isEditable(node)
  			&& isAllowedChild(node, "div")
  			&& getAlignmentValue(node) != alignment;
  	});
  
  	// "While node list is not empty:"
  	while (nodeList.length) {
  		// "Let sublist be a list of nodes, initially empty."
  		var sublist = [];
  
  		// "Remove the first member of node list and append it to sublist."
  		sublist.push(nodeList.shift());
  
  		// "While node list is not empty, and the first member of node list is
  		// the nextSibling of the last member of sublist, remove the first
  		// member of node list and append it to sublist."
  		while (nodeList.length
  		&& nodeList[0] == sublist[sublist.length - 1].nextSibling) {
  			sublist.push(nodeList.shift());
  		}
  
  		// "Wrap sublist. Sibling criteria returns true for any div that has
  		// one or both of the following two attributes and no other attributes,
  		// and false otherwise:"
  		//
  		//   * "An align attribute whose value is an ASCII case-insensitive
  		//     match for alignment.
  		//   * "A style attribute which sets exactly one CSS property
  		//     (including unrecognized or invalid attributes), which is
  		//     "text-align", which is set to alignment.
  		//
  		// "New parent instructions are to call createElement("div") on the
  		// context object, then set its CSS property "text-align" to alignment
  		// and return the result."
  		wrap(sublist,
  			function(node) {
  				return isHtmlElement(node, "div")
  					&& [].every.call(node.attributes, function(attr) {
  						return (attr.name == "align" && attr.value.toLowerCase() == alignment)
  							|| (attr.name == "style" && node.style.length == 1 && node.style.textAlign == alignment);
  					});
  			},
  			function() {
  				var newParent = document.createElement("div");
  				newParent.setAttribute("style", "text-align: " + alignment);
  				return newParent;
  			}
  		);
  	}
  
  	// "Restore states and values from overrides."
  	restoreStatesAndValues(overrides);
  }
  
  
  //@}
  ///// Automatic linking /////
  //@{
  // "An autolinkable URL is a string of the following form:"
  var autolinkableUrlRegexp =
  	// "Either a string matching the scheme pattern from RFC 3986 section 3.1
  	// followed by the literal string ://, or the literal string mailto:;
  	// followed by"
  	//
  	// From the RFC: scheme      = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
  	"([a-zA-Z][a-zA-Z0-9+.-]*://|mailto:)"
  	// "Zero or more characters other than space characters; followed by"
  	+ "[^ \t\n\f\r]*"
  	// "A character that is not one of the ASCII characters !"'(),-.:;<>[]`{}."
  	+ "[^!\"'(),\\-.:;<>[\\]`{}]";
  
  // "A valid e-mail address is a string that matches the ABNF production 1*(
  // atext / "." ) "@" ldh-str *( "." ldh-str ) where atext is defined in RFC
  // 5322 section 3.2.3, and ldh-str is defined in RFC 1034 section 3.5."
  //
  // atext: ALPHA / DIGIT / "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" /
  // "/" / "=" / "?" / "^" / "_" / "`" / "{" / "|" / "}" / "~"
  //
  //<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
  //<let-dig-hyp> ::= <let-dig> | "-"
  //<let-dig> ::= <letter> | <digit>
  var validEmailRegexp =
  	"[a-zA-Z0-9!#$%&'*+\\-/=?^_`{|}~.]+@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*";
  
  function autolink(node, endOffset) {
  	// "While (node, end offset)'s previous equivalent point is not null, set
  	// it to its previous equivalent point."
  	while (getPreviousEquivalentPoint(node, endOffset)) {
  		var prev = getPreviousEquivalentPoint(node, endOffset);
  		node = prev[0];
  		endOffset = prev[1];
  	}
  
  	// "If node is not a Text node, or has an a ancestor, do nothing and abort
  	// these steps."
  	if (node.nodeType != Node.TEXT_NODE
  	|| getAncestors(node).some(function(ancestor) { return isHtmlElement(ancestor, "a") })) {
  		return;
  	}
  
  	// "Let search be the largest substring of node's data whose end is end
  	// offset and that contains no space characters."
  	var search = /[^ \t\n\f\r]*$/.exec(node.substringData(0, endOffset))[0];
  
  	// "If some substring of search is an autolinkable URL:"
  	if (new RegExp(autolinkableUrlRegexp).test(search)) {
  		// "While there is no substring of node's data ending at end offset
  		// that is an autolinkable URL, decrement end offset."
  		while (!(new RegExp(autolinkableUrlRegexp + "$").test(node.substringData(0, endOffset)))) {
  			endOffset--;
  		}
  
  		// "Let start offset be the start index of the longest substring of
  		// node's data that is an autolinkable URL ending at end offset."
  		var startOffset = new RegExp(autolinkableUrlRegexp + "$").exec(node.substringData(0, endOffset)).index;
  
  		// "Let href be the substring of node's data starting at start offset
  		// and ending at end offset."
  		var href = node.substringData(startOffset, endOffset - startOffset);
  
  	// "Otherwise, if some substring of search is a valid e-mail address:"
  	} else if (new RegExp(validEmailRegexp).test(search)) {
  		// "While there is no substring of node's data ending at end offset
  		// that is a valid e-mail address, decrement end offset."
  		while (!(new RegExp(validEmailRegexp + "$").test(node.substringData(0, endOffset)))) {
  			endOffset--;
  		}
  
  		// "Let start offset be the start index of the longest substring of
  		// node's data that is a valid e-mail address ending at end offset."
  		var startOffset = new RegExp(validEmailRegexp + "$").exec(node.substringData(0, endOffset)).index;
  
  		// "Let href be "mailto:" concatenated with the substring of node's
  		// data starting at start offset and ending at end offset."
  		var href = "mailto:" + node.substringData(startOffset, endOffset - startOffset);
  
  	// "Otherwise, do nothing and abort these steps."
  	} else {
  		return;
  	}
  
  	// "Let original range be the active range."
  	var originalRange = getActiveRange();
  
  	// "Create a new range with start (node, start offset) and end (node, end
  	// offset), and set the context object's selection's range to it."
  	var newRange = document.createRange();
  	newRange.setStart(node, startOffset);
  	newRange.setEnd(node, endOffset);
  	getSelection().removeAllRanges();
  	getSelection().addRange(newRange);
  	globalRange = newRange;
  
  	// "Call execCommand("createLink", false, href) on the context object."
  	myExecCommand("createLink", false, href);
  
  	// "Set the context object's selection's range to original range."
  	getSelection().removeAllRanges();
  	getSelection().addRange(originalRange);
  	globalRange = originalRange;
  }
  //@}
  ///// The delete command /////
  //@{
  commands["delete"] = {
  	action: function() {
  		// "If the active range is not collapsed, delete the selection and
  		// abort these steps."
  		if (!getActiveRange().collapsed) {
  			deleteSelection();
  			return;
  		}
  
  		// "Canonicalize whitespace at the active range's start."
  		canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);
  
  		// "Let node and offset be the active range's start node and offset."
  		var node = getActiveRange().startContainer;
  		var offset = getActiveRange().startOffset;
  
  		// "Repeat the following steps:"
  		while (true) {
  			// "If offset is zero and node's previousSibling is an editable
  			// invisible node, remove node's previousSibling from its parent."
  			if (offset == 0
  			&& isEditable(node.previousSibling)
  			&& isInvisible(node.previousSibling)) {
  				node.parentNode.removeChild(node.previousSibling);
  
  			// "Otherwise, if node has a child with index offset âˆ’ 1 and that
  			// child is an editable invisible node, remove that child from
  			// node, then subtract one from offset."
  			} else if (0 <= offset - 1
  			&& offset - 1 < node.childNodes.length
  			&& isEditable(node.childNodes[offset - 1])
  			&& isInvisible(node.childNodes[offset - 1])) {
  				node.removeChild(node.childNodes[offset - 1]);
  				offset--;
  
  			// "Otherwise, if offset is zero and node is an inline node, or if
  			// node is an invisible node, set offset to the index of node, then
  			// set node to its parent."
  			} else if ((offset == 0
  			&& isInlineNode(node))
  			|| isInvisible(node)) {
  				offset = getNodeIndex(node);
  				node = node.parentNode;
  
  			// "Otherwise, if node has a child with index offset âˆ’ 1 and that
  			// child is an editable a, remove that child from node, preserving
  			// its descendants. Then abort these steps."
  			} else if (0 <= offset - 1
  			&& offset - 1 < node.childNodes.length
  			&& isEditable(node.childNodes[offset - 1])
  			&& isHtmlElement(node.childNodes[offset - 1], "a")) {
  				removePreservingDescendants(node.childNodes[offset - 1]);
  				return;
  
  			// "Otherwise, if node has a child with index offset âˆ’ 1 and that
  			// child is not a block node or a br or an img, set node to that
  			// child, then set offset to the length of node."
  			} else if (0 <= offset - 1
  			&& offset - 1 < node.childNodes.length
  			&& !isBlockNode(node.childNodes[offset - 1])
  			&& !isHtmlElement(node.childNodes[offset - 1], ["br", "img"])) {
  				node = node.childNodes[offset - 1];
  				offset = getNodeLength(node);
  
  			// "Otherwise, break from this loop."
  			} else {
  				break;
  			}
  		}
  
  		// "If node is a Text node and offset is not zero, or if node is a
  		// block node that has a child with index offset âˆ’ 1 and that child is
  		// a br or hr or img:"
  		if ((node.nodeType == Node.TEXT_NODE
  		&& offset != 0)
  		|| (isBlockNode(node)
  		&& 0 <= offset - 1
  		&& offset - 1 < node.childNodes.length
  		&& isHtmlElement(node.childNodes[offset - 1], ["br", "hr", "img"]))) {
  			// "Call collapse(node, offset) on the context object's Selection."
  			getSelection().collapse(node, offset);
  			getActiveRange().setEnd(node, offset);
  
  			// "Call extend(node, offset âˆ’ 1) on the context object's
  			// Selection."
  			getSelection().extend(node, offset - 1);
  			getActiveRange().setStart(node, offset - 1);
  
  			// "Delete the selection."
  			deleteSelection();
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If node is an inline node, abort these steps."
  		if (isInlineNode(node)) {
  			return;
  		}
  
  		// "If node is an li or dt or dd and is the first child of its parent,
  		// and offset is zero:"
  		if (isHtmlElement(node, ["li", "dt", "dd"])
  		&& node == node.parentNode.firstChild
  		&& offset == 0) {
  			// "Let items be a list of all lis that are ancestors of node."
  			//
  			// Remember, must be in tree order.
  			var items = [];
  			for (var ancestor = node.parentNode; ancestor; ancestor = ancestor.parentNode) {
  				if (isHtmlElement(ancestor, "li")) {
  					items.unshift(ancestor);
  				}
  			}
  
  			// "Normalize sublists of each item in items."
  			for (var i = 0; i < items.length; i++) {
  				normalizeSublists(items[i]);
  			}
  
  			// "Record the values of the one-node list consisting of node, and
  			// let values be the result."
  			var values = recordValues([node]);
  
  			// "Split the parent of the one-node list consisting of node."
  			splitParent([node]);
  
  			// "Restore the values from values."
  			restoreValues(values);
  
  			// "If node is a dd or dt, and it is not an allowed child of any of
  			// its ancestors in the same editing host, set the tag name of node
  			// to the default single-line container name and let node be the
  			// result."
  			if (isHtmlElement(node, ["dd", "dt"])
  			&& getAncestors(node).every(function(ancestor) {
  				return !inSameEditingHost(node, ancestor)
  					|| !isAllowedChild(node, ancestor)
  			})) {
  				node = setTagName(node, defaultSingleLineContainerName);
  			}
  
  			// "Fix disallowed ancestors of node."
  			fixDisallowedAncestors(node);
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "Let start node equal node and let start offset equal offset."
  		var startNode = node;
  		var startOffset = offset;
  
  		// "Repeat the following steps:"
  		while (true) {
  			// "If start offset is zero, set start offset to the index of start
  			// node and then set start node to its parent."
  			if (startOffset == 0) {
  				startOffset = getNodeIndex(startNode);
  				startNode = startNode.parentNode;
  
  			// "Otherwise, if start node has an editable invisible child with
  			// index start offset minus one, remove it from start node and
  			// subtract one from start offset."
  			} else if (0 <= startOffset - 1
  			&& startOffset - 1 < startNode.childNodes.length
  			&& isEditable(startNode.childNodes[startOffset - 1])
  			&& isInvisible(startNode.childNodes[startOffset - 1])) {
  				startNode.removeChild(startNode.childNodes[startOffset - 1]);
  				startOffset--;
  
  			// "Otherwise, break from this loop."
  			} else {
  				break;
  			}
  		}
  
  		// "If offset is zero, and node has an editable ancestor container in
  		// the same editing host that's an indentation element:"
  		if (offset == 0
  		&& getAncestors(node).concat(node).filter(function(ancestor) {
  			return isEditable(ancestor)
  				&& inSameEditingHost(ancestor, node)
  				&& isIndentationElement(ancestor);
  		}).length) {
  			// "Block-extend the range whose start and end are both (node, 0),
  			// and let new range be the result."
  			var newRange = document.createRange();
  			newRange.setStart(node, 0);
  			newRange = blockExtend(newRange);
  
  			// "Let node list be a list of nodes, initially empty."
  			//
  			// "For each node current node contained in new range, append
  			// current node to node list if the last member of node list (if
  			// any) is not an ancestor of current node, and current node is
  			// editable but has no editable descendants."
  			var nodeList = getContainedNodes(newRange, function(currentNode) {
  				return isEditable(currentNode)
  					&& !hasEditableDescendants(currentNode);
  			});
  
  			// "Outdent each node in node list."
  			for (var i = 0; i < nodeList.length; i++) {
  				outdentNode(nodeList[i]);
  			}
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If the child of start node with index start offset is a table,
  		// abort these steps."
  		if (isHtmlElement(startNode.childNodes[startOffset], "table")) {
  			return;
  		}
  
  		// "If start node has a child with index start offset âˆ’ 1, and that
  		// child is a table:"
  		if (0 <= startOffset - 1
  		&& startOffset - 1 < startNode.childNodes.length
  		&& isHtmlElement(startNode.childNodes[startOffset - 1], "table")) {
  			// "Call collapse(start node, start offset âˆ’ 1) on the context
  			// object's Selection."
  			getSelection().collapse(startNode, startOffset - 1);
  			getActiveRange().setStart(startNode, startOffset - 1);
  
  			// "Call extend(start node, start offset) on the context object's
  			// Selection."
  			getSelection().extend(startNode, startOffset);
  			getActiveRange().setEnd(startNode, startOffset);
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If offset is zero; and either the child of start node with index
  		// start offset minus one is an hr, or the child is a br whose
  		// previousSibling is either a br or not an inline node:"
  		if (offset == 0
  		&& (isHtmlElement(startNode.childNodes[startOffset - 1], "hr")
  			|| (
  				isHtmlElement(startNode.childNodes[startOffset - 1], "br")
  				&& (
  					isHtmlElement(startNode.childNodes[startOffset - 1].previousSibling, "br")
  					|| !isInlineNode(startNode.childNodes[startOffset - 1].previousSibling)
  				)
  			)
  		)) {
  			// "Call collapse(start node, start offset âˆ’ 1) on the context
  			// object's Selection."
  			getSelection().collapse(startNode, startOffset - 1);
  			getActiveRange().setStart(startNode, startOffset - 1);
  
  			// "Call extend(start node, start offset) on the context object's
  			// Selection."
  			getSelection().extend(startNode, startOffset);
  			getActiveRange().setEnd(startNode, startOffset);
  
  			// "Delete the selection."
  			deleteSelection();
  
  			// "Call collapse(node, offset) on the Selection."
  			getSelection().collapse(node, offset);
  			getActiveRange().setStart(node, offset);
  			getActiveRange().collapse(true);
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If the child of start node with index start offset is an li or dt
  		// or dd, and that child's firstChild is an inline node, and start
  		// offset is not zero:"
  		if (isHtmlElement(startNode.childNodes[startOffset], ["li", "dt", "dd"])
  		&& isInlineNode(startNode.childNodes[startOffset].firstChild)
  		&& startOffset != 0) {
  			// "Let previous item be the child of start node with index start
  			// offset minus one."
  			var previousItem = startNode.childNodes[startOffset - 1];
  
  			// "If previous item's lastChild is an inline node other than a br,
  			// call createElement("br") on the context object and append the
  			// result as the last child of previous item."
  			if (isInlineNode(previousItem.lastChild)
  			&& !isHtmlElement(previousItem.lastChild, "br")) {
  				previousItem.appendChild(document.createElement("br"));
  			}
  
  			// "If previous item's lastChild is an inline node, call
  			// createElement("br") on the context object and append the result
  			// as the last child of previous item."
  			if (isInlineNode(previousItem.lastChild)) {
  				previousItem.appendChild(document.createElement("br"));
  			}
  		}
  
  		// "If start node's child with index start offset is an li or dt or dd,
  		// and that child's previousSibling is also an li or dt or dd:"
  		if (isHtmlElement(startNode.childNodes[startOffset], ["li", "dt", "dd"])
  		&& isHtmlElement(startNode.childNodes[startOffset].previousSibling, ["li", "dt", "dd"])) {
  			// "Call cloneRange() on the active range, and let original range
  			// be the result."
  			//
  			// We need to add it to extraRanges so it will actually get updated
  			// when moving preserving ranges.
  			var originalRange = getActiveRange().cloneRange();
  			extraRanges.push(originalRange);
  
  			// "Set start node to its child with index start offset âˆ’ 1."
  			startNode = startNode.childNodes[startOffset - 1];
  
  			// "Set start offset to start node's length."
  			startOffset = getNodeLength(startNode);
  
  			// "Set node to start node's nextSibling."
  			node = startNode.nextSibling;
  
  			// "Call collapse(start node, start offset) on the context object's
  			// Selection."
  			getSelection().collapse(startNode, startOffset);
  			getActiveRange().setStart(startNode, startOffset);
  
  			// "Call extend(node, 0) on the context object's Selection."
  			getSelection().extend(node, 0);
  			getActiveRange().setEnd(node, 0);
  
  			// "Delete the selection."
  			deleteSelection();
  
  			// "Call removeAllRanges() on the context object's Selection."
  			getSelection().removeAllRanges();
  
  			// "Call addRange(original range) on the context object's
  			// Selection."
  			getSelection().addRange(originalRange);
  			getActiveRange().setStart(originalRange.startContainer, originalRange.startOffset);
  			getActiveRange().setEnd(originalRange.endContainer, originalRange.endOffset);
  
  			// "Abort these steps."
  			extraRanges.pop();
  			return;
  		}
  
  		// "While start node has a child with index start offset minus one:"
  		while (0 <= startOffset - 1
  		&& startOffset - 1 < startNode.childNodes.length) {
  			// "If start node's child with index start offset minus one is
  			// editable and invisible, remove it from start node, then subtract
  			// one from start offset."
  			if (isEditable(startNode.childNodes[startOffset - 1])
  			&& isInvisible(startNode.childNodes[startOffset - 1])) {
  				startNode.removeChild(startNode.childNodes[startOffset - 1]);
  				startOffset--;
  
  			// "Otherwise, set start node to its child with index start offset
  			// minus one, then set start offset to the length of start node."
  			} else {
  				startNode = startNode.childNodes[startOffset - 1];
  				startOffset = getNodeLength(startNode);
  			}
  		}
  
  		// "Call collapse(start node, start offset) on the context object's
  		// Selection."
  		getSelection().collapse(startNode, startOffset);
  		getActiveRange().setStart(startNode, startOffset);
  
  		// "Call extend(node, offset) on the context object's Selection."
  		getSelection().extend(node, offset);
  		getActiveRange().setEnd(node, offset);
  
  		// "Delete the selection, with direction "backward"."
  		deleteSelection({direction: "backward"});
  	}
  };
  
  //@}
  ///// The formatBlock command /////
  //@{
  // "A formattable block name is "address", "dd", "div", "dt", "h1", "h2", "h3",
  // "h4", "h5", "h6", "p", or "pre"."
  var formattableBlockNames = ["address", "dd", "div", "dt", "h1", "h2", "h3",
  	"h4", "h5", "h6", "p", "pre"];
  
  commands.formatblock = {
  	action: function(value) {
  		// "If value begins with a "<" character and ends with a ">" character,
  		// remove the first and last characters from it."
  		if (/^<.*>$/.test(value)) {
  			value = value.slice(1, -1);
  		}
  
  		// "Let value be converted to ASCII lowercase."
  		value = value.toLowerCase();
  
  		// "If value is not a formattable block name, abort these steps and do
  		// nothing."
  		if (formattableBlockNames.indexOf(value) == -1) {
  			return;
  		}
  
  		// "Record current overrides, and let overrides be the result."
  		var overrides = recordCurrentOverrides();
  
  		// "Block-extend the active range, and let new range be the result."
  		var newRange = blockExtend(getActiveRange());
  
  		// "Let node list be an empty list of nodes."
  		//
  		// "For each node node contained in new range, append node to node list
  		// if it is editable, the last member of original node list (if any) is
  		// not an ancestor of node, node is either a non-list single-line
  		// container or an allowed child of "p" or a dd or dt, and node is not
  		// the ancestor of a prohibited paragraph child."
  		var nodeList = getContainedNodes(newRange, function(node) {
  			return isEditable(node)
  				&& (isNonListSingleLineContainer(node)
  				|| isAllowedChild(node, "p")
  				|| isHtmlElement(node, ["dd", "dt"]))
  				&& !getDescendants(node).some(isProhibitedParagraphChild);
  		});
  
  		// "Record the values of node list, and let values be the result."
  		var values = recordValues(nodeList);
  
  		// "For each node in node list, while node is the descendant of an
  		// editable HTML element in the same editing host, whose local name is
  		// a formattable block name, and which is not the ancestor of a
  		// prohibited paragraph child, split the parent of the one-node list
  		// consisting of node."
  		for (var i = 0; i < nodeList.length; i++) {
  			var node = nodeList[i];
  			while (getAncestors(node).some(function(ancestor) {
  				return isEditable(ancestor)
  					&& inSameEditingHost(ancestor, node)
  					&& isHtmlElement(ancestor, formattableBlockNames)
  					&& !getDescendants(ancestor).some(isProhibitedParagraphChild);
  			})) {
  				splitParent([node]);
  			}
  		}
  
  		// "Restore the values from values."
  		restoreValues(values);
  
  		// "While node list is not empty:"
  		while (nodeList.length) {
  			var sublist;
  
  			// "If the first member of node list is a single-line
  			// container:"
  			if (isSingleLineContainer(nodeList[0])) {
  				// "Let sublist be the children of the first member of node
  				// list."
  				sublist = [].slice.call(nodeList[0].childNodes);
  
  				// "Record the values of sublist, and let values be the
  				// result."
  				var values = recordValues(sublist);
  
  				// "Remove the first member of node list from its parent,
  				// preserving its descendants."
  				removePreservingDescendants(nodeList[0]);
  
  				// "Restore the values from values."
  				restoreValues(values);
  
  				// "Remove the first member from node list."
  				nodeList.shift();
  
  			// "Otherwise:"
  			} else {
  				// "Let sublist be an empty list of nodes."
  				sublist = [];
  
  				// "Remove the first member of node list and append it to
  				// sublist."
  				sublist.push(nodeList.shift());
  
  				// "While node list is not empty, and the first member of
  				// node list is the nextSibling of the last member of
  				// sublist, and the first member of node list is not a
  				// single-line container, and the last member of sublist is
  				// not a br, remove the first member of node list and
  				// append it to sublist."
  				while (nodeList.length
  				&& nodeList[0] == sublist[sublist.length - 1].nextSibling
  				&& !isSingleLineContainer(nodeList[0])
  				&& !isHtmlElement(sublist[sublist.length - 1], "BR")) {
  					sublist.push(nodeList.shift());
  				}
  			}
  
  			// "Wrap sublist. If value is "div" or "p", sibling criteria
  			// returns false; otherwise it returns true for an HTML element
  			// with local name value and no attributes, and false otherwise.
  			// New parent instructions return the result of running
  			// createElement(value) on the context object. Then fix disallowed
  			// ancestors of the result."
  			fixDisallowedAncestors(wrap(sublist,
  				["div", "p"].indexOf(value) == - 1
  					? function(node) { return isHtmlElement(node, value) && !node.attributes.length }
  					: function() { return false },
  				function() { return document.createElement(value) }));
  		}
  
  		// "Restore states and values from overrides."
  		restoreStatesAndValues(overrides);
  	}, indeterm: function() {
  		// "If the active range is null, return false."
  		if (!getActiveRange()) {
  			return false;
  		}
  
  		// "Block-extend the active range, and let new range be the result."
  		var newRange = blockExtend(getActiveRange());
  
  		// "Let node list be all visible editable nodes that are contained in
  		// new range and have no children."
  		var nodeList = getAllContainedNodes(newRange, function(node) {
  			return isVisible(node)
  				&& isEditable(node)
  				&& !node.hasChildNodes();
  		});
  
  		// "If node list is empty, return false."
  		if (!nodeList.length) {
  			return false;
  		}
  
  		// "Let type be null."
  		var type = null;
  
  		// "For each node in node list:"
  		for (var i = 0; i < nodeList.length; i++) {
  			var node = nodeList[i];
  
  			// "While node's parent is editable and in the same editing host as
  			// node, and node is not an HTML element whose local name is a
  			// formattable block name, set node to its parent."
  			while (isEditable(node.parentNode)
  			&& inSameEditingHost(node, node.parentNode)
  			&& !isHtmlElement(node, formattableBlockNames)) {
  				node = node.parentNode;
  			}
  
  			// "Let current type be the empty string."
  			var currentType = "";
  
  			// "If node is an editable HTML element whose local name is a
  			// formattable block name, and node is not the ancestor of a
  			// prohibited paragraph child, set current type to node's local
  			// name."
  			if (isEditable(node)
  			&& isHtmlElement(node, formattableBlockNames)
  			&& !getDescendants(node).some(isProhibitedParagraphChild)) {
  				currentType = node.tagName;
  			}
  
  			// "If type is null, set type to current type."
  			if (type === null) {
  				type = currentType;
  
  			// "Otherwise, if type does not equal current type, return true."
  			} else if (type != currentType) {
  				return true;
  			}
  		}
  
  		// "Return false."
  		return false;
  	}, value: function() {
  		// "If the active range is null, return the empty string."
  		if (!getActiveRange()) {
  			return "";
  		}
  
  		// "Block-extend the active range, and let new range be the result."
  		var newRange = blockExtend(getActiveRange());
  
  		// "Let node be the first visible editable node that is contained in
  		// new range and has no children. If there is no such node, return the
  		// empty string."
  		var nodes = getAllContainedNodes(newRange, function(node) {
  			return isVisible(node)
  				&& isEditable(node)
  				&& !node.hasChildNodes();
  		});
  		if (!nodes.length) {
  			return "";
  		}
  		var node = nodes[0];
  
  		// "While node's parent is editable and in the same editing host as
  		// node, and node is not an HTML element whose local name is a
  		// formattable block name, set node to its parent."
  		while (isEditable(node.parentNode)
  		&& inSameEditingHost(node, node.parentNode)
  		&& !isHtmlElement(node, formattableBlockNames)) {
  			node = node.parentNode;
  		}
  
  		// "If node is an editable HTML element whose local name is a
  		// formattable block name, and node is not the ancestor of a prohibited
  		// paragraph child, return node's local name, converted to ASCII
  		// lowercase."
  		if (isEditable(node)
  		&& isHtmlElement(node, formattableBlockNames)
  		&& !getDescendants(node).some(isProhibitedParagraphChild)) {
  			return node.tagName.toLowerCase();
  		}
  
  		// "Return the empty string."
  		return "";
  	}
  };
  
  //@}
  ///// The forwardDelete command /////
  //@{
  commands.forwarddelete = {
  	action: function() {
  		// "If the active range is not collapsed, delete the selection and
  		// abort these steps."
  		if (!getActiveRange().collapsed) {
  			deleteSelection();
  			return;
  		}
  
  		// "Canonicalize whitespace at the active range's start."
  		canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);
  
  		// "Let node and offset be the active range's start node and offset."
  		var node = getActiveRange().startContainer;
  		var offset = getActiveRange().startOffset;
  
  		// "Repeat the following steps:"
  		while (true) {
  			// "If offset is the length of node and node's nextSibling is an
  			// editable invisible node, remove node's nextSibling from its
  			// parent."
  			if (offset == getNodeLength(node)
  			&& isEditable(node.nextSibling)
  			&& isInvisible(node.nextSibling)) {
  				node.parentNode.removeChild(node.nextSibling);
  
  			// "Otherwise, if node has a child with index offset and that child
  			// is an editable invisible node, remove that child from node."
  			} else if (offset < node.childNodes.length
  			&& isEditable(node.childNodes[offset])
  			&& isInvisible(node.childNodes[offset])) {
  				node.removeChild(node.childNodes[offset]);
  
  			// "Otherwise, if offset is the length of node and node is an
  			// inline node, or if node is invisible, set offset to one plus the
  			// index of node, then set node to its parent."
  			} else if ((offset == getNodeLength(node)
  			&& isInlineNode(node))
  			|| isInvisible(node)) {
  				offset = 1 + getNodeIndex(node);
  				node = node.parentNode;
  
  			// "Otherwise, if node has a child with index offset and that child
  			// is neither a block node nor a br nor an img nor a collapsed
  			// block prop, set node to that child, then set offset to zero."
  			} else if (offset < node.childNodes.length
  			&& !isBlockNode(node.childNodes[offset])
  			&& !isHtmlElement(node.childNodes[offset], ["br", "img"])
  			&& !isCollapsedBlockProp(node.childNodes[offset])) {
  				node = node.childNodes[offset];
  				offset = 0;
  
  			// "Otherwise, break from this loop."
  			} else {
  				break;
  			}
  		}
  
  		// "If node is a Text node and offset is not node's length:"
  		if (node.nodeType == Node.TEXT_NODE
  		&& offset != getNodeLength(node)) {
  			// "Let end offset be offset plus one."
  			var endOffset = offset + 1;
  
  			// "While end offset is not node's length and the end offsetth
  			// element of node's data has general category M when interpreted
  			// as a Unicode code point, add one to end offset."
  			//
  			// TODO: Not even going to try handling anything beyond the most
  			// basic combining marks, since I couldn't find a good list.  I
  			// special-case a few Hebrew diacritics too to test basic coverage
  			// of non-Latin stuff.
  			while (endOffset != node.length
  			&& /^[\u0300-\u036f\u0591-\u05bd\u05c1\u05c2]$/.test(node.data[endOffset])) {
  				endOffset++;
  			}
  
  			// "Call collapse(node, offset) on the context object's Selection."
  			getSelection().collapse(node, offset);
  			getActiveRange().setStart(node, offset);
  
  			// "Call extend(node, end offset) on the context object's
  			// Selection."
  			getSelection().extend(node, endOffset);
  			getActiveRange().setEnd(node, endOffset);
  
  			// "Delete the selection."
  			deleteSelection();
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If node is an inline node, abort these steps."
  		if (isInlineNode(node)) {
  			return;
  		}
  
  		// "If node has a child with index offset and that child is a br or hr
  		// or img, but is not a collapsed block prop:"
  		if (offset < node.childNodes.length
  		&& isHtmlElement(node.childNodes[offset], ["br", "hr", "img"])
  		&& !isCollapsedBlockProp(node.childNodes[offset])) {
  			// "Call collapse(node, offset) on the context object's Selection."
  			getSelection().collapse(node, offset);
  			getActiveRange().setStart(node, offset);
  
  			// "Call extend(node, offset + 1) on the context object's
  			// Selection."
  			getSelection().extend(node, offset + 1);
  			getActiveRange().setEnd(node, offset + 1);
  
  			// "Delete the selection."
  			deleteSelection();
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "Let end node equal node and let end offset equal offset."
  		var endNode = node;
  		var endOffset = offset;
  
  		// "If end node has a child with index end offset, and that child is a
  		// collapsed block prop, add one to end offset."
  		if (endOffset < endNode.childNodes.length
  		&& isCollapsedBlockProp(endNode.childNodes[endOffset])) {
  			endOffset++;
  		}
  
  		// "Repeat the following steps:"
  		while (true) {
  			// "If end offset is the length of end node, set end offset to one
  			// plus the index of end node and then set end node to its parent."
  			if (endOffset == getNodeLength(endNode)) {
  				endOffset = 1 + getNodeIndex(endNode);
  				endNode = endNode.parentNode;
  
  			// "Otherwise, if end node has a an editable invisible child with
  			// index end offset, remove it from end node."
  			} else if (endOffset < endNode.childNodes.length
  			&& isEditable(endNode.childNodes[endOffset])
  			&& isInvisible(endNode.childNodes[endOffset])) {
  				endNode.removeChild(endNode.childNodes[endOffset]);
  
  			// "Otherwise, break from this loop."
  			} else {
  				break;
  			}
  		}
  
  		// "If the child of end node with index end offset minus one is a
  		// table, abort these steps."
  		if (isHtmlElement(endNode.childNodes[endOffset - 1], "table")) {
  			return;
  		}
  
  		// "If the child of end node with index end offset is a table:"
  		if (isHtmlElement(endNode.childNodes[endOffset], "table")) {
  			// "Call collapse(end node, end offset) on the context object's
  			// Selection."
  			getSelection().collapse(endNode, endOffset);
  			getActiveRange().setStart(endNode, endOffset);
  
  			// "Call extend(end node, end offset + 1) on the context object's
  			// Selection."
  			getSelection().extend(endNode, endOffset + 1);
  			getActiveRange().setEnd(endNode, endOffset + 1);
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If offset is the length of node, and the child of end node with
  		// index end offset is an hr or br:"
  		if (offset == getNodeLength(node)
  		&& isHtmlElement(endNode.childNodes[endOffset], ["br", "hr"])) {
  			// "Call collapse(end node, end offset) on the context object's
  			// Selection."
  			getSelection().collapse(endNode, endOffset);
  			getActiveRange().setStart(endNode, endOffset);
  
  			// "Call extend(end node, end offset + 1) on the context object's
  			// Selection."
  			getSelection().extend(endNode, endOffset + 1);
  			getActiveRange().setEnd(endNode, endOffset + 1);
  
  			// "Delete the selection."
  			deleteSelection();
  
  			// "Call collapse(node, offset) on the Selection."
  			getSelection().collapse(node, offset);
  			getActiveRange().setStart(node, offset);
  			getActiveRange().collapse(true);
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "While end node has a child with index end offset:"
  		while (endOffset < endNode.childNodes.length) {
  			// "If end node's child with index end offset is editable and
  			// invisible, remove it from end node."
  			if (isEditable(endNode.childNodes[endOffset])
  			&& isInvisible(endNode.childNodes[endOffset])) {
  				endNode.removeChild(endNode.childNodes[endOffset]);
  
  			// "Otherwise, set end node to its child with index end offset and
  			// set end offset to zero."
  			} else {
  				endNode = endNode.childNodes[endOffset];
  				endOffset = 0;
  			}
  		}
  
  		// "Call collapse(node, offset) on the context object's Selection."
  		getSelection().collapse(node, offset);
  		getActiveRange().setStart(node, offset);
  
  		// "Call extend(end node, end offset) on the context object's
  		// Selection."
  		getSelection().extend(endNode, endOffset);
  		getActiveRange().setEnd(endNode, endOffset);
  
  		// "Delete the selection."
  		deleteSelection();
  	}
  };
  
  //@}
  ///// The indent command /////
  //@{
  commands.indent = {
  	action: function() {
  		// "Record current overrides, and let overrides be the result."
  		var overrides = recordCurrentOverrides();
  
  		// "Let items be a list of all lis that are ancestor containers of the
  		// active range's start and/or end node."
  		//
  		// Has to be in tree order, remember!
  		var items = [];
  		for (var node = getActiveRange().endContainer; node != getActiveRange().commonAncestorContainer; node = node.parentNode) {
  			if (isHtmlElement(node, "LI")) {
  				items.unshift(node);
  			}
  		}
  		for (var node = getActiveRange().startContainer; node != getActiveRange().commonAncestorContainer; node = node.parentNode) {
  			if (isHtmlElement(node, "LI")) {
  				items.unshift(node);
  			}
  		}
  		for (var node = getActiveRange().commonAncestorContainer; node; node = node.parentNode) {
  			if (isHtmlElement(node, "LI")) {
  				items.unshift(node);
  			}
  		}
  
  		// "For each item in items, normalize sublists of item."
  		for (var i = 0; i < items.length; i++) {
  			normalizeSublists(items[i]);
  		}
  
  		// "Block-extend the active range, and let new range be the result."
  		var newRange = blockExtend(getActiveRange());
  
  		// "Let node list be a list of nodes, initially empty."
  		var nodeList = [];
  
  		// "For each node node contained in new range, if node is editable and
  		// is an allowed child of "div" or "ol" and if the last member of node
  		// list (if any) is not an ancestor of node, append node to node list."
  		nodeList = getContainedNodes(newRange, function(node) {
  			return isEditable(node)
  				&& (isAllowedChild(node, "div")
  				|| isAllowedChild(node, "ol"));
  		});
  
  		// "If the first visible member of node list is an li whose parent is
  		// an ol or ul:"
  		if (isHtmlElement(nodeList.filter(isVisible)[0], "li")
  		&& isHtmlElement(nodeList.filter(isVisible)[0].parentNode, ["ol", "ul"])) {
  			// "Let sibling be node list's first visible member's
  			// previousSibling."
  			var sibling = nodeList.filter(isVisible)[0].previousSibling;
  
  			// "While sibling is invisible, set sibling to its
  			// previousSibling."
  			while (isInvisible(sibling)) {
  				sibling = sibling.previousSibling;
  			}
  
  			// "If sibling is an li, normalize sublists of sibling."
  			if (isHtmlElement(sibling, "li")) {
  				normalizeSublists(sibling);
  			}
  		}
  
  		// "While node list is not empty:"
  		while (nodeList.length) {
  			// "Let sublist be a list of nodes, initially empty."
  			var sublist = [];
  
  			// "Remove the first member of node list and append it to sublist."
  			sublist.push(nodeList.shift());
  
  			// "While the first member of node list is the nextSibling of the
  			// last member of sublist, remove the first member of node list and
  			// append it to sublist."
  			while (nodeList.length
  			&& nodeList[0] == sublist[sublist.length - 1].nextSibling) {
  				sublist.push(nodeList.shift());
  			}
  
  			// "Indent sublist."
  			indentNodes(sublist);
  		}
  
  		// "Restore states and values from overrides."
  		restoreStatesAndValues(overrides);
  	}
  };
  
  //@}
  ///// The insertHorizontalRule command /////
  //@{
  commands.inserthorizontalrule = {
  	action: function() {
  		// "Let start node, start offset, end node, and end offset be the
  		// active range's start and end nodes and offsets."
  		var startNode = getActiveRange().startContainer;
  		var startOffset = getActiveRange().startOffset;
  		var endNode = getActiveRange().endContainer;
  		var endOffset = getActiveRange().endOffset;
  
  		// "While start offset is 0 and start node's parent is not null, set
  		// start offset to start node's index, then set start node to its
  		// parent."
  		while (startOffset == 0
  		&& startNode.parentNode) {
  			startOffset = getNodeIndex(startNode);
  			startNode = startNode.parentNode;
  		}
  
  		// "While end offset is end node's length, and end node's parent is not
  		// null, set end offset to one plus end node's index, then set end node
  		// to its parent."
  		while (endOffset == getNodeLength(endNode)
  		&& endNode.parentNode) {
  			endOffset = 1 + getNodeIndex(endNode);
  			endNode = endNode.parentNode;
  		}
  
  		// "Call collapse(start node, start offset) on the context object's
  		// Selection."
  		getSelection().collapse(startNode, startOffset);
  		getActiveRange().setStart(startNode, startOffset);
  
  		// "Call extend(end node, end offset) on the context object's
  		// Selection."
  		getSelection().extend(endNode, endOffset);
  		getActiveRange().setEnd(endNode, endOffset);
  
  		// "Delete the selection, with block merging false."
  		deleteSelection({blockMerging: false});
  
  		// "If the active range's start node is neither editable nor an editing
  		// host, abort these steps."
  		if (!isEditable(getActiveRange().startContainer)
  		&& !isEditingHost(getActiveRange().startContainer)) {
  			return;
  		}
  
  		// "If the active range's start node is a Text node and its start
  		// offset is zero, call collapse() on the context object's Selection,
  		// with first argument the active range's start node's parent and
  		// second argument the active range's start node's index."
  		if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
  		&& getActiveRange().startOffset == 0) {
  			var newNode = getActiveRange().startContainer.parentNode;
  			var newOffset = getNodeIndex(getActiveRange().startContainer);
  			getSelection().collapse(newNode, newOffset);
  			getActiveRange().setStart(newNode, newOffset);
  			getActiveRange().collapse(true);
  		}
  
  		// "If the active range's start node is a Text node and its start
  		// offset is the length of its start node, call collapse() on the
  		// context object's Selection, with first argument the active range's
  		// start node's parent, and the second argument one plus the active
  		// range's start node's index."
  		if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
  		&& getActiveRange().startOffset == getNodeLength(getActiveRange().startContainer)) {
  			var newNode = getActiveRange().startContainer.parentNode;
  			var newOffset = 1 + getNodeIndex(getActiveRange().startContainer);
  			getSelection().collapse(newNode, newOffset);
  			getActiveRange().setStart(newNode, newOffset);
  			getActiveRange().collapse(true);
  		}
  
  		// "Let hr be the result of calling createElement("hr") on the
  		// context object."
  		var hr = document.createElement("hr");
  
  		// "Run insertNode(hr) on the active range."
  		getActiveRange().insertNode(hr);
  
  		// "Fix disallowed ancestors of hr."
  		fixDisallowedAncestors(hr);
  
  		// "Run collapse() on the context object's Selection, with first
  		// argument hr's parent and the second argument equal to one plus hr's
  		// index."
  		getSelection().collapse(hr.parentNode, 1 + getNodeIndex(hr));
  		getActiveRange().setStart(hr.parentNode, 1 + getNodeIndex(hr));
  		getActiveRange().collapse(true);
  	}
  };
  
  //@}
  ///// The insertHTML command /////
  //@{
  commands.inserthtml = {
  	action: function(value) {
  		// "Delete the selection."
  		deleteSelection();
  
  		// "If the active range's start node is neither editable nor an editing
  		// host, abort these steps."
  		if (!isEditable(getActiveRange().startContainer)
  		&& !isEditingHost(getActiveRange().startContainer)) {
  			return;
  		}
  
  		// "Let frag be the result of calling createContextualFragment(value)
  		// on the active range."
  		var frag = getActiveRange().createContextualFragment(value);
  
  		// "Let last child be the lastChild of frag."
  		var lastChild = frag.lastChild;
  
  		// "If last child is null, abort these steps."
  		if (!lastChild) {
  			return;
  		}
  
  		// "Let descendants be all descendants of frag."
  		var descendants = getDescendants(frag);
  
  		// "If the active range's start node is a block node:"
  		if (isBlockNode(getActiveRange().startContainer)) {
  			// "Let collapsed block props be all editable collapsed block prop
  			// children of the active range's start node that have index
  			// greater than or equal to the active range's start offset."
  			//
  			// "For each node in collapsed block props, remove node from its
  			// parent."
  			[].filter.call(getActiveRange().startContainer.childNodes, function(node) {
  				return isEditable(node)
  					&& isCollapsedBlockProp(node)
  					&& getNodeIndex(node) >= getActiveRange().startOffset;
  			}).forEach(function(node) {
  				node.parentNode.removeChild(node);
  			});
  		}
  
  		// "Call insertNode(frag) on the active range."
  		getActiveRange().insertNode(frag);
  
  		// "If the active range's start node is a block node with no visible
  		// children, call createElement("br") on the context object and append
  		// the result as the last child of the active range's start node."
  		if (isBlockNode(getActiveRange().startContainer)
  		&& ![].some.call(getActiveRange().startContainer.childNodes, isVisible)) {
  			getActiveRange().startContainer.appendChild(document.createElement("br"));
  		}
  
  		// "Call collapse() on the context object's Selection, with last
  		// child's parent as the first argument and one plus its index as the
  		// second."
  		getActiveRange().setStart(lastChild.parentNode, 1 + getNodeIndex(lastChild));
  		getActiveRange().setEnd(lastChild.parentNode, 1 + getNodeIndex(lastChild));
  
  		// "Fix disallowed ancestors of each member of descendants."
  		for (var i = 0; i < descendants.length; i++) {
  			fixDisallowedAncestors(descendants[i]);
  		}
  	}
  };
  
  //@}
  ///// The insertImage command /////
  //@{
  commands.insertimage = {
  	action: function(value) {
  		// "If value is the empty string, abort these steps and do nothing."
  		if (value === "") {
  			return;
  		}
  
  		// "Delete the selection, with strip wrappers false."
  		deleteSelection({stripWrappers: false});
  
  		// "Let range be the active range."
  		var range = getActiveRange();
  
  		// "If the active range's start node is neither editable nor an editing
  		// host, abort these steps."
  		if (!isEditable(getActiveRange().startContainer)
  		&& !isEditingHost(getActiveRange().startContainer)) {
  			return;
  		}
  
  		// "If range's start node is a block node whose sole child is a br, and
  		// its start offset is 0, remove its start node's child from it."
  		if (isBlockNode(range.startContainer)
  		&& range.startContainer.childNodes.length == 1
  		&& isHtmlElement(range.startContainer.firstChild, "br")
  		&& range.startOffset == 0) {
  			range.startContainer.removeChild(range.startContainer.firstChild);
  		}
  
  		// "Let img be the result of calling createElement("img") on the
  		// context object."
  		var img = document.createElement("img");
  
  		// "Run setAttribute("src", value) on img."
  		img.setAttribute("src", value);
  
  		// "Run insertNode(img) on the range."
  		range.insertNode(img);
  
  		// "Run collapse() on the Selection, with first argument equal to the
  		// parent of img and the second argument equal to one plus the index of
  		// img."
  		//
  		// Not everyone actually supports collapse(), so we do it manually
  		// instead.  Also, we need to modify the actual range we're given as
  		// well, for the sake of autoimplementation.html's range-filling-in.
  		range.setStart(img.parentNode, 1 + getNodeIndex(img));
  		range.setEnd(img.parentNode, 1 + getNodeIndex(img));
  		getSelection().removeAllRanges();
  		getSelection().addRange(range);
  
  		// IE adds width and height attributes for some reason, so remove those
  		// to actually do what the spec says.
  		img.removeAttribute("width");
  		img.removeAttribute("height");
  	}
  };
  
  //@}
  ///// The insertLineBreak command /////
  //@{
  commands.insertlinebreak = {
  	action: function(value) {
  		// "Delete the selection, with strip wrappers false."
  		deleteSelection({stripWrappers: false});
  
  		// "If the active range's start node is neither editable nor an editing
  		// host, abort these steps."
  		if (!isEditable(getActiveRange().startContainer)
  		&& !isEditingHost(getActiveRange().startContainer)) {
  			return;
  		}
  
  		// "If the active range's start node is an Element, and "br" is not an
  		// allowed child of it, abort these steps."
  		if (getActiveRange().startContainer.nodeType == Node.ELEMENT_NODE
  		&& !isAllowedChild("br", getActiveRange().startContainer)) {
  			return;
  		}
  
  		// "If the active range's start node is not an Element, and "br" is not
  		// an allowed child of the active range's start node's parent, abort
  		// these steps."
  		if (getActiveRange().startContainer.nodeType != Node.ELEMENT_NODE
  		&& !isAllowedChild("br", getActiveRange().startContainer.parentNode)) {
  			return;
  		}
  
  		// "If the active range's start node is a Text node and its start
  		// offset is zero, call collapse() on the context object's Selection,
  		// with first argument equal to the active range's start node's parent
  		// and second argument equal to the active range's start node's index."
  		if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
  		&& getActiveRange().startOffset == 0) {
  			var newNode = getActiveRange().startContainer.parentNode;
  			var newOffset = getNodeIndex(getActiveRange().startContainer);
  			getSelection().collapse(newNode, newOffset);
  			getActiveRange().setStart(newNode, newOffset);
  			getActiveRange().setEnd(newNode, newOffset);
  		}
  
  		// "If the active range's start node is a Text node and its start
  		// offset is the length of its start node, call collapse() on the
  		// context object's Selection, with first argument equal to the active
  		// range's start node's parent and second argument equal to one plus
  		// the active range's start node's index."
  		if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
  		&& getActiveRange().startOffset == getNodeLength(getActiveRange().startContainer)) {
  			var newNode = getActiveRange().startContainer.parentNode;
  			var newOffset = 1 + getNodeIndex(getActiveRange().startContainer);
  			getSelection().collapse(newNode, newOffset);
  			getActiveRange().setStart(newNode, newOffset);
  			getActiveRange().setEnd(newNode, newOffset);
  		}
  
  		// "Let br be the result of calling createElement("br") on the context
  		// object."
  		var br = document.createElement("br");
  
  		// "Call insertNode(br) on the active range."
  		getActiveRange().insertNode(br);
  
  		// "Call collapse() on the context object's Selection, with br's parent
  		// as the first argument and one plus br's index as the second
  		// argument."
  		getSelection().collapse(br.parentNode, 1 + getNodeIndex(br));
  		getActiveRange().setStart(br.parentNode, 1 + getNodeIndex(br));
  		getActiveRange().setEnd(br.parentNode, 1 + getNodeIndex(br));
  
  		// "If br is a collapsed line break, call createElement("br") on the
  		// context object and let extra br be the result, then call
  		// insertNode(extra br) on the active range."
  		if (isCollapsedLineBreak(br)) {
  			getActiveRange().insertNode(document.createElement("br"));
  
  			// Compensate for nonstandard implementations of insertNode
  			getSelection().collapse(br.parentNode, 1 + getNodeIndex(br));
  			getActiveRange().setStart(br.parentNode, 1 + getNodeIndex(br));
  			getActiveRange().setEnd(br.parentNode, 1 + getNodeIndex(br));
  		}
  	}
  };
  
  //@}
  ///// The insertOrderedList command /////
  //@{
  commands.insertorderedlist = {
  	// "Toggle lists with tag name "ol"."
  	action: function() { toggleLists("ol") },
  	// "True if the selection's list state is "mixed" or "mixed ol", false
  	// otherwise."
  	indeterm: function() { return /^mixed( ol)?$/.test(getSelectionListState()) },
  	// "True if the selection's list state is "ol", false otherwise."
  	state: function() { return getSelectionListState() == "ol" },
  };
  
  //@}
  ///// The insertParagraph command /////
  //@{
  commands.insertparagraph = {
  	action: function() {
  		// "Delete the selection."
  		deleteSelection();
  
  		// "If the active range's start node is neither editable nor an editing
  		// host, abort these steps."
  		if (!isEditable(getActiveRange().startContainer)
  		&& !isEditingHost(getActiveRange().startContainer)) {
  			return;
  		}
  
  		// "Let node and offset be the active range's start node and offset."
  		var node = getActiveRange().startContainer;
  		var offset = getActiveRange().startOffset;
  
  		// "If node is a Text node, and offset is neither 0 nor the length of
  		// node, call splitText(offset) on node."
  		if (node.nodeType == Node.TEXT_NODE
  		&& offset != 0
  		&& offset != getNodeLength(node)) {
  			node.splitText(offset);
  		}
  
  		// "If node is a Text node and offset is its length, set offset to one
  		// plus the index of node, then set node to its parent."
  		if (node.nodeType == Node.TEXT_NODE
  		&& offset == getNodeLength(node)) {
  			offset = 1 + getNodeIndex(node);
  			node = node.parentNode;
  		}
  
  		// "If node is a Text or Comment node, set offset to the index of node,
  		// then set node to its parent."
  		if (node.nodeType == Node.TEXT_NODE
  		|| node.nodeType == Node.COMMENT_NODE) {
  			offset = getNodeIndex(node);
  			node = node.parentNode;
  		}
  
  		// "Call collapse(node, offset) on the context object's Selection."
  		getSelection().collapse(node, offset);
  		getActiveRange().setStart(node, offset);
  		getActiveRange().setEnd(node, offset);
  
  		// "Let container equal node."
  		var container = node;
  
  		// "While container is not a single-line container, and container's
  		// parent is editable and in the same editing host as node, set
  		// container to its parent."
  		while (!isSingleLineContainer(container)
  		&& isEditable(container.parentNode)
  		&& inSameEditingHost(node, container.parentNode)) {
  			container = container.parentNode;
  		}
  
  		// "If container is an editable single-line container in the same
  		// editing host as node, and its local name is "p" or "div":"
  		if (isEditable(container)
  		&& isSingleLineContainer(container)
  		&& inSameEditingHost(node, container.parentNode)
  		&& (container.tagName == "P" || container.tagName == "DIV")) {
  			// "Let outer container equal container."
  			var outerContainer = container;
  
  			// "While outer container is not a dd or dt or li, and outer
  			// container's parent is editable, set outer container to its
  			// parent."
  			while (!isHtmlElement(outerContainer, ["dd", "dt", "li"])
  			&& isEditable(outerContainer.parentNode)) {
  				outerContainer = outerContainer.parentNode;
  			}
  
  			// "If outer container is a dd or dt or li, set container to outer
  			// container."
  			if (isHtmlElement(outerContainer, ["dd", "dt", "li"])) {
  				container = outerContainer;
  			}
  		}
  
  		// "If container is not editable or not in the same editing host as
  		// node or is not a single-line container:"
  		if (!isEditable(container)
  		|| !inSameEditingHost(container, node)
  		|| !isSingleLineContainer(container)) {
  			// "Let tag be the default single-line container name."
  			var tag = defaultSingleLineContainerName;
  
  			// "Block-extend the active range, and let new range be the
  			// result."
  			var newRange = blockExtend(getActiveRange());
  
  			// "Let node list be a list of nodes, initially empty."
  			//
  			// "Append to node list the first node in tree order that is
  			// contained in new range and is an allowed child of "p", if any."
  			var nodeList = getContainedNodes(newRange, function(node) { return isAllowedChild(node, "p") })
  				.slice(0, 1);
  
  			// "If node list is empty:"
  			if (!nodeList.length) {
  				// "If tag is not an allowed child of the active range's start
  				// node, abort these steps."
  				if (!isAllowedChild(tag, getActiveRange().startContainer)) {
  					return;
  				}
  
  				// "Set container to the result of calling createElement(tag)
  				// on the context object."
  				container = document.createElement(tag);
  
  				// "Call insertNode(container) on the active range."
  				getActiveRange().insertNode(container);
  
  				// "Call createElement("br") on the context object, and append
  				// the result as the last child of container."
  				container.appendChild(document.createElement("br"));
  
  				// "Call collapse(container, 0) on the context object's
  				// Selection."
  				getSelection().collapse(container, 0);
  				getActiveRange().setStart(container, 0);
  				getActiveRange().setEnd(container, 0);
  
  				// "Abort these steps."
  				return;
  			}
  
  			// "While the nextSibling of the last member of node list is not
  			// null and is an allowed child of "p", append it to node list."
  			while (nodeList[nodeList.length - 1].nextSibling
  			&& isAllowedChild(nodeList[nodeList.length - 1].nextSibling, "p")) {
  				nodeList.push(nodeList[nodeList.length - 1].nextSibling);
  			}
  
  			// "Wrap node list, with sibling criteria returning false and new
  			// parent instructions returning the result of calling
  			// createElement(tag) on the context object. Set container to the
  			// result."
  			container = wrap(nodeList,
  				function() { return false },
  				function() { return document.createElement(tag) }
  			);
  		}
  
  		// "If container's local name is "address", "listing", or "pre":"
  		if (container.tagName == "ADDRESS"
  		|| container.tagName == "LISTING"
  		|| container.tagName == "PRE") {
  			// "Let br be the result of calling createElement("br") on the
  			// context object."
  			var br = document.createElement("br");
  
  			// "Call insertNode(br) on the active range."
  			getActiveRange().insertNode(br);
  
  			// "Call collapse(node, offset + 1) on the context object's
  			// Selection."
  			getSelection().collapse(node, offset + 1);
  			getActiveRange().setStart(node, offset + 1);
  			getActiveRange().setEnd(node, offset + 1);
  
  			// "If br is the last descendant of container, let br be the result
  			// of calling createElement("br") on the context object, then call
  			// insertNode(br) on the active range."
  			//
  			// Work around browser bugs: some browsers select the
  			// newly-inserted node, not per spec.
  			if (!isDescendant(nextNode(br), container)) {
  				getActiveRange().insertNode(document.createElement("br"));
  				getSelection().collapse(node, offset + 1);
  				getActiveRange().setEnd(node, offset + 1);
  			}
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If container's local name is "li", "dt", or "dd"; and either it has
  		// no children or it has a single child and that child is a br:"
  		if (["LI", "DT", "DD"].indexOf(container.tagName) != -1
  		&& (!container.hasChildNodes()
  		|| (container.childNodes.length == 1
  		&& isHtmlElement(container.firstChild, "br")))) {
  			// "Split the parent of the one-node list consisting of container."
  			splitParent([container]);
  
  			// "If container has no children, call createElement("br") on the
  			// context object and append the result as the last child of
  			// container."
  			if (!container.hasChildNodes()) {
  				container.appendChild(document.createElement("br"));
  			}
  
  			// "If container is a dd or dt, and it is not an allowed child of
  			// any of its ancestors in the same editing host, set the tag name
  			// of container to the default single-line container name and let
  			// container be the result."
  			if (isHtmlElement(container, ["dd", "dt"])
  			&& getAncestors(container).every(function(ancestor) {
  				return !inSameEditingHost(container, ancestor)
  					|| !isAllowedChild(container, ancestor)
  			})) {
  				container = setTagName(container, defaultSingleLineContainerName);
  			}
  
  			// "Fix disallowed ancestors of container."
  			fixDisallowedAncestors(container);
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "Let new line range be a new range whose start is the same as
  		// the active range's, and whose end is (container, length of
  		// container)."
  		var newLineRange = document.createRange();
  		newLineRange.setStart(getActiveRange().startContainer, getActiveRange().startOffset);
  		newLineRange.setEnd(container, getNodeLength(container));
  
  		// "While new line range's start offset is zero and its start node is
  		// not a prohibited paragraph child, set its start to (parent of start
  		// node, index of start node)."
  		while (newLineRange.startOffset == 0
  		&& !isProhibitedParagraphChild(newLineRange.startContainer)) {
  			newLineRange.setStart(newLineRange.startContainer.parentNode, getNodeIndex(newLineRange.startContainer));
  		}
  
  		// "While new line range's start offset is the length of its start node
  		// and its start node is not a prohibited paragraph child, set its
  		// start to (parent of start node, 1 + index of start node)."
  		while (newLineRange.startOffset == getNodeLength(newLineRange.startContainer)
  		&& !isProhibitedParagraphChild(newLineRange.startContainer)) {
  			newLineRange.setStart(newLineRange.startContainer.parentNode, 1 + getNodeIndex(newLineRange.startContainer));
  		}
  
  		// "Let end of line be true if new line range contains either nothing
  		// or a single br, and false otherwise."
  		var containedInNewLineRange = getContainedNodes(newLineRange);
  		var endOfLine = !containedInNewLineRange.length
  			|| (containedInNewLineRange.length == 1
  			&& isHtmlElement(containedInNewLineRange[0], "br"));
  
  		// "If the local name of container is "h1", "h2", "h3", "h4", "h5", or
  		// "h6", and end of line is true, let new container name be the default
  		// single-line container name."
  		var newContainerName;
  		if (/^H[1-6]$/.test(container.tagName)
  		&& endOfLine) {
  			newContainerName = defaultSingleLineContainerName;
  
  		// "Otherwise, if the local name of container is "dt" and end of line
  		// is true, let new container name be "dd"."
  		} else if (container.tagName == "DT"
  		&& endOfLine) {
  			newContainerName = "dd";
  
  		// "Otherwise, if the local name of container is "dd" and end of line
  		// is true, let new container name be "dt"."
  		} else if (container.tagName == "DD"
  		&& endOfLine) {
  			newContainerName = "dt";
  
  		// "Otherwise, let new container name be the local name of container."
  		} else {
  			newContainerName = container.tagName.toLowerCase();
  		}
  
  		// "Let new container be the result of calling createElement(new
  		// container name) on the context object."
  		var newContainer = document.createElement(newContainerName);
  
  		// "Copy all attributes of container to new container."
  		for (var i = 0; i < container.attributes.length; i++) {
  			newContainer.setAttributeNS(container.attributes[i].namespaceURI, container.attributes[i].name, container.attributes[i].value);
  		}
  
  		// "If new container has an id attribute, unset it."
  		newContainer.removeAttribute("id");
  
  		// "Insert new container into the parent of container immediately after
  		// container."
  		container.parentNode.insertBefore(newContainer, container.nextSibling);
  
  		// "Let contained nodes be all nodes contained in new line range."
  		var containedNodes = getAllContainedNodes(newLineRange);
  
  		// "Let frag be the result of calling extractContents() on new line
  		// range."
  		var frag = newLineRange.extractContents();
  
  		// "Unset the id attribute (if any) of each Element descendant of frag
  		// that is not in contained nodes."
  		var descendants = getDescendants(frag);
  		for (var i = 0; i < descendants.length; i++) {
  			if (descendants[i].nodeType == Node.ELEMENT_NODE
  			&& containedNodes.indexOf(descendants[i]) == -1) {
  				descendants[i].removeAttribute("id");
  			}
  		}
  
  		// "Call appendChild(frag) on new container."
  		newContainer.appendChild(frag);
  
  		// "While container's lastChild is a prohibited paragraph child, set
  		// container to its lastChild."
  		while (isProhibitedParagraphChild(container.lastChild)) {
  			container = container.lastChild;
  		}
  
  		// "While new container's lastChild is a prohibited paragraph child,
  		// set new container to its lastChild."
  		while (isProhibitedParagraphChild(newContainer.lastChild)) {
  			newContainer = newContainer.lastChild;
  		}
  
  		// "If container has no visible children, call createElement("br") on
  		// the context object, and append the result as the last child of
  		// container."
  		if (![].some.call(container.childNodes, isVisible)) {
  			container.appendChild(document.createElement("br"));
  		}
  
  		// "If new container has no visible children, call createElement("br")
  		// on the context object, and append the result as the last child of
  		// new container."
  		if (![].some.call(newContainer.childNodes, isVisible)) {
  			newContainer.appendChild(document.createElement("br"));
  		}
  
  		// "Call collapse(new container, 0) on the context object's Selection."
  		getSelection().collapse(newContainer, 0);
  		getActiveRange().setStart(newContainer, 0);
  		getActiveRange().setEnd(newContainer, 0);
  	}
  };
  
  //@}
  ///// The insertText command /////
  //@{
  commands.inserttext = {
  	action: function(value) {
  		// "Delete the selection, with strip wrappers false."
  		deleteSelection({stripWrappers: false});
  
  		// "If the active range's start node is neither editable nor an editing
  		// host, abort these steps."
  		if (!isEditable(getActiveRange().startContainer)
  		&& !isEditingHost(getActiveRange().startContainer)) {
  			return;
  		}
  
  		// "If value's length is greater than one:"
  		if (value.length > 1) {
  			// "For each element el in value, take the action for the
  			// insertText command, with value equal to el."
  			for (var i = 0; i < value.length; i++) {
  				commands.inserttext.action(value[i]);
  			}
  
  			// "Abort these steps."
  			return;
  		}
  
  		// "If value is the empty string, abort these steps."
  		if (value == "") {
  			return;
  		}
  
  		// "If value is a newline (U+00A0), take the action for the
  		// insertParagraph command and abort these steps."
  		if (value == "\n") {
  			commands.insertparagraph.action();
  			return;
  		}
  
  		// "Let node and offset be the active range's start node and offset."
  		var node = getActiveRange().startContainer;
  		var offset = getActiveRange().startOffset;
  
  		// "If node has a child whose index is offset âˆ’ 1, and that child is a
  		// Text node, set node to that child, then set offset to node's
  		// length."
  		if (0 <= offset - 1
  		&& offset - 1 < node.childNodes.length
  		&& node.childNodes[offset - 1].nodeType == Node.TEXT_NODE) {
  			node = node.childNodes[offset - 1];
  			offset = getNodeLength(node);
  		}
  
  		// "If node has a child whose index is offset, and that child is a Text
  		// node, set node to that child, then set offset to zero."
  		if (0 <= offset
  		&& offset < node.childNodes.length
  		&& node.childNodes[offset].nodeType == Node.TEXT_NODE) {
  			node = node.childNodes[offset];
  			offset = 0;
  		}
  
  		// "Record current overrides, and let overrides be the result."
  		var overrides = recordCurrentOverrides();
  
  		// "Call collapse(node, offset) on the context object's Selection."
  		getSelection().collapse(node, offset);
  		getActiveRange().setStart(node, offset);
  		getActiveRange().setEnd(node, offset);
  
  		// "Canonicalize whitespace at (node, offset)."
  		canonicalizeWhitespace(node, offset);
  
  		// "Let (node, offset) be the active range's start."
  		node = getActiveRange().startContainer;
  		offset = getActiveRange().startOffset;
  
  		// "If node is a Text node:"
  		if (node.nodeType == Node.TEXT_NODE) {
  			// "Call insertData(offset, value) on node."
  			node.insertData(offset, value);
  
  			// "Call collapse(node, offset) on the context object's Selection."
  			getSelection().collapse(node, offset);
  			getActiveRange().setStart(node, offset);
  
  			// "Call extend(node, offset + 1) on the context object's
  			// Selection."
  			//
  			// Work around WebKit bug: the extend() can throw if the text we're
  			// adding is trailing whitespace.
  			try { getSelection().extend(node, offset + 1); } catch(e) {}
  			getActiveRange().setEnd(node, offset + 1);
  
  		// "Otherwise:"
  		} else {
  			// "If node has only one child, which is a collapsed line break,
  			// remove its child from it."
  			//
  			// FIXME: IE incorrectly returns false here instead of true
  			// sometimes?
  			if (node.childNodes.length == 1
  			&& isCollapsedLineBreak(node.firstChild)) {
  				node.removeChild(node.firstChild);
  			}
  
  			// "Let text be the result of calling createTextNode(value) on the
  			// context object."
  			var text = document.createTextNode(value);
  
  			// "Call insertNode(text) on the active range."
  			getActiveRange().insertNode(text);
  
  			// "Call collapse(text, 0) on the context object's Selection."
  			getSelection().collapse(text, 0);
  			getActiveRange().setStart(text, 0);
  
  			// "Call extend(text, 1) on the context object's Selection."
  			getSelection().extend(text, 1);
  			getActiveRange().setEnd(text, 1);
  		}
  
  		// "Restore states and values from overrides."
  		restoreStatesAndValues(overrides);
  
  		// "Canonicalize whitespace at the active range's start, with fix
  		// collapsed space false."
  		canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset, false);
  
  		// "Canonicalize whitespace at the active range's end, with fix
  		// collapsed space false."
  		canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset, false);
  
  		// "If value is a space character, autolink the active range's start."
  		if (/^[ \t\n\f\r]$/.test(value)) {
  			autolink(getActiveRange().startContainer, getActiveRange().startOffset);
  		}
  
  		// "Call collapseToEnd() on the context object's Selection."
  		//
  		// Work around WebKit bug: sometimes it blows up the selection and
  		// throws, which we don't want.
  		try { getSelection().collapseToEnd(); } catch(e) {}
  		getActiveRange().collapse(false);
  	}
  };
  
  //@}
  ///// The insertUnorderedList command /////
  //@{
  commands.insertunorderedlist = {
  	// "Toggle lists with tag name "ul"."
  	action: function() { toggleLists("ul") },
  	// "True if the selection's list state is "mixed" or "mixed ul", false
  	// otherwise."
  	indeterm: function() { return /^mixed( ul)?$/.test(getSelectionListState()) },
  	// "True if the selection's list state is "ul", false otherwise."
  	state: function() { return getSelectionListState() == "ul" },
  };
  
  //@}
  ///// The justifyCenter command /////
  //@{
  commands.justifycenter = {
  	// "Justify the selection with alignment "center"."
  	action: function() { justifySelection("center") },
  	indeterm: function() {
  		// "Return false if the active range is null.  Otherwise, block-extend
  		// the active range. Return true if among visible editable nodes that
  		// are contained in the result and have no children, at least one has
  		// alignment value "center" and at least one does not. Otherwise return
  		// false."
  		if (!getActiveRange()) {
  			return false;
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		return nodes.some(function(node) { return getAlignmentValue(node) == "center" })
  			&& nodes.some(function(node) { return getAlignmentValue(node) != "center" });
  	}, state: function() {
  		// "Return false if the active range is null.  Otherwise, block-extend
  		// the active range. Return true if there is at least one visible
  		// editable node that is contained in the result and has no children,
  		// and all such nodes have alignment value "center".  Otherwise return
  		// false."
  		if (!getActiveRange()) {
  			return false;
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		return nodes.length
  			&& nodes.every(function(node) { return getAlignmentValue(node) == "center" });
  	}, value: function() {
  		// "Return the empty string if the active range is null.  Otherwise,
  		// block-extend the active range, and return the alignment value of the
  		// first visible editable node that is contained in the result and has
  		// no children. If there is no such node, return "left"."
  		if (!getActiveRange()) {
  			return "";
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		if (nodes.length) {
  			return getAlignmentValue(nodes[0]);
  		} else {
  			return "left";
  		}
  	},
  };
  
  //@}
  ///// The justifyFull command /////
  //@{
  commands.justifyfull = {
  	// "Justify the selection with alignment "justify"."
  	action: function() { justifySelection("justify") },
  	indeterm: function() {
  		// "Return false if the active range is null.  Otherwise, block-extend
  		// the active range. Return true if among visible editable nodes that
  		// are contained in the result and have no children, at least one has
  		// alignment value "justify" and at least one does not. Otherwise
  		// return false."
  		if (!getActiveRange()) {
  			return false;
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		return nodes.some(function(node) { return getAlignmentValue(node) == "justify" })
  			&& nodes.some(function(node) { return getAlignmentValue(node) != "justify" });
  	}, state: function() {
  		// "Return false if the active range is null.  Otherwise, block-extend
  		// the active range. Return true if there is at least one visible
  		// editable node that is contained in the result and has no children,
  		// and all such nodes have alignment value "justify".  Otherwise return
  		// false."
  		if (!getActiveRange()) {
  			return false;
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		return nodes.length
  			&& nodes.every(function(node) { return getAlignmentValue(node) == "justify" });
  	}, value: function() {
  		// "Return the empty string if the active range is null.  Otherwise,
  		// block-extend the active range, and return the alignment value of the
  		// first visible editable node that is contained in the result and has
  		// no children. If there is no such node, return "left"."
  		if (!getActiveRange()) {
  			return "";
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		if (nodes.length) {
  			return getAlignmentValue(nodes[0]);
  		} else {
  			return "left";
  		}
  	},
  };
  
  //@}
  ///// The justifyLeft command /////
  //@{
  commands.justifyleft = {
  	// "Justify the selection with alignment "left"."
  	action: function() { justifySelection("left") },
  	indeterm: function() {
  		// "Return false if the active range is null.  Otherwise, block-extend
  		// the active range. Return true if among visible editable nodes that
  		// are contained in the result and have no children, at least one has
  		// alignment value "left" and at least one does not. Otherwise return
  		// false."
  		if (!getActiveRange()) {
  			return false;
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		return nodes.some(function(node) { return getAlignmentValue(node) == "left" })
  			&& nodes.some(function(node) { return getAlignmentValue(node) != "left" });
  	}, state: function() {
  		// "Return false if the active range is null.  Otherwise, block-extend
  		// the active range. Return true if there is at least one visible
  		// editable node that is contained in the result and has no children,
  		// and all such nodes have alignment value "left".  Otherwise return
  		// false."
  		if (!getActiveRange()) {
  			return false;
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		return nodes.length
  			&& nodes.every(function(node) { return getAlignmentValue(node) == "left" });
  	}, value: function() {
  		// "Return the empty string if the active range is null.  Otherwise,
  		// block-extend the active range, and return the alignment value of the
  		// first visible editable node that is contained in the result and has
  		// no children. If there is no such node, return "left"."
  		if (!getActiveRange()) {
  			return "";
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		if (nodes.length) {
  			return getAlignmentValue(nodes[0]);
  		} else {
  			return "left";
  		}
  	},
  };
  
  //@}
  ///// The justifyRight command /////
  //@{
  commands.justifyright = {
  	// "Justify the selection with alignment "right"."
  	action: function() { justifySelection("right") },
  	indeterm: function() {
  		// "Return false if the active range is null.  Otherwise, block-extend
  		// the active range. Return true if among visible editable nodes that
  		// are contained in the result and have no children, at least one has
  		// alignment value "right" and at least one does not. Otherwise return
  		// false."
  		if (!getActiveRange()) {
  			return false;
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		return nodes.some(function(node) { return getAlignmentValue(node) == "right" })
  			&& nodes.some(function(node) { return getAlignmentValue(node) != "right" });
  	}, state: function() {
  		// "Return false if the active range is null.  Otherwise, block-extend
  		// the active range. Return true if there is at least one visible
  		// editable node that is contained in the result and has no children,
  		// and all such nodes have alignment value "right".  Otherwise return
  		// false."
  		if (!getActiveRange()) {
  			return false;
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		return nodes.length
  			&& nodes.every(function(node) { return getAlignmentValue(node) == "right" });
  	}, value: function() {
  		// "Return the empty string if the active range is null.  Otherwise,
  		// block-extend the active range, and return the alignment value of the
  		// first visible editable node that is contained in the result and has
  		// no children. If there is no such node, return "left"."
  		if (!getActiveRange()) {
  			return "";
  		}
  		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
  			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
  		});
  		if (nodes.length) {
  			return getAlignmentValue(nodes[0]);
  		} else {
  			return "left";
  		}
  	},
  };
  
  //@}
  ///// The outdent command /////
  //@{
  commands.outdent = {
  	action: function() {
  		// "Record current overrides, and let overrides be the result."
  		var overrides = recordCurrentOverrides();
  
  		// "Let items be a list of all lis that are ancestor containers of the
  		// range's start and/or end node."
  		//
  		// It's annoying to get this in tree order using functional stuff
  		// without doing getDescendants(document), which is slow, so I do it
  		// imperatively.
  		var items = [];
  		(function(){
  			for (
  				var ancestorContainer = getActiveRange().endContainer;
  				ancestorContainer != getActiveRange().commonAncestorContainer;
  				ancestorContainer = ancestorContainer.parentNode
  			) {
  				if (isHtmlElement(ancestorContainer, "li")) {
  					items.unshift(ancestorContainer);
  				}
  			}
  			for (
  				var ancestorContainer = getActiveRange().startContainer;
  				ancestorContainer;
  				ancestorContainer = ancestorContainer.parentNode
  			) {
  				if (isHtmlElement(ancestorContainer, "li")) {
  					items.unshift(ancestorContainer);
  				}
  			}
  		})();
  
  		// "For each item in items, normalize sublists of item."
  		items.forEach(normalizeSublists);
  
  		// "Block-extend the active range, and let new range be the result."
  		var newRange = blockExtend(getActiveRange());
  
  		// "Let node list be a list of nodes, initially empty."
  		//
  		// "For each node node contained in new range, append node to node list
  		// if the last member of node list (if any) is not an ancestor of node;
  		// node is editable; and either node has no editable descendants, or is
  		// an ol or ul, or is an li whose parent is an ol or ul."
  		var nodeList = getContainedNodes(newRange, function(node) {
  			return isEditable(node)
  				&& (!getDescendants(node).some(isEditable)
  				|| isHtmlElement(node, ["ol", "ul"])
  				|| (isHtmlElement(node, "li") && isHtmlElement(node.parentNode, ["ol", "ul"])));
  		});
  
  		// "While node list is not empty:"
  		while (nodeList.length) {
  			// "While the first member of node list is an ol or ul or is not
  			// the child of an ol or ul, outdent it and remove it from node
  			// list."
  			while (nodeList.length
  			&& (isHtmlElement(nodeList[0], ["OL", "UL"])
  			|| !isHtmlElement(nodeList[0].parentNode, ["OL", "UL"]))) {
  				outdentNode(nodeList.shift());
  			}
  
  			// "If node list is empty, break from these substeps."
  			if (!nodeList.length) {
  				break;
  			}
  
  			// "Let sublist be a list of nodes, initially empty."
  			var sublist = [];
  
  			// "Remove the first member of node list and append it to sublist."
  			sublist.push(nodeList.shift());
  
  			// "While the first member of node list is the nextSibling of the
  			// last member of sublist, and the first member of node list is not
  			// an ol or ul, remove the first member of node list and append it
  			// to sublist."
  			while (nodeList.length
  			&& nodeList[0] == sublist[sublist.length - 1].nextSibling
  			&& !isHtmlElement(nodeList[0], ["OL", "UL"])) {
  				sublist.push(nodeList.shift());
  			}
  
  			// "Record the values of sublist, and let values be the result."
  			var values = recordValues(sublist);
  
  			// "Split the parent of sublist, with new parent null."
  			splitParent(sublist);
  
  			// "Fix disallowed ancestors of each member of sublist."
  			sublist.forEach(fixDisallowedAncestors);
  
  			// "Restore the values from values."
  			restoreValues(values);
  		}
  
  		// "Restore states and values from overrides."
  		restoreStatesAndValues(overrides);
  	}
  };
  
  //@}
  
  //////////////////////////////////
  ///// Miscellaneous commands /////
  //////////////////////////////////
  
  ///// The defaultParagraphSeparator command /////
  //@{
  commands.defaultparagraphseparator = {
  	action: function(value) {
  		// "Let value be converted to ASCII lowercase. If value is then equal
  		// to "p" or "div", set the context object's default single-line
  		// container name to value. Otherwise, do nothing."
  		value = value.toLowerCase();
  		if (value == "p" || value == "div") {
  			defaultSingleLineContainerName = value;
  		}
  	}, value: function() {
  		// "Return the context object's default single-line container name."
  		return defaultSingleLineContainerName;
  	},
  };
  
  //@}
  ///// The selectAll command /////
  //@{
  commands.selectall = {
  	// Note, this ignores the whole globalRange/getActiveRange() thing and
  	// works with actual selections.  Not suitable for autoimplementation.html.
  	action: function() {
  		// "Let target be the body element of the context object."
  		var target = document.body;
  
  		// "If target is null, let target be the context object's
  		// documentElement."
  		if (!target) {
  			target = document.documentElement;
  		}
  
  		// "If target is null, call getSelection() on the context object, and
  		// call removeAllRanges() on the result."
  		if (!target) {
  			getSelection().removeAllRanges();
  
  		// "Otherwise, call getSelection() on the context object, and call
  		// selectAllChildren(target) on the result."
  		} else {
  			getSelection().selectAllChildren(target);
  		}
  	}
  };
  
  //@}
  ///// The styleWithCSS command /////
  //@{
  commands.stylewithcss = {
  	action: function(value) {
  		// "If value is an ASCII case-insensitive match for the string
  		// "false", set the CSS styling flag to false. Otherwise, set the
  		// CSS styling flag to true."
  		cssStylingFlag = String(value).toLowerCase() != "false";
  	}, state: function() { return cssStylingFlag }
  };
  
  //@}
  ///// The useCSS command /////
  //@{
  commands.usecss = {
  	action: function(value) {
  		// "If value is an ASCII case-insensitive match for the string "false",
  		// set the CSS styling flag to true. Otherwise, set the CSS styling
  		// flag to false."
  		cssStylingFlag = String(value).toLowerCase() == "false";
  	}
  };
  //@}
  
  // Some final setup
  //@{
  (function() {
  // Opera 11.50 doesn't implement Object.keys, so I have to make an explicit
  // temporary, which means I need an extra closure to not leak the temporaries
  // into the global namespace.  >:(
  var commandNames = [];
  for (var command in commands) {
  	commandNames.push(command);
  }
  commandNames.forEach(function(command) {
  	// "If a command does not have a relevant CSS property specified, it
  	// defaults to null."
  	if (!("relevantCssProperty" in commands[command])) {
  		commands[command].relevantCssProperty = null;
  	}
  
  	// "If a command has inline command activated values defined but nothing
  	// else defines when it is indeterminate, it is indeterminate if among
  	// formattable nodes effectively contained in the active range, there is at
  	// least one whose effective command value is one of the given values and
  	// at least one whose effective command value is not one of the given
  	// values."
  	if ("inlineCommandActivatedValues" in commands[command]
  	&& !("indeterm" in commands[command])) {
  		commands[command].indeterm = function() {
  			if (!getActiveRange()) {
  				return false;
  			}
  
  			var values = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)
  				.map(function(node) { return getEffectiveCommandValue(node, command) });
  
  			var matchingValues = values.filter(function(value) {
  				return commands[command].inlineCommandActivatedValues.indexOf(value) != -1;
  			});
  
  			return matchingValues.length >= 1
  				&& values.length - matchingValues.length >= 1;
  		};
  	}
  
  	// "If a command has inline command activated values defined, its state is
  	// true if either no formattable node is effectively contained in the
  	// active range, and the active range's start node's effective command
  	// value is one of the given values; or if there is at least one
  	// formattable node effectively contained in the active range, and all of
  	// them have an effective command value equal to one of the given values."
  	if ("inlineCommandActivatedValues" in commands[command]) {
  		commands[command].state = function() {
  			if (!getActiveRange()) {
  				return false;
  			}
  
  			var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);
  
  			if (nodes.length == 0) {
  				return commands[command].inlineCommandActivatedValues
  					.indexOf(getEffectiveCommandValue(getActiveRange().startContainer, command)) != -1;
  			} else {
  				return nodes.every(function(node) {
  					return commands[command].inlineCommandActivatedValues
  						.indexOf(getEffectiveCommandValue(node, command)) != -1;
  				});
  			}
  		};
  	}
  
  	// "If a command is a standard inline value command, it is indeterminate if
  	// among formattable nodes that are effectively contained in the active
  	// range, there are two that have distinct effective command values. Its
  	// value is the effective command value of the first formattable node that
  	// is effectively contained in the active range; or if there is no such
  	// node, the effective command value of the active range's start node; or
  	// if that is null, the empty string."
  	if ("standardInlineValueCommand" in commands[command]) {
  		commands[command].indeterm = function() {
  			if (!getActiveRange()) {
  				return false;
  			}
  
  			var values = getAllEffectivelyContainedNodes(getActiveRange())
  				.filter(isFormattableNode)
  				.map(function(node) { return getEffectiveCommandValue(node, command) });
  			for (var i = 1; i < values.length; i++) {
  				if (values[i] != values[i - 1]) {
  					return true;
  				}
  			}
  			return false;
  		};
  
  		commands[command].value = function() {
  			if (!getActiveRange()) {
  				return "";
  			}
  
  			var refNode = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)[0];
  
  			if (typeof refNode == "undefined") {
  				refNode = getActiveRange().startContainer;
  			}
  
  			var ret = getEffectiveCommandValue(refNode, command);
  			if (ret === null) {
  				return "";
  			}
  			return ret;
  		};
  	}
  });
  })();
  //@}
  
  // vim: foldmarker=@{,@} foldmethod=marker