text: /**
   * @requires javelin-magical-init
   *           javelin-install
   *           javelin-util
   *           javelin-vector
   *           javelin-stratcom
   * @provides javelin-dom
   *
   * @javelin-installs JX.$
   * @javelin-installs JX.$N
   * @javelin-installs JX.$H
   *
   * @javelin
   */
  
  
  /**
   * Select an element by its "id" attribute, like ##document.getElementById()##.
   * For example:
   *
   *   var node = JX.$('some_id');
   *
   * This will select the node with the specified "id" attribute:
   *
   *   LANG=HTML
   *   <div id="some_id">...</div>
   *
   * If the specified node does not exist, @{JX.$()} will throw an exception.
   *
   * For other ways to select nodes from the document, see @{JX.DOM.scry()} and
   * @{JX.DOM.find()}.
   *
   * @param  string  "id" attribute to select from the document.
   * @return Node    Node with the specified "id" attribute.
   *
   * @group dom
   */
  JX.$ = function(id) {
  
    if (__DEV__) {
      if (!id) {
        JX.$E('Empty ID passed to JX.$()!');
      }
    }
  
    var node = document.getElementById(id);
    if (!node || (node.id != id)) {
      if (__DEV__) {
        if (node && (node.id != id)) {
          JX.$E(
            'JX.$("'+id+'"): '+
            'document.getElementById() returned an element without the '+
            'correct ID. This usually means that the element you are trying '+
            'to select is being masked by a form with the same value in its '+
            '"name" attribute.');
        }
      }
      JX.$E("JX.$('" + id + "') call matched no nodes.");
    }
  
    return node;
  };
  
  /**
   * Upcast a string into an HTML object so it is treated as markup instead of
   * plain text. See @{JX.$N} for discussion of Javelin's security model. Every
   * time you call this function you potentially open up a security hole. Avoid
   * its use wherever possible.
   *
   * This class intentionally supports only a subset of HTML because many browsers
   * named "Internet Explorer" have awkward restrictions around what they'll
   * accept for conversion to document fragments. Alter your datasource to emit
   * valid HTML within this subset if you run into an unsupported edge case. All
   * the edge cases are crazy and you should always be reasonably able to emit
   * a cohesive tag instead of an unappendable fragment.
   *
   * You may use @{JX.$H} as a shortcut for creating new JX.HTML instances:
   *
   *   JX.$N('div', {}, some_html_blob); // Treat as string (safe)
   *   JX.$N('div', {}, JX.$H(some_html_blob)); // Treat as HTML (unsafe!)
   *
   * @task build String into HTML
   * @task nodes HTML into Nodes
   *
   * @group dom
   */
  JX.install('HTML', {
  
    construct : function(str) {
      if (str instanceof JX.HTML) {
        this._content = str._content;
        return;
      }
  
      if (__DEV__) {
        if ((typeof str !== 'string') && (!str || !str.match)) {
          JX.$E(
            'new JX.HTML(<empty?>): ' +
            'call initializes an HTML object with an empty value.');
        }
  
        var tags = ['legend', 'thead', 'tbody', 'tfoot', 'column', 'colgroup',
                    'caption', 'tr', 'th', 'td', 'option'];
        var evil_stuff = new RegExp('^\\s*<(' + tags.join('|') + ')\\b', 'i');
        var match = str.match(evil_stuff);
        if (match) {
          JX.$E(
            'new JX.HTML("<' + match[1] + '>..."): ' +
            'call initializes an HTML object with an invalid partial fragment ' +
            'and can not be converted into DOM nodes. The enclosing tag of an ' +
            'HTML content string must be appendable to a document fragment. ' +
            'For example, <table> is allowed but <tr> or <tfoot> are not.');
        }
  
        var really_evil = /<script\b/;
        if (str.match(really_evil)) {
          JX.$E(
            'new JX.HTML("...<script>..."): ' +
            'call initializes an HTML object with an embedded script tag! ' +
            'Are you crazy?! Do NOT do this!!!');
        }
  
        var wont_work = /<object\b/;
        if (str.match(wont_work)) {
          JX.$E(
            'new JX.HTML("...<object>..."): ' +
            'call initializes an HTML object with an embedded <object> tag. IE ' +
            'will not do the right thing with this.');
        }
  
        // TODO(epriestley): May need to deny <option> more broadly, see
        // http://support.microsoft.com/kb/829907 and the whole mess in the
        // heavy stack. But I seem to have gotten away without cloning into the
        // documentFragment below, so this may be a nonissue.
      }
  
      this._content = str;
    },
  
    members : {
      _content : null,
      /**
       * Convert the raw HTML string into a DOM node tree.
       *
       * @task  nodes
       * @return DocumentFragment A document fragment which contains the nodes
       *                          corresponding to the HTML string you provided.
       */
      getFragment : function() {
        var wrapper = JX.$N('div');
        wrapper.innerHTML = this._content;
        var fragment = document.createDocumentFragment();
        while (wrapper.firstChild) {
          // TODO(epriestley): Do we need to do a bunch of cloning junk here?
          // See heavy stack. I'm disconnecting the nodes instead; this seems
          // to work but maybe my test case just isn't extensive enough.
          fragment.appendChild(wrapper.removeChild(wrapper.firstChild));
        }
        return fragment;
      },
  
      /**
       * Convert the raw HTML string into a single DOM node. This only works
       * if the element has a single top-level element. Otherwise, use
       * @{method:getFragment} to get a document fragment instead.
       *
       * @return Node Single node represented by the object.
       * @task nodes
       */
      getNode : function() {
        var fragment = this.getFragment();
        if (__DEV__) {
          if (fragment.childNodes.length < 1) {
            JX.$E('JX.HTML.getNode(): Markup has no root node!');
          }
          if (fragment.childNodes.length > 1) {
            JX.$E('JX.HTML.getNode(): Markup has more than one root node!');
          }
        }
        return fragment.firstChild;
      }
  
    }
  });
  
  
  /**
   * Build a new HTML object from a trustworthy string. JX.$H is a shortcut for
   * creating new JX.HTML instances.
   *
   * @task build
   * @param string A string which you want to be treated as HTML, because you
   *               know it is from a trusted source and any data in it has been
   *               properly escaped.
   * @return JX.HTML HTML object, suitable for use with @{JX.$N}.
   *
   * @group dom
   */
  JX.$H = function(str) {
    return new JX.HTML(str);
  };
  
  
  /**
   * Create a new DOM node with attributes and content.
   *
   *   var link = JX.$N('a');
   *
   * This creates a new, empty anchor tag without any attributes. The equivalent
   * markup would be:
   *
   *   LANG=HTML
   *   <a />
   *
   * You can also specify attributes by passing a dictionary:
   *
   *   JX.$N('a', {name: 'anchor'});
   *
   * This is equivalent to:
   *
   *   LANG=HTML
   *   <a name="anchor" />
   *
   * Additionally, you can specify content:
   *
   *   JX.$N(
   *     'a',
   *     {href: 'http://www.javelinjs.com'},
   *     'Visit the Javelin Homepage');
   *
   * This is equivalent to:
   *
   *   LANG=HTML
   *   <a href="http://www.javelinjs.com">Visit the Javelin Homepage</a>
   *
   * If you only want to specify content, you can omit the attribute parameter.
   * That is, these calls are equivalent:
   *
   *   JX.$N('div', {}, 'Lorem ipsum...'); // No attributes.
   *   JX.$N('div', 'Lorem ipsum...')      // Same as above.
   *
   * Both are equivalent to:
   *
   *   LANG=HTML
   *   <div>Lorem ipsum...</div>
   *
   * Note that the content is treated as plain text, not HTML. This means it is
   * safe to use untrusted strings:
   *
   *   JX.$N('div', '<script src="evil.com" />');
   *
   * This is equivalent to:
   *
   *   LANG=HTML
   *   <div>&lt;script src="evil.com" /&gt;</div>
   *
   * That is, the content will be properly escaped and will not create a
   * vulnerability. If you want to set HTML content, you can use @{JX.HTML}:
   *
   *   JX.$N('div', JX.$H(some_html));
   *
   * **This is potentially unsafe**, so make sure you understand what you're
   * doing. You should usually avoid passing HTML around in string form. See
   * @{JX.HTML} for discussion.
   *
   * You can create new nodes with a Javelin sigil (and, optionally, metadata) by
   * providing "sigil" and "meta" keys in the attribute dictionary.
   *
   * @param string                  Tag name, like 'a' or 'div'.
   * @param dict|string|@{JX.HTML}? Property dictionary, or content if you don't
   *                                want to specify any properties.
   * @param string|@{JX.HTML}?      Content string (interpreted as plain text)
   *                                or @{JX.HTML} object (interpreted as HTML,
   *                                which may be dangerous).
   * @return Node                   New node with whatever attributes and
   *                                content were specified.
   *
   * @group dom
   */
  JX.$N = function(tag, attr, content) {
    if (typeof content == 'undefined' &&
        (typeof attr != 'object' || attr instanceof JX.HTML)) {
      content = attr;
      attr = {};
    }
  
    if (__DEV__) {
      if (tag.toLowerCase() != tag) {
        JX.$E(
          '$N("'+tag+'", ...): '+
          'tag name must be in lower case; '+
          'use "'+tag.toLowerCase()+'", not "'+tag+'".');
      }
    }
  
    var node = document.createElement(tag);
  
    if (attr.style) {
      JX.copy(node.style, attr.style);
      delete attr.style;
    }
  
    if (attr.sigil) {
      JX.Stratcom.addSigil(node, attr.sigil);
      delete attr.sigil;
    }
  
    if (attr.meta) {
      JX.Stratcom.addData(node, attr.meta);
      delete attr.meta;
    }
  
    if (__DEV__) {
      if (('metadata' in attr) || ('data' in attr)) {
        JX.$E(
          '$N(' + tag + ', ...): ' +
          'use the key "meta" to specify metadata, not "data" or "metadata".');
      }
    }
  
    JX.copy(node, attr);
    if (content) {
      JX.DOM.setContent(node, content);
    }
    return node;
  };
  
  
  /**
   * Query and update the DOM. Everything here is static, this is essentially
   * a collection of common utility functions.
   *
   * @task stratcom Attaching Event Listeners
   * @task content Changing DOM Content
   * @task nodes Updating Nodes
   * @task serialize Serializing Forms
   * @task test Testing DOM Properties
   * @task convenience Convenience Methods
   * @task query Finding Nodes in the DOM
   * @task view Changing View State
   *
   * @group dom
   */
  JX.install('DOM', {
    statics : {
      _autoid : 0,
      _uniqid : 0,
      _metrics : {},
  
  
  /* -(  Changing DOM Content  )----------------------------------------------- */
  
  
      /**
       * Set the content of some node. This uses the same content semantics as
       * other Javelin content methods, see @{function:JX.$N} for a detailed
       * explanation. Previous content will be replaced: you can also
       * @{method:prependContent} or @{method:appendContent}.
       *
       * @param Node  Node to set content of.
       * @param mixed Content to set.
       * @return void
       * @task content
       */
      setContent : function(node, content) {
        if (__DEV__) {
          if (!JX.DOM.isNode(node)) {
            JX.$E(
              'JX.DOM.setContent(<yuck>, ...): '+
              'first argument must be a DOM node.');
          }
        }
  
        while (node.firstChild) {
          JX.DOM.remove(node.firstChild);
        }
        JX.DOM.appendContent(node, content);
      },
  
  
      /**
       * Prepend content to some node. This method uses the same content semantics
       * as other Javelin methods, see @{function:JX.$N} for an explanation. You
       * can also @{method:setContent} or @{method:appendContent}.
       *
       * @param Node  Node to prepend content to.
       * @param mixed Content to prepend.
       * @return void
       * @task content
       */
      prependContent : function(node, content) {
        if (__DEV__) {
          if (!JX.DOM.isNode(node)) {
            JX.$E(
              'JX.DOM.prependContent(<junk>, ...): '+
              'first argument must be a DOM node.');
          }
        }
  
        this._insertContent(node, content, this._mechanismPrepend, true);
      },
  
  
      /**
       * Append content to some node. This method uses the same content semantics
       * as other Javelin methods, see @{function:JX.$N} for an explanation. You
       * can also @{method:setContent} or @{method:prependContent}.
       *
       * @param Node Node to append the content of.
       * @param mixed Content to append.
       * @return void
       * @task content
       */
      appendContent : function(node, content) {
        if (__DEV__) {
          if (!JX.DOM.isNode(node)) {
            JX.$E(
              'JX.DOM.appendContent(<bleh>, ...): '+
              'first argument must be a DOM node.');
          }
        }
  
        this._insertContent(node, content, this._mechanismAppend);
      },
  
  
      /**
       * Internal, add content to a node by prepending.
       *
       * @param Node  Node to prepend content to.
       * @param Node  Node to prepend.
       * @return void
       * @task content
       */
      _mechanismPrepend : function(node, content) {
        node.insertBefore(content, node.firstChild);
      },
  
  
      /**
       * Internal, add content to a node by appending.
       *
       * @param Node  Node to append content to.
       * @param Node  Node to append.
       * @task content
       */
      _mechanismAppend : function(node, content) {
        node.appendChild(content);
      },
  
  
      /**
       * Internal, add content to a node using some specified mechanism.
       *
       * @param Node      Node to add content to.
       * @param mixed     Content to add.
       * @param function  Callback for actually adding the nodes.
       * @param bool      True if array elements should be passed to the mechanism
       *                  in reverse order, i.e. the mechanism prepends nodes.
       * @return void
       * @task content
       */
      _insertContent : function(parent, content, mechanism, reverse) {
        if (JX.isArray(content)) {
          if (reverse) {
            content = [].concat(content).reverse();
          }
          for (var ii = 0; ii < content.length; ii++) {
            JX.DOM._insertContent(parent, content[ii], mechanism, reverse);
          }
        } else {
          var type = typeof content;
          if (content instanceof JX.HTML) {
            content = content.getFragment();
          } else if (type == 'string' || type == 'number') {
            content = document.createTextNode(content);
          }
  
          if (__DEV__) {
            if (content && !content.nodeType) {
              JX.$E(
                'JX.DOM._insertContent(<node>, ...): '+
                'second argument must be a string, a number, ' +
                'a DOM node or a JX.HTML instance');
            }
          }
  
          content && mechanism(parent, content);
        }
      },
  
  
  /* -(  Updating Nodes  )----------------------------------------------------- */
  
  
      /**
       * Remove a node from its parent, so it is no longer a child of any other
       * node.
       *
       * @param Node Node to remove.
       * @return Node The node.
       * @task nodes
       */
      remove : function(node) {
        node.parentNode && JX.DOM.replace(node, null);
        return node;
      },
  
  
      /**
       * Replace a node with some other piece of content. This method obeys
       * Javelin content semantics, see @{function:JX.$N} for an explanation.
       * You can also @{method:setContent}, @{method:prependContent}, or
       * @{method:appendContent}.
       *
       * @param Node Node to replace.
       * @param mixed Content to replace it with.
       * @return Node the original node.
       * @task nodes
       */
      replace : function(node, replacement) {
        if (__DEV__) {
          if (!node.parentNode) {
            JX.$E(
              'JX.DOM.replace(<node>, ...): '+
              'node has no parent node, so it can not be replaced.');
          }
        }
  
        var mechanism;
        if (node.nextSibling) {
          mechanism = JX.bind(node.nextSibling, function(parent, content) {
            parent.insertBefore(content, this);
          });
        } else {
          mechanism = this._mechanismAppend;
        }
        var parent = node.parentNode;
        parent.removeChild(node);
        this._insertContent(parent, replacement, mechanism);
  
        return node;
      },
  
  
  /* -(  Serializing Froms  )-------------------------------------------------- */
  
  
      /**
       * Converts a form into a list of <name, value> pairs.
       *
       * Note: This function explicity does not match for submit inputs as there
       * could be multiple in a form. It's the caller's obligation to add the
       * submit input value if desired.
       *
       * @param   Node  The form element to convert into a list of pairs.
       * @return  List  A list of <name, value> pairs.
       * @task serialize
       */
      convertFormToListOfPairs : function(form) {
        var elements = form.getElementsByTagName('*');
        var data = [];
        for (var ii = 0; ii < elements.length; ++ii) {
          if (!elements[ii].name) {
            continue;
          }
          if (elements[ii].disabled) {
            continue;
          }
          var type = elements[ii].type;
          var tag  = elements[ii].tagName;
          if ((type in {radio: 1, checkbox: 1} && elements[ii].checked) ||
               type in {text: 1, hidden: 1, password: 1, email: 1, tel: 1,
                        number: 1} ||
               tag in {TEXTAREA: 1, SELECT: 1}) {
            data.push([elements[ii].name, elements[ii].value]);
          }
        }
        return data;
      },
  
  
      /**
       * Converts a form into a dictionary mapping input names to values. This
       * will overwrite duplicate inputs in an undefined way.
       *
       * @param   Node  The form element to convert into a dictionary.
       * @return  Dict  A dictionary of form values.
       * @task serialize
       */
      convertFormToDictionary : function(form) {
        var data = {};
        var pairs = JX.DOM.convertFormToListOfPairs(form);
        for (var ii = 0; ii < pairs.length; ii++) {
          data[pairs[ii][0]] = pairs[ii][1];
        }
        return data;
      },
  
  
  /* -(  Testing DOM Properties  )--------------------------------------------- */
  
  
      /**
       * Test if an object is a valid Node.
       *
       * @param wild Something which might be a Node.
       * @return bool True if the parameter is a DOM node.
       * @task test
       */
      isNode : function(node) {
        return !!(node && node.nodeName && (node !== window));
      },
  
  
      /**
       * Test if an object is a node of some specific (or one of several) types.
       * For example, this tests if the node is an ##<input />##, ##<select />##,
       * or ##<textarea />##.
       *
       *   JX.DOM.isType(node, ['input', 'select', 'textarea']);
       *
       * @param   wild        Something which might be a Node.
       * @param   string|list One or more tags which you want to test for.
       * @return  bool        True if the object is a node, and it's a node of one
       *                      of the provided types.
       * @task    test
       */
      isType : function(node, of_type) {
        node = ('' + (node.nodeName || '')).toUpperCase();
        of_type = JX.$AX(of_type);
        for (var ii = 0; ii < of_type.length; ++ii) {
          if (of_type[ii].toUpperCase() == node) {
            return true;
          }
        }
        return false;
      },
  
  
      /**
       * Listen for events occuring beneath a specific node in the DOM. This is
       * similar to @{JX.Stratcom.listen()}, but allows you to specify some node
       * which serves as a scope instead of the default scope (the whole document)
       * which you get if you install using @{JX.Stratcom.listen()} directly. For
       * example, to listen for clicks on nodes with the sigil 'menu-item' below
       * the root menu node:
       *
       *   var the_menu = getReferenceToTheMenuNodeSomehow();
       *   JX.DOM.listen(the_menu, 'click', 'menu-item', function(e) { ... });
       *
       * @task stratcom
       * @param Node        The node to listen for events underneath.
       * @param string|list One or more event types to listen for.
       * @param list?       A path to listen on, or a list of paths.
       * @param function    Callback to invoke when a matching event occurs.
       * @return object     A reference to the installed listener. You can later
       *                    remove the listener by calling this object's remove()
       *                    method.
       */
      listen : function(node, type, path, callback) {
        var auto_id = ['autoid:' + JX.DOM._getAutoID(node)];
        path = JX.$AX(path || []);
        if (!path.length) {
          path = auto_id;
        } else {
          for (var ii = 0; ii < path.length; ii++) {
            path[ii] = auto_id.concat(JX.$AX(path[ii]));
          }
        }
        return JX.Stratcom.listen(type, path, callback);
      },
  
  
      /**
       * Invoke a custom event on a node. This method is a companion to
       * @{method:JX.DOM.listen} and parallels @{method:JX.Stratcom.invoke} in
       * the same way that method parallels @{method:JX.Stratcom.listen}.
       *
       * This method can not be used to invoke native events (like 'click').
       *
       * @param Node      The node to invoke an event on.
       * @param string    Custom event type.
       * @param dict      Event data.
       * @return JX.Event The event object which was dispatched to listeners.
       *                  The main use of this is to test whether any
       *                  listeners prevented the event.
       */
      invoke : function(node, type, data) {
        if (__DEV__) {
          if (type in JX.__allowedEvents) {
            throw new Error(
              'JX.DOM.invoke(..., "' + type + '", ...): ' +
              'you cannot invoke with the same type as a native event.');
          }
        }
        return JX.Stratcom.dispatch({
          target: node,
          type: type,
          customData: data
        });
      },
  
  
      uniqID : function(node) {
        if (!node.getAttribute('id')) {
          node.setAttribute('id', 'uniqid_'+(++JX.DOM._uniqid));
        }
        return node.getAttribute('id');
      },
  
      alterClass : function(node, className, add) {
        if (__DEV__) {
          if (add !== false && add !== true) {
            JX.$E(
              'JX.DOM.alterClass(...): ' +
              'expects the third parameter to be Boolean: ' +
              add + ' was provided');
          }
        }
  
        var has = ((' '+node.className+' ').indexOf(' '+className+' ') > -1);
        if (add && !has) {
          node.className += ' '+className;
        } else if (has && !add) {
          node.className = node.className.replace(
            new RegExp('(^|\\s)' + className + '(?:\\s|$)', 'g'), ' ');
        }
      },
  
      htmlize : function(str) {
        return (''+str)
          .replace(/&/g, '&amp;')
          .replace(/"/g, '&quot;')
          .replace(/</g, '&lt;')
          .replace(/>/g, '&gt;');
      },
  
  
      /**
       * Show one or more elements, by removing their "display" style. This
       * assumes you have hidden them with @{method:hide}, or explicitly set
       * the style to `display: none;`.
       *
       * @task convenience
       * @param ... One or more nodes to remove "display" styles from.
       * @return void
       */
      show : function() {
        var ii;
  
        if (__DEV__) {
          for (ii = 0; ii < arguments.length; ++ii) {
            if (!arguments[ii]) {
              JX.$E(
                'JX.DOM.show(...): ' +
                'one or more arguments were null or empty.');
            }
          }
        }
  
        for (ii = 0; ii < arguments.length; ++ii) {
          arguments[ii].style.display = '';
        }
      },
  
  
      /**
       * Hide one or more elements, by setting `display: none;` on them. This is
       * a convenience method. See also @{method:show}.
       *
       * @task convenience
       * @param ... One or more nodes to set "display: none" on.
       * @return void
       */
      hide : function() {
        var ii;
  
        if (__DEV__) {
          for (ii = 0; ii < arguments.length; ++ii) {
            if (!arguments[ii]) {
              JX.$E(
                'JX.DOM.hide(...): ' +
                'one or more arguments were null or empty.');
            }
          }
        }
  
        for (ii = 0; ii < arguments.length; ++ii) {
          arguments[ii].style.display = 'none';
        }
      },
  
      textMetrics : function(node, pseudoclass, x) {
        if (!this._metrics[pseudoclass]) {
          var n = JX.$N(
            'var',
            {className: pseudoclass});
          this._metrics[pseudoclass] = n;
        }
        var proxy = this._metrics[pseudoclass];
        document.body.appendChild(proxy);
        proxy.style.width = x ? (x+'px') : '';
        JX.DOM.setContent(
          proxy,
          JX.$H(JX.DOM.htmlize(node.value).replace(/\n/g, '<br />')));
        var metrics = JX.Vector.getDim(proxy);
        document.body.removeChild(proxy);
        return metrics;
      },
  
  
      /**
       * Search the document for DOM nodes by providing a root node to look
       * beneath, a tag name, and (optionally) a sigil. Nodes which match all
       * specified conditions are returned.
       *
       * @task query
       *
       * @param  Node    Root node to search beneath.
       * @param  string  Tag name, like 'a' or 'textarea'.
       * @param  string  Optionally, a sigil which nodes are required to have.
       *
       * @return list    List of matching nodes, which may be empty.
       */
      scry : function(root, tagname, sigil) {
        if (__DEV__) {
          if (!JX.DOM.isNode(root)) {
            JX.$E(
              'JX.DOM.scry(<yuck>, ...): '+
              'first argument must be a DOM node.');
          }
        }
  
        var nodes = root.getElementsByTagName(tagname);
        if (!sigil) {
          return JX.$A(nodes);
        }
        var result = [];
        for (var ii = 0; ii < nodes.length; ii++) {
          if (JX.Stratcom.hasSigil(nodes[ii], sigil)) {
            result.push(nodes[ii]);
          }
        }
        return result;
      },
  
  
      /**
       * Select a node uniquely identified by a root, tagname and sigil. This
       * is similar to JX.DOM.scry() but expects exactly one result.
       *
       * @task query
       *
       * @param  Node    Root node to search beneath.
       * @param  string  Tag name, like 'a' or 'textarea'.
       * @param  string  Optionally, sigil which selected node must have.
       *
       * @return Node    Node uniquely identified by the criteria.
       */
      find : function(root, tagname, sigil) {
        if (__DEV__) {
          if (!JX.DOM.isNode(root)) {
            JX.$E(
              'JX.DOM.find(<glop>, "'+tagname+'", "'+sigil+'"): '+
              'first argument must be a DOM node.');
          }
        }
  
        var result = JX.DOM.scry(root, tagname, sigil);
  
        if (__DEV__) {
          if (result.length > 1) {
            JX.$E(
              'JX.DOM.find(<node>, "'+tagname+'", "'+sigil+'"): '+
              'matched more than one node.');
          }
        }
  
        if (!result.length) {
          JX.$E(
            'JX.DOM.find(<node>, "' + tagname + '", "' + sigil + '"): ' +
            'matched no nodes.');
        }
  
        return result[0];
      },
  
  
      /**
       * Select a node uniquely identified by an anchor, tagname, and sigil. This
       * is similar to JX.DOM.find() but walks up the DOM tree instead of down
       * it.
       *
       * @param   Node    Node to look above.
       * @param   string  Tag name, like 'a' or 'textarea'.
       * @param   string  Optionally, sigil which selected node must have.
       * @return  Node    Matching node.
       *
       * @task    query
       */
      findAbove : function(anchor, tagname, sigil) {
        if (__DEV__) {
          if (!JX.DOM.isNode(anchor)) {
            JX.$E(
              'JX.DOM.findAbove(<glop>, "' + tagname + '", "' + sigil + '"): ' +
              'first argument must be a DOM node.');
          }
        }
  
        var result = anchor.parentNode;
        while (true) {
          if (!result) {
            break;
          }
          if (JX.DOM.isType(result, tagname)) {
            if (!sigil || JX.Stratcom.hasSigil(result, sigil)) {
              break;
            }
          }
          result = result.parentNode;
        }
  
        if (!result) {
          JX.$E(
            'JX.DOM.findAbove(<node>, "' + tagname + '", "' + sigil + '"): ' +
            'no matching node.');
        }
  
        return result;
      },
  
  
      /**
       * Focus a node safely. This is just a convenience wrapper that allows you
       * to avoid IE's habit of throwing when nearly any focus operation is
       * invoked.
       *
       * @task convenience
       * @param Node Node to move cursor focus to, if possible.
       * @return void
       */
      focus : function(node) {
        try { node.focus(); } catch (lol_ie) {}
      },
  
      /**
       * Scroll to the position of an element in the document.
       * @task view
       * @param Node Node to move document scroll position to, if possible.
       * @return void
       */
      scrollTo : function(node) {
        window.scrollTo(0, JX.$V(node).y);
      },
  
      _getAutoID : function(node) {
        if (!node.getAttribute('data-autoid')) {
          node.setAttribute('data-autoid', 'autoid_'+(++JX.DOM._autoid));
        }
        return node.getAttribute('data-autoid');
      }
    }
  });
  
  