text: // Copyright 2006 The Closure Library Authors. All Rights Reserved.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS-IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /**
   * @fileoverview Utilities for element styles.
   *
   * @author arv@google.com (Erik Arvidsson)
   * @author eae@google.com (Emil A Eklund)
   * @see ../demos/inline_block_quirks.html
   * @see ../demos/inline_block_standards.html
   * @see ../demos/style_viewport.html
   */
  
  goog.provide('goog.style');
  
  
  goog.require('goog.array');
  goog.require('goog.asserts');
  goog.require('goog.dom');
  goog.require('goog.dom.NodeType');
  goog.require('goog.dom.TagName');
  goog.require('goog.dom.vendor');
  goog.require('goog.html.SafeStyleSheet');
  goog.require('goog.math.Box');
  goog.require('goog.math.Coordinate');
  goog.require('goog.math.Rect');
  goog.require('goog.math.Size');
  goog.require('goog.object');
  goog.require('goog.reflect');
  goog.require('goog.string');
  goog.require('goog.userAgent');
  
  goog.forwardDeclare('goog.events.Event');
  
  
  /**
   * Sets a style value on an element.
   *
   * This function is not indended to patch issues in the browser's style
   * handling, but to allow easy programmatic access to setting dash-separated
   * style properties.  An example is setting a batch of properties from a data
   * object without overwriting old styles.  When possible, use native APIs:
   * elem.style.propertyKey = 'value' or (if obliterating old styles is fine)
   * elem.style.cssText = 'property1: value1; property2: value2'.
   *
   * @param {Element} element The element to change.
   * @param {string|Object} style If a string, a style name. If an object, a hash
   *     of style names to style values.
   * @param {string|number|boolean=} opt_value If style was a string, then this
   *     should be the value.
   */
  goog.style.setStyle = function(element, style, opt_value) {
    if (goog.isString(style)) {
      goog.style.setStyle_(element, opt_value, style);
    } else {
      for (var key in style) {
        goog.style.setStyle_(element, style[key], key);
      }
    }
  };
  
  
  /**
   * Sets a style value on an element, with parameters swapped to work with
   * {@code goog.object.forEach()}. Prepends a vendor-specific prefix when
   * necessary.
   * @param {Element} element The element to change.
   * @param {string|number|boolean|undefined} value Style value.
   * @param {string} style Style name.
   * @private
   */
  goog.style.setStyle_ = function(element, value, style) {
    var propertyName = goog.style.getVendorJsStyleName_(element, style);
  
    if (propertyName) {
      // TODO(johnlenz): coerce to string?
      element.style[propertyName] = /** @type {?} */ (value);
    }
  };
  
  
  /**
   * Style name cache that stores previous property name lookups.
   *
   * This is used by setStyle to speed up property lookups, entries look like:
   *   { StyleName: ActualPropertyName }
   *
   * @private {!Object<string, string>}
   */
  goog.style.styleNameCache_ = {};
  
  
  /**
   * Returns the style property name in camel-case. If it does not exist and a
   * vendor-specific version of the property does exist, then return the vendor-
   * specific property name instead.
   * @param {Element} element The element to change.
   * @param {string} style Style name.
   * @return {string} Vendor-specific style.
   * @private
   */
  goog.style.getVendorJsStyleName_ = function(element, style) {
    var propertyName = goog.style.styleNameCache_[style];
    if (!propertyName) {
      var camelStyle = goog.string.toCamelCase(style);
      propertyName = camelStyle;
  
      if (element.style[camelStyle] === undefined) {
        var prefixedStyle = goog.dom.vendor.getVendorJsPrefix() +
            goog.string.toTitleCase(camelStyle);
  
        if (element.style[prefixedStyle] !== undefined) {
          propertyName = prefixedStyle;
        }
      }
      goog.style.styleNameCache_[style] = propertyName;
    }
  
    return propertyName;
  };
  
  
  /**
   * Returns the style property name in CSS notation. If it does not exist and a
   * vendor-specific version of the property does exist, then return the vendor-
   * specific property name instead.
   * @param {Element} element The element to change.
   * @param {string} style Style name.
   * @return {string} Vendor-specific style.
   * @private
   */
  goog.style.getVendorStyleName_ = function(element, style) {
    var camelStyle = goog.string.toCamelCase(style);
  
    if (element.style[camelStyle] === undefined) {
      var prefixedStyle = goog.dom.vendor.getVendorJsPrefix() +
          goog.string.toTitleCase(camelStyle);
  
      if (element.style[prefixedStyle] !== undefined) {
        return goog.dom.vendor.getVendorPrefix() + '-' + style;
      }
    }
  
    return style;
  };
  
  
  /**
   * Retrieves an explicitly-set style value of a node. This returns '' if there
   * isn't a style attribute on the element or if this style property has not been
   * explicitly set in script.
   *
   * @param {Element} element Element to get style of.
   * @param {string} property Property to get, css-style (if you have a camel-case
   * property, use element.style[style]).
   * @return {string} Style value.
   */
  goog.style.getStyle = function(element, property) {
    // element.style is '' for well-known properties which are unset.
    // For for browser specific styles as 'filter' is undefined
    // so we need to return '' explicitly to make it consistent across
    // browsers.
    var styleValue = element.style[goog.string.toCamelCase(property)];
  
    // Using typeof here because of a bug in Safari 5.1, where this value
    // was undefined, but === undefined returned false.
    if (typeof(styleValue) !== 'undefined') {
      return styleValue;
    }
  
    return element.style[goog.style.getVendorJsStyleName_(element, property)] ||
        '';
  };
  
  
  /**
   * Retrieves a computed style value of a node. It returns empty string if the
   * value cannot be computed (which will be the case in Internet Explorer) or
   * "none" if the property requested is an SVG one and it has not been
   * explicitly set (firefox and webkit).
   *
   * @param {Element} element Element to get style of.
   * @param {string} property Property to get (camel-case).
   * @return {string} Style value.
   */
  goog.style.getComputedStyle = function(element, property) {
    var doc = goog.dom.getOwnerDocument(element);
    if (doc.defaultView && doc.defaultView.getComputedStyle) {
      var styles = doc.defaultView.getComputedStyle(element, null);
      if (styles) {
        // element.style[..] is undefined for browser specific styles
        // as 'filter'.
        return styles[property] || styles.getPropertyValue(property) || '';
      }
    }
  
    return '';
  };
  
  
  /**
   * Gets the cascaded style value of a node, or null if the value cannot be
   * computed (only Internet Explorer can do this).
   *
   * @param {Element} element Element to get style of.
   * @param {string} style Property to get (camel-case).
   * @return {string} Style value.
   */
  goog.style.getCascadedStyle = function(element, style) {
    // TODO(nicksantos): This should be documented to return null. #fixTypes
    return /** @type {string} */ (
        element.currentStyle ? element.currentStyle[style] : null);
  };
  
  
  /**
   * Cross-browser pseudo get computed style. It returns the computed style where
   * available. If not available it tries the cascaded style value (IE
   * currentStyle) and in worst case the inline style value.  It shouldn't be
   * called directly, see http://wiki/Main/ComputedStyleVsCascadedStyle for
   * discussion.
   *
   * @param {Element} element Element to get style of.
   * @param {string} style Property to get (must be camelCase, not css-style.).
   * @return {string} Style value.
   * @private
   */
  goog.style.getStyle_ = function(element, style) {
    return goog.style.getComputedStyle(element, style) ||
        goog.style.getCascadedStyle(element, style) ||
        (element.style && element.style[style]);
  };
  
  
  /**
   * Retrieves the computed value of the box-sizing CSS attribute.
   * Browser support: http://caniuse.com/css3-boxsizing.
   * @param {!Element} element The element whose box-sizing to get.
   * @return {?string} 'content-box', 'border-box' or 'padding-box'. null if
   *     box-sizing is not supported (IE7 and below).
   */
  goog.style.getComputedBoxSizing = function(element) {
    return goog.style.getStyle_(element, 'boxSizing') ||
        goog.style.getStyle_(element, 'MozBoxSizing') ||
        goog.style.getStyle_(element, 'WebkitBoxSizing') || null;
  };
  
  
  /**
   * Retrieves the computed value of the position CSS attribute.
   * @param {Element} element The element to get the position of.
   * @return {string} Position value.
   */
  goog.style.getComputedPosition = function(element) {
    return goog.style.getStyle_(element, 'position');
  };
  
  
  /**
   * Retrieves the computed background color string for a given element. The
   * string returned is suitable for assigning to another element's
   * background-color, but is not guaranteed to be in any particular string
   * format. Accessing the color in a numeric form may not be possible in all
   * browsers or with all input.
   *
   * If the background color for the element is defined as a hexadecimal value,
   * the resulting string can be parsed by goog.color.parse in all supported
   * browsers.
   *
   * Whether named colors like "red" or "lightblue" get translated into a
   * format which can be parsed is browser dependent. Calling this function on
   * transparent elements will return "transparent" in most browsers or
   * "rgba(0, 0, 0, 0)" in WebKit.
   * @param {Element} element The element to get the background color of.
   * @return {string} The computed string value of the background color.
   */
  goog.style.getBackgroundColor = function(element) {
    return goog.style.getStyle_(element, 'backgroundColor');
  };
  
  
  /**
   * Retrieves the computed value of the overflow-x CSS attribute.
   * @param {Element} element The element to get the overflow-x of.
   * @return {string} The computed string value of the overflow-x attribute.
   */
  goog.style.getComputedOverflowX = function(element) {
    return goog.style.getStyle_(element, 'overflowX');
  };
  
  
  /**
   * Retrieves the computed value of the overflow-y CSS attribute.
   * @param {Element} element The element to get the overflow-y of.
   * @return {string} The computed string value of the overflow-y attribute.
   */
  goog.style.getComputedOverflowY = function(element) {
    return goog.style.getStyle_(element, 'overflowY');
  };
  
  
  /**
   * Retrieves the computed value of the z-index CSS attribute.
   * @param {Element} element The element to get the z-index of.
   * @return {string|number} The computed value of the z-index attribute.
   */
  goog.style.getComputedZIndex = function(element) {
    return goog.style.getStyle_(element, 'zIndex');
  };
  
  
  /**
   * Retrieves the computed value of the text-align CSS attribute.
   * @param {Element} element The element to get the text-align of.
   * @return {string} The computed string value of the text-align attribute.
   */
  goog.style.getComputedTextAlign = function(element) {
    return goog.style.getStyle_(element, 'textAlign');
  };
  
  
  /**
   * Retrieves the computed value of the cursor CSS attribute.
   * @param {Element} element The element to get the cursor of.
   * @return {string} The computed string value of the cursor attribute.
   */
  goog.style.getComputedCursor = function(element) {
    return goog.style.getStyle_(element, 'cursor');
  };
  
  
  /**
   * Retrieves the computed value of the CSS transform attribute.
   * @param {Element} element The element to get the transform of.
   * @return {string} The computed string representation of the transform matrix.
   */
  goog.style.getComputedTransform = function(element) {
    var property = goog.style.getVendorStyleName_(element, 'transform');
    return goog.style.getStyle_(element, property) ||
        goog.style.getStyle_(element, 'transform');
  };
  
  
  /**
   * Sets the top/left values of an element.  If no unit is specified in the
   * argument then it will add px. The second argument is required if the first
   * argument is a string or number and is ignored if the first argument
   * is a coordinate.
   * @param {Element} el Element to move.
   * @param {string|number|goog.math.Coordinate} arg1 Left position or coordinate.
   * @param {string|number=} opt_arg2 Top position.
   */
  goog.style.setPosition = function(el, arg1, opt_arg2) {
    var x, y;
  
    if (arg1 instanceof goog.math.Coordinate) {
      x = arg1.x;
      y = arg1.y;
    } else {
      x = arg1;
      y = opt_arg2;
    }
  
    el.style.left = goog.style.getPixelStyleValue_(
        /** @type {number|string} */ (x), false);
    el.style.top = goog.style.getPixelStyleValue_(
        /** @type {number|string} */ (y), false);
  };
  
  
  /**
   * Gets the offsetLeft and offsetTop properties of an element and returns them
   * in a Coordinate object
   * @param {Element} element Element.
   * @return {!goog.math.Coordinate} The position.
   */
  goog.style.getPosition = function(element) {
    return new goog.math.Coordinate(
        /** @type {!HTMLElement} */ (element).offsetLeft,
        /** @type {!HTMLElement} */ (element).offsetTop);
  };
  
  
  /**
   * Returns the viewport element for a particular document
   * @param {Node=} opt_node DOM node (Document is OK) to get the viewport element
   *     of.
   * @return {Element} document.documentElement or document.body.
   */
  goog.style.getClientViewportElement = function(opt_node) {
    var doc;
    if (opt_node) {
      doc = goog.dom.getOwnerDocument(opt_node);
    } else {
      doc = goog.dom.getDocument();
    }
  
    // In old IE versions the document.body represented the viewport
    if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9) &&
        !goog.dom.getDomHelper(doc).isCss1CompatMode()) {
      return doc.body;
    }
    return doc.documentElement;
  };
  
  
  /**
   * Calculates the viewport coordinates relative to the page/document
   * containing the node. The viewport may be the browser viewport for
   * non-iframe document, or the iframe container for iframe'd document.
   * @param {!Document} doc The document to use as the reference point.
   * @return {!goog.math.Coordinate} The page offset of the viewport.
   */
  goog.style.getViewportPageOffset = function(doc) {
    var body = doc.body;
    var documentElement = doc.documentElement;
    var scrollLeft = body.scrollLeft || documentElement.scrollLeft;
    var scrollTop = body.scrollTop || documentElement.scrollTop;
    return new goog.math.Coordinate(scrollLeft, scrollTop);
  };
  
  
  /**
   * Gets the client rectangle of the DOM element.
   *
   * getBoundingClientRect is part of a new CSS object model draft (with a
   * long-time presence in IE), replacing the error-prone parent offset
   * computation and the now-deprecated Gecko getBoxObjectFor.
   *
   * This utility patches common browser bugs in getBoundingClientRect. It
   * will fail if getBoundingClientRect is unsupported.
   *
   * If the element is not in the DOM, the result is undefined, and an error may
   * be thrown depending on user agent.
   *
   * @param {!Element} el The element whose bounding rectangle is being queried.
   * @return {Object} A native bounding rectangle with numerical left, top,
   *     right, and bottom.  Reported by Firefox to be of object type ClientRect.
   * @private
   */
  goog.style.getBoundingClientRect_ = function(el) {
    var rect;
    try {
      rect = el.getBoundingClientRect();
    } catch (e) {
      // In IE < 9, calling getBoundingClientRect on an orphan element raises an
      // "Unspecified Error". All other browsers return zeros.
      return {'left': 0, 'top': 0, 'right': 0, 'bottom': 0};
    }
  
    // Patch the result in IE only, so that this function can be inlined if
    // compiled for non-IE.
    if (goog.userAgent.IE && el.ownerDocument.body) {
      // In IE, most of the time, 2 extra pixels are added to the top and left
      // due to the implicit 2-pixel inset border.  In IE6/7 quirks mode and
      // IE6 standards mode, this border can be overridden by setting the
      // document element's border to zero -- thus, we cannot rely on the
      // offset always being 2 pixels.
  
      // In quirks mode, the offset can be determined by querying the body's
      // clientLeft/clientTop, but in standards mode, it is found by querying
      // the document element's clientLeft/clientTop.  Since we already called
      // getBoundingClientRect we have already forced a reflow, so it is not
      // too expensive just to query them all.
  
      // See: http://msdn.microsoft.com/en-us/library/ms536433(VS.85).aspx
      var doc = el.ownerDocument;
      rect.left -= doc.documentElement.clientLeft + doc.body.clientLeft;
      rect.top -= doc.documentElement.clientTop + doc.body.clientTop;
    }
    return rect;
  };
  
  
  /**
   * Returns the first parent that could affect the position of a given element.
   * @param {Element} element The element to get the offset parent for.
   * @return {Element} The first offset parent or null if one cannot be found.
   */
  goog.style.getOffsetParent = function(element) {
    // element.offsetParent does the right thing in IE7 and below.  In other
    // browsers it only includes elements with position absolute, relative or
    // fixed, not elements with overflow set to auto or scroll.
    if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(8)) {
      goog.asserts.assert(element && 'offsetParent' in element);
      return element.offsetParent;
    }
  
    var doc = goog.dom.getOwnerDocument(element);
    var positionStyle = goog.style.getStyle_(element, 'position');
    var skipStatic = positionStyle == 'fixed' || positionStyle == 'absolute';
    for (var parent = element.parentNode; parent && parent != doc;
         parent = parent.parentNode) {
      // Skip shadowDOM roots.
      if (parent.nodeType == goog.dom.NodeType.DOCUMENT_FRAGMENT && parent.host) {
        parent = parent.host;
      }
      positionStyle =
          goog.style.getStyle_(/** @type {!Element} */ (parent), 'position');
      skipStatic = skipStatic && positionStyle == 'static' &&
          parent != doc.documentElement && parent != doc.body;
      if (!skipStatic &&
          (parent.scrollWidth > parent.clientWidth ||
           parent.scrollHeight > parent.clientHeight ||
           positionStyle == 'fixed' || positionStyle == 'absolute' ||
           positionStyle == 'relative')) {
        return /** @type {!Element} */ (parent);
      }
    }
    return null;
  };
  
  
  /**
   * Calculates and returns the visible rectangle for a given element. Returns a
   * box describing the visible portion of the nearest scrollable offset ancestor.
   * Coordinates are given relative to the document.
   *
   * @param {Element} element Element to get the visible rect for.
   * @return {goog.math.Box} Bounding elementBox describing the visible rect or
   *     null if scrollable ancestor isn't inside the visible viewport.
   */
  goog.style.getVisibleRectForElement = function(element) {
    var visibleRect = new goog.math.Box(0, Infinity, Infinity, 0);
    var dom = goog.dom.getDomHelper(element);
    var body = dom.getDocument().body;
    var documentElement = dom.getDocument().documentElement;
    var scrollEl = dom.getDocumentScrollElement();
  
    // Determine the size of the visible rect by climbing the dom accounting for
    // all scrollable containers.
    for (var el = element; el = goog.style.getOffsetParent(el);) {
      // clientWidth is zero for inline block elements in IE.
      // on WEBKIT, body element can have clientHeight = 0 and scrollHeight > 0
      if ((!goog.userAgent.IE || el.clientWidth != 0) &&
          (!goog.userAgent.WEBKIT || el.clientHeight != 0 || el != body) &&
          // body may have overflow set on it, yet we still get the entire
          // viewport. In some browsers, el.offsetParent may be
          // document.documentElement, so check for that too.
          (el != body && el != documentElement &&
           goog.style.getStyle_(el, 'overflow') != 'visible')) {
        var pos = goog.style.getPageOffset(el);
        var client = goog.style.getClientLeftTop(el);
        pos.x += client.x;
        pos.y += client.y;
  
        visibleRect.top = Math.max(visibleRect.top, pos.y);
        visibleRect.right = Math.min(visibleRect.right, pos.x + el.clientWidth);
        visibleRect.bottom =
            Math.min(visibleRect.bottom, pos.y + el.clientHeight);
        visibleRect.left = Math.max(visibleRect.left, pos.x);
      }
    }
  
    // Clip by window's viewport.
    var scrollX = scrollEl.scrollLeft, scrollY = scrollEl.scrollTop;
    visibleRect.left = Math.max(visibleRect.left, scrollX);
    visibleRect.top = Math.max(visibleRect.top, scrollY);
    var winSize = dom.getViewportSize();
    visibleRect.right = Math.min(visibleRect.right, scrollX + winSize.width);
    visibleRect.bottom = Math.min(visibleRect.bottom, scrollY + winSize.height);
    return visibleRect.top >= 0 && visibleRect.left >= 0 &&
            visibleRect.bottom > visibleRect.top &&
            visibleRect.right > visibleRect.left ?
        visibleRect :
        null;
  };
  
  
  /**
   * Calculate the scroll position of {@code container} with the minimum amount so
   * that the content and the borders of the given {@code element} become visible.
   * If the element is bigger than the container, its top left corner will be
   * aligned as close to the container's top left corner as possible.
   *
   * @param {Element} element The element to make visible.
   * @param {Element=} opt_container The container to scroll. If not set, then the
   *     document scroll element will be used.
   * @param {boolean=} opt_center Whether to center the element in the container.
   *     Defaults to false.
   * @return {!goog.math.Coordinate} The new scroll position of the container,
   *     in form of goog.math.Coordinate(scrollLeft, scrollTop).
   */
  goog.style.getContainerOffsetToScrollInto = function(
      element, opt_container, opt_center) {
    var container = opt_container || goog.dom.getDocumentScrollElement();
    // Absolute position of the element's border's top left corner.
    var elementPos = goog.style.getPageOffset(element);
    // Absolute position of the container's border's top left corner.
    var containerPos = goog.style.getPageOffset(container);
    var containerBorder = goog.style.getBorderBox(container);
    if (container == goog.dom.getDocumentScrollElement()) {
      // The element position is calculated based on the page offset, and the
      // document scroll element holds the scroll position within the page. We can
      // use the scroll position to calculate the relative position from the
      // element.
      var relX = elementPos.x - container.scrollLeft;
      var relY = elementPos.y - container.scrollTop;
      if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(10)) {
        // In older versions of IE getPageOffset(element) does not include the
        // container border so it has to be added to accommodate.
        relX += containerBorder.left;
        relY += containerBorder.top;
      }
    } else {
      // Relative pos. of the element's border box to the container's content box.
      var relX = elementPos.x - containerPos.x - containerBorder.left;
      var relY = elementPos.y - containerPos.y - containerBorder.top;
    }
    // How much the element can move in the container, i.e. the difference between
    // the element's bottom-right-most and top-left-most position where it's
    // fully visible.
    var elementSize = goog.style.getSizeWithDisplay_(element);
    var spaceX = container.clientWidth - elementSize.width;
    var spaceY = container.clientHeight - elementSize.height;
    var scrollLeft = container.scrollLeft;
    var scrollTop = container.scrollTop;
    if (opt_center) {
      // All browsers round non-integer scroll positions down.
      scrollLeft += relX - spaceX / 2;
      scrollTop += relY - spaceY / 2;
    } else {
      // This formula was designed to give the correct scroll values in the
      // following cases:
      // - element is higher than container (spaceY < 0) => scroll down by relY
      // - element is not higher that container (spaceY >= 0):
      //   - it is above container (relY < 0) => scroll up by abs(relY)
      //   - it is below container (relY > spaceY) => scroll down by relY - spaceY
      //   - it is in the container => don't scroll
      scrollLeft += Math.min(relX, Math.max(relX - spaceX, 0));
      scrollTop += Math.min(relY, Math.max(relY - spaceY, 0));
    }
    return new goog.math.Coordinate(scrollLeft, scrollTop);
  };
  
  
  /**
   * Changes the scroll position of {@code container} with the minimum amount so
   * that the content and the borders of the given {@code element} become visible.
   * If the element is bigger than the container, its top left corner will be
   * aligned as close to the container's top left corner as possible.
   *
   * @param {Element} element The element to make visible.
   * @param {Element=} opt_container The container to scroll. If not set, then the
   *     document scroll element will be used.
   * @param {boolean=} opt_center Whether to center the element in the container.
   *     Defaults to false.
   */
  goog.style.scrollIntoContainerView = function(
      element, opt_container, opt_center) {
    var container = opt_container || goog.dom.getDocumentScrollElement();
    var offset =
        goog.style.getContainerOffsetToScrollInto(element, container, opt_center);
    container.scrollLeft = offset.x;
    container.scrollTop = offset.y;
  };
  
  
  /**
   * Returns clientLeft (width of the left border and, if the directionality is
   * right to left, the vertical scrollbar) and clientTop as a coordinate object.
   *
   * @param {Element} el Element to get clientLeft for.
   * @return {!goog.math.Coordinate} Client left and top.
   */
  goog.style.getClientLeftTop = function(el) {
    return new goog.math.Coordinate(el.clientLeft, el.clientTop);
  };
  
  
  /**
   * Returns a Coordinate object relative to the top-left of the HTML document.
   * Implemented as a single function to save having to do two recursive loops in
   * opera and safari just to get both coordinates.  If you just want one value do
   * use goog.style.getPageOffsetLeft() and goog.style.getPageOffsetTop(), but
   * note if you call both those methods the tree will be analysed twice.
   *
   * @param {Element} el Element to get the page offset for.
   * @return {!goog.math.Coordinate} The page offset.
   */
  goog.style.getPageOffset = function(el) {
    var doc = goog.dom.getOwnerDocument(el);
    // TODO(gboyer): Update the jsdoc in a way that doesn't break the universe.
    goog.asserts.assertObject(el, 'Parameter is required');
  
    // NOTE(arv): If element is hidden (display none or disconnected or any the
    // ancestors are hidden) we get (0,0) by default but we still do the
    // accumulation of scroll position.
  
    // TODO(arv): Should we check if the node is disconnected and in that case
    //            return (0,0)?
  
    var pos = new goog.math.Coordinate(0, 0);
    var viewportElement = goog.style.getClientViewportElement(doc);
    if (el == viewportElement) {
      // viewport is always at 0,0 as that defined the coordinate system for this
      // function - this avoids special case checks in the code below
      return pos;
    }
  
    var box = goog.style.getBoundingClientRect_(el);
    // Must add the scroll coordinates in to get the absolute page offset
    // of element since getBoundingClientRect returns relative coordinates to
    // the viewport.
    var scrollCoord = goog.dom.getDomHelper(doc).getDocumentScroll();
    pos.x = box.left + scrollCoord.x;
    pos.y = box.top + scrollCoord.y;
  
    return pos;
  };
  
  
  /**
   * Returns the left coordinate of an element relative to the HTML document
   * @param {Element} el Elements.
   * @return {number} The left coordinate.
   */
  goog.style.getPageOffsetLeft = function(el) {
    return goog.style.getPageOffset(el).x;
  };
  
  
  /**
   * Returns the top coordinate of an element relative to the HTML document
   * @param {Element} el Elements.
   * @return {number} The top coordinate.
   */
  goog.style.getPageOffsetTop = function(el) {
    return goog.style.getPageOffset(el).y;
  };
  
  
  /**
   * Returns a Coordinate object relative to the top-left of an HTML document
   * in an ancestor frame of this element. Used for measuring the position of
   * an element inside a frame relative to a containing frame.
   *
   * @param {Element} el Element to get the page offset for.
   * @param {Window} relativeWin The window to measure relative to. If relativeWin
   *     is not in the ancestor frame chain of the element, we measure relative to
   *     the top-most window.
   * @return {!goog.math.Coordinate} The page offset.
   */
  goog.style.getFramedPageOffset = function(el, relativeWin) {
    var position = new goog.math.Coordinate(0, 0);
  
    // Iterate up the ancestor frame chain, keeping track of the current window
    // and the current element in that window.
    var currentWin = goog.dom.getWindow(goog.dom.getOwnerDocument(el));
  
    // MS Edge throws when accessing "parent" if el's containing iframe has been
    // deleted.
    if (!goog.reflect.canAccessProperty(currentWin, 'parent')) {
      return position;
    }
  
    var currentEl = el;
    do {
      // if we're at the top window, we want to get the page offset.
      // if we're at an inner frame, we only want to get the window position
      // so that we can determine the actual page offset in the context of
      // the outer window.
      var offset = currentWin == relativeWin ?
          goog.style.getPageOffset(currentEl) :
          goog.style.getClientPositionForElement_(goog.asserts.assert(currentEl));
  
      position.x += offset.x;
      position.y += offset.y;
    } while (currentWin && currentWin != relativeWin &&
             currentWin != currentWin.parent &&
             (currentEl = currentWin.frameElement) &&
             (currentWin = currentWin.parent));
  
    return position;
  };
  
  
  /**
   * Translates the specified rect relative to origBase page, for newBase page.
   * If origBase and newBase are the same, this function does nothing.
   *
   * @param {goog.math.Rect} rect The source rectangle relative to origBase page,
   *     and it will have the translated result.
   * @param {goog.dom.DomHelper} origBase The DomHelper for the input rectangle.
   * @param {goog.dom.DomHelper} newBase The DomHelper for the resultant
   *     coordinate.  This must be a DOM for an ancestor frame of origBase
   *     or the same as origBase.
   */
  goog.style.translateRectForAnotherFrame = function(rect, origBase, newBase) {
    if (origBase.getDocument() != newBase.getDocument()) {
      var body = origBase.getDocument().body;
      var pos = goog.style.getFramedPageOffset(body, newBase.getWindow());
  
      // Adjust Body's margin.
      pos = goog.math.Coordinate.difference(pos, goog.style.getPageOffset(body));
  
      if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9) &&
          !origBase.isCss1CompatMode()) {
        pos = goog.math.Coordinate.difference(pos, origBase.getDocumentScroll());
      }
  
      rect.left += pos.x;
      rect.top += pos.y;
    }
  };
  
  
  /**
   * Returns the position of an element relative to another element in the
   * document.  A relative to B
   * @param {Element|Event|goog.events.Event} a Element or mouse event whose
   *     position we're calculating.
   * @param {Element|Event|goog.events.Event} b Element or mouse event position
   *     is relative to.
   * @return {!goog.math.Coordinate} The relative position.
   */
  goog.style.getRelativePosition = function(a, b) {
    var ap = goog.style.getClientPosition(a);
    var bp = goog.style.getClientPosition(b);
    return new goog.math.Coordinate(ap.x - bp.x, ap.y - bp.y);
  };
  
  
  /**
   * Returns the position of the event or the element's border box relative to
   * the client viewport.
   * @param {!Element} el Element whose position to get.
   * @return {!goog.math.Coordinate} The position.
   * @private
   */
  goog.style.getClientPositionForElement_ = function(el) {
    var box = goog.style.getBoundingClientRect_(el);
    return new goog.math.Coordinate(box.left, box.top);
  };
  
  
  /**
   * Returns the position of the event or the element's border box relative to
   * the client viewport. If an event is passed, and if this event is a "touch"
   * event, then the position of the first changedTouches will be returned.
   * @param {Element|Event|goog.events.Event} el Element or a mouse / touch event.
   * @return {!goog.math.Coordinate} The position.
   */
  goog.style.getClientPosition = function(el) {
    goog.asserts.assert(el);
    if (el.nodeType == goog.dom.NodeType.ELEMENT) {
      return goog.style.getClientPositionForElement_(
          /** @type {!Element} */ (el));
    } else {
      var targetEvent = el.changedTouches ? el.changedTouches[0] : el;
      return new goog.math.Coordinate(targetEvent.clientX, targetEvent.clientY);
    }
  };
  
  
  /**
   * Moves an element to the given coordinates relative to the client viewport.
   * @param {Element} el Absolutely positioned element to set page offset for.
   *     It must be in the document.
   * @param {number|goog.math.Coordinate} x Left position of the element's margin
   *     box or a coordinate object.
   * @param {number=} opt_y Top position of the element's margin box.
   */
  goog.style.setPageOffset = function(el, x, opt_y) {
    // Get current pageoffset
    var cur = goog.style.getPageOffset(el);
  
    if (x instanceof goog.math.Coordinate) {
      opt_y = x.y;
      x = x.x;
    }
  
    // NOTE(arv): We cannot allow strings for x and y. We could but that would
    // require us to manually transform between different units
  
    // Work out deltas
    var dx = goog.asserts.assertNumber(x) - cur.x;
    var dy = Number(opt_y) - cur.y;
  
    // Set position to current left/top + delta
    goog.style.setPosition(
        el, /** @type {!HTMLElement} */ (el).offsetLeft + dx,
        /** @type {!HTMLElement} */ (el).offsetTop + dy);
  };
  
  
  /**
   * Sets the width/height values of an element.  If an argument is numeric,
   * or a goog.math.Size is passed, it is assumed to be pixels and will add
   * 'px' after converting it to an integer in string form. (This just sets the
   * CSS width and height properties so it might set content-box or border-box
   * size depending on the box model the browser is using.)
   *
   * @param {Element} element Element to set the size of.
   * @param {string|number|goog.math.Size} w Width of the element, or a
   *     size object.
   * @param {string|number=} opt_h Height of the element. Required if w is not a
   *     size object.
   */
  goog.style.setSize = function(element, w, opt_h) {
    var h;
    if (w instanceof goog.math.Size) {
      h = w.height;
      w = w.width;
    } else {
      if (opt_h == undefined) {
        throw new Error('missing height argument');
      }
      h = opt_h;
    }
  
    goog.style.setWidth(element, /** @type {string|number} */ (w));
    goog.style.setHeight(element, h);
  };
  
  
  /**
   * Helper function to create a string to be set into a pixel-value style
   * property of an element. Can round to the nearest integer value.
   *
   * @param {string|number} value The style value to be used. If a number,
   *     'px' will be appended, otherwise the value will be applied directly.
   * @param {boolean} round Whether to round the nearest integer (if property
   *     is a number).
   * @return {string} The string value for the property.
   * @private
   */
  goog.style.getPixelStyleValue_ = function(value, round) {
    if (typeof value == 'number') {
      value = (round ? Math.round(value) : value) + 'px';
    }
  
    return value;
  };
  
  
  /**
   * Set the height of an element.  Sets the element's style property.
   * @param {Element} element Element to set the height of.
   * @param {string|number} height The height value to set.  If a number, 'px'
   *     will be appended, otherwise the value will be applied directly.
   */
  goog.style.setHeight = function(element, height) {
    element.style.height = goog.style.getPixelStyleValue_(height, true);
  };
  
  
  /**
   * Set the width of an element.  Sets the element's style property.
   * @param {Element} element Element to set the width of.
   * @param {string|number} width The width value to set.  If a number, 'px'
   *     will be appended, otherwise the value will be applied directly.
   */
  goog.style.setWidth = function(element, width) {
    element.style.width = goog.style.getPixelStyleValue_(width, true);
  };
  
  
  /**
   * Gets the height and width of an element, even if its display is none.
   *
   * Specifically, this returns the height and width of the border box,
   * irrespective of the box model in effect.
   *
   * Note that this function does not take CSS transforms into account. Please see
   * {@code goog.style.getTransformedSize}.
   * @param {Element} element Element to get size of.
   * @return {!goog.math.Size} Object with width/height properties.
   */
  goog.style.getSize = function(element) {
    return goog.style.evaluateWithTemporaryDisplay_(
        goog.style.getSizeWithDisplay_, /** @type {!Element} */ (element));
  };
  
  
  /**
   * Call {@code fn} on {@code element} such that {@code element}'s dimensions are
   * accurate when it's passed to {@code fn}.
   * @param {function(!Element): T} fn Function to call with {@code element} as
   *     an argument after temporarily changing {@code element}'s display such
   *     that its dimensions are accurate.
   * @param {!Element} element Element (which may have display none) to use as
   *     argument to {@code fn}.
   * @return {T} Value returned by calling {@code fn} with {@code element}.
   * @template T
   * @private
   */
  goog.style.evaluateWithTemporaryDisplay_ = function(fn, element) {
    if (goog.style.getStyle_(element, 'display') != 'none') {
      return fn(element);
    }
  
    var style = element.style;
    var originalDisplay = style.display;
    var originalVisibility = style.visibility;
    var originalPosition = style.position;
  
    style.visibility = 'hidden';
    style.position = 'absolute';
    style.display = 'inline';
  
    var retVal = fn(element);
  
    style.display = originalDisplay;
    style.position = originalPosition;
    style.visibility = originalVisibility;
  
    return retVal;
  };
  
  
  /**
   * Gets the height and width of an element when the display is not none.
   * @param {Element} element Element to get size of.
   * @return {!goog.math.Size} Object with width/height properties.
   * @private
   */
  goog.style.getSizeWithDisplay_ = function(element) {
    var offsetWidth = /** @type {!HTMLElement} */ (element).offsetWidth;
    var offsetHeight = /** @type {!HTMLElement} */ (element).offsetHeight;
    var webkitOffsetsZero =
        goog.userAgent.WEBKIT && !offsetWidth && !offsetHeight;
    if ((!goog.isDef(offsetWidth) || webkitOffsetsZero) &&
        element.getBoundingClientRect) {
      // Fall back to calling getBoundingClientRect when offsetWidth or
      // offsetHeight are not defined, or when they are zero in WebKit browsers.
      // This makes sure that we return for the correct size for SVG elements, but
      // will still return 0 on Webkit prior to 534.8, see
      // http://trac.webkit.org/changeset/67252.
      var clientRect = goog.style.getBoundingClientRect_(element);
      return new goog.math.Size(
          clientRect.right - clientRect.left, clientRect.bottom - clientRect.top);
    }
    return new goog.math.Size(offsetWidth, offsetHeight);
  };
  
  
  /**
   * Gets the height and width of an element, post transform, even if its display
   * is none.
   *
   * This is like {@code goog.style.getSize}, except:
   * <ol>
   * <li>Takes webkitTransforms such as rotate and scale into account.
   * <li>Will return null if {@code element} doesn't respond to
   *     {@code getBoundingClientRect}.
   * <li>Currently doesn't make sense on non-WebKit browsers which don't support
   *    webkitTransforms.
   * </ol>
   * @param {!Element} element Element to get size of.
   * @return {goog.math.Size} Object with width/height properties.
   */
  goog.style.getTransformedSize = function(element) {
    if (!element.getBoundingClientRect) {
      return null;
    }
  
    var clientRect = goog.style.evaluateWithTemporaryDisplay_(
        goog.style.getBoundingClientRect_, element);
    return new goog.math.Size(
        clientRect.right - clientRect.left, clientRect.bottom - clientRect.top);
  };
  
  
  /**
   * Returns a bounding rectangle for a given element in page space.
   * @param {Element} element Element to get bounds of. Must not be display none.
   * @return {!goog.math.Rect} Bounding rectangle for the element.
   */
  goog.style.getBounds = function(element) {
    var o = goog.style.getPageOffset(element);
    var s = goog.style.getSize(element);
    return new goog.math.Rect(o.x, o.y, s.width, s.height);
  };
  
  
  /**
   * Converts a CSS selector in the form style-property to styleProperty.
   * @param {*} selector CSS Selector.
   * @return {string} Camel case selector.
   * @deprecated Use goog.string.toCamelCase instead.
   */
  goog.style.toCamelCase = function(selector) {
    return goog.string.toCamelCase(String(selector));
  };
  
  
  /**
   * Converts a CSS selector in the form styleProperty to style-property.
   * @param {string} selector Camel case selector.
   * @return {string} Selector cased.
   * @deprecated Use goog.string.toSelectorCase instead.
   */
  goog.style.toSelectorCase = function(selector) {
    return goog.string.toSelectorCase(selector);
  };
  
  
  /**
   * Gets the opacity of a node (x-browser). This gets the inline style opacity
   * of the node, and does not take into account the cascaded or the computed
   * style for this node.
   * @param {Element} el Element whose opacity has to be found.
   * @return {number|string} Opacity between 0 and 1 or an empty string {@code ''}
   *     if the opacity is not set.
   */
  goog.style.getOpacity = function(el) {
    goog.asserts.assert(el);
    var style = el.style;
    var result = '';
    if ('opacity' in style) {
      result = style.opacity;
    } else if ('MozOpacity' in style) {
      result = style.MozOpacity;
    } else if ('filter' in style) {
      var match = style.filter.match(/alpha\(opacity=([\d.]+)\)/);
      if (match) {
        result = String(match[1] / 100);
      }
    }
    return result == '' ? result : Number(result);
  };
  
  
  /**
   * Sets the opacity of a node (x-browser).
   * @param {Element} el Elements whose opacity has to be set.
   * @param {number|string} alpha Opacity between 0 and 1 or an empty string
   *     {@code ''} to clear the opacity.
   */
  goog.style.setOpacity = function(el, alpha) {
    goog.asserts.assert(el);
    var style = el.style;
    if ('opacity' in style) {
      style.opacity = alpha;
    } else if ('MozOpacity' in style) {
      style.MozOpacity = alpha;
    } else if ('filter' in style) {
      // TODO(arv): Overwriting the filter might have undesired side effects.
      if (alpha === '') {
        style.filter = '';
      } else {
        style.filter = 'alpha(opacity=' + (Number(alpha) * 100) + ')';
      }
    }
  };
  
  
  /**
   * Sets the background of an element to a transparent image in a browser-
   * independent manner.
   *
   * This function does not support repeating backgrounds or alternate background
   * positions to match the behavior of Internet Explorer. It also does not
   * support sizingMethods other than crop since they cannot be replicated in
   * browsers other than Internet Explorer.
   *
   * @param {Element} el The element to set background on.
   * @param {string} src The image source URL.
   */
  goog.style.setTransparentBackgroundImage = function(el, src) {
    var style = el.style;
    // It is safe to use the style.filter in IE only. In Safari 'filter' is in
    // style object but access to style.filter causes it to throw an exception.
    // Note: IE8 supports images with an alpha channel.
    if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('8')) {
      // See TODO in setOpacity.
      style.filter = 'progid:DXImageTransform.Microsoft.AlphaImageLoader(' +
          'src="' + src + '", sizingMethod="crop")';
    } else {
      // Set style properties individually instead of using background shorthand
      // to prevent overwriting a pre-existing background color.
      style.backgroundImage = 'url(' + src + ')';
      style.backgroundPosition = 'top left';
      style.backgroundRepeat = 'no-repeat';
    }
  };
  
  
  /**
   * Clears the background image of an element in a browser independent manner.
   * @param {Element} el The element to clear background image for.
   */
  goog.style.clearTransparentBackgroundImage = function(el) {
    var style = el.style;
    if ('filter' in style) {
      // See TODO in setOpacity.
      style.filter = '';
    } else {
      // Set style properties individually instead of using background shorthand
      // to prevent overwriting a pre-existing background color.
      style.backgroundImage = 'none';
    }
  };
  
  
  /**
   * Shows or hides an element from the page. Hiding the element is done by
   * setting the display property to "none", removing the element from the
   * rendering hierarchy so it takes up no space. To show the element, the default
   * inherited display property is restored (defined either in stylesheets or by
   * the browser's default style rules.)
   *
   * Caveat 1: if the inherited display property for the element is set to "none"
   * by the stylesheets, that is the property that will be restored by a call to
   * showElement(), effectively toggling the display between "none" and "none".
   *
   * Caveat 2: if the element display style is set inline (by setting either
   * element.style.display or a style attribute in the HTML), a call to
   * showElement will clear that setting and defer to the inherited style in the
   * stylesheet.
   * @param {Element} el Element to show or hide.
   * @param {*} display True to render the element in its default style,
   *     false to disable rendering the element.
   * @deprecated Use goog.style.setElementShown instead.
   */
  goog.style.showElement = function(el, display) {
    goog.style.setElementShown(el, display);
  };
  
  
  /**
   * Shows or hides an element from the page. Hiding the element is done by
   * setting the display property to "none", removing the element from the
   * rendering hierarchy so it takes up no space. To show the element, the default
   * inherited display property is restored (defined either in stylesheets or by
   * the browser's default style rules).
   *
   * Caveat 1: if the inherited display property for the element is set to "none"
   * by the stylesheets, that is the property that will be restored by a call to
   * setElementShown(), effectively toggling the display between "none" and
   * "none".
   *
   * Caveat 2: if the element display style is set inline (by setting either
   * element.style.display or a style attribute in the HTML), a call to
   * setElementShown will clear that setting and defer to the inherited style in
   * the stylesheet.
   * @param {Element} el Element to show or hide.
   * @param {*} isShown True to render the element in its default style,
   *     false to disable rendering the element.
   */
  goog.style.setElementShown = function(el, isShown) {
    el.style.display = isShown ? '' : 'none';
  };
  
  
  /**
   * Test whether the given element has been shown or hidden via a call to
   * {@link #setElementShown}.
   *
   * Note this is strictly a companion method for a call
   * to {@link #setElementShown} and the same caveats apply; in particular, this
   * method does not guarantee that the return value will be consistent with
   * whether or not the element is actually visible.
   *
   * @param {Element} el The element to test.
   * @return {boolean} Whether the element has been shown.
   * @see #setElementShown
   */
  goog.style.isElementShown = function(el) {
    return el.style.display != 'none';
  };
  
  
  /**
   * Installs the style sheet into the window that contains opt_node.  If
   * opt_node is null, the main window is used.
   * @param {!goog.html.SafeStyleSheet} safeStyleSheet The style sheet to install.
   * @param {?Node=} opt_node Node whose parent document should have the
   *     styles installed.
   * @return {!HTMLStyleElement|!StyleSheet} In IE<11, a StyleSheet object with no
   *     owning <style> tag (this is how IE creates style sheets).  In every other
   *     browser, a <style> element with an attached style.  This doesn't return a
   *     StyleSheet object so that setSafeStyleSheet can replace it (otherwise, if
   *     you pass a StyleSheet to setSafeStyleSheet, it will make a new StyleSheet
   *     and leave the original StyleSheet orphaned).
   */
  goog.style.installSafeStyleSheet = function(safeStyleSheet, opt_node) {
    var dh = goog.dom.getDomHelper(opt_node);
  
    // IE < 11 requires createStyleSheet. Note that doc.createStyleSheet will be
    // undefined as of IE 11.
    var doc = dh.getDocument();
    if (goog.userAgent.IE && doc.createStyleSheet) {
      var styleSheet = doc.createStyleSheet();
      goog.style.setSafeStyleSheet(styleSheet, safeStyleSheet);
      return styleSheet;
    } else {
      var head = dh.getElementsByTagNameAndClass(goog.dom.TagName.HEAD)[0];
  
      // In opera documents are not guaranteed to have a head element, thus we
      // have to make sure one exists before using it.
      if (!head) {
        var body = dh.getElementsByTagNameAndClass(goog.dom.TagName.BODY)[0];
        head = dh.createDom(goog.dom.TagName.HEAD);
        body.parentNode.insertBefore(head, body);
      }
      var el = dh.createDom(goog.dom.TagName.STYLE);
      // NOTE(user): Setting styles after the style element has been appended
      // to the head results in a nasty Webkit bug in certain scenarios. Please
      // refer to https://bugs.webkit.org/show_bug.cgi?id=26307 for additional
      // details.
      goog.style.setSafeStyleSheet(el, safeStyleSheet);
      dh.appendChild(head, el);
      return el;
    }
  };
  
  
  /**
   * Removes the styles added by {@link #installStyles}.
   * @param {Element|StyleSheet} styleSheet The value returned by
   *     {@link #installStyles}.
   */
  goog.style.uninstallStyles = function(styleSheet) {
    var node = styleSheet.ownerNode || styleSheet.owningElement ||
        /** @type {Element} */ (styleSheet);
    goog.dom.removeNode(node);
  };
  
  
  /**
   * Sets the content of a style element.  The style element can be any valid
   * style element.  This element will have its content completely replaced by
   * the safeStyleSheet.
   * @param {!Element|!StyleSheet} element A stylesheet element as returned by
   *     installStyles.
   * @param {!goog.html.SafeStyleSheet} safeStyleSheet The new content of the
   *     stylesheet.
   */
  goog.style.setSafeStyleSheet = function(element, safeStyleSheet) {
    var stylesString = goog.html.SafeStyleSheet.unwrap(safeStyleSheet);
    if (goog.userAgent.IE && goog.isDef(element.cssText)) {
      // Adding the selectors individually caused the browser to hang if the
      // selector was invalid or there were CSS comments.  Setting the cssText of
      // the style node works fine and ignores CSS that IE doesn't understand.
      // However IE >= 11 doesn't support cssText any more, so we make sure that
      // cssText is a defined property and otherwise fall back to innerHTML.
      element.cssText = stylesString;
    } else {
      // Setting textContent doesn't work in Safari, see b/29340337.
      element.innerHTML = stylesString;
    }
  };
  
  
  /**
   * Sets 'white-space: pre-wrap' for a node (x-browser).
   *
   * There are as many ways of specifying pre-wrap as there are browsers.
   *
   * CSS3/IE8: white-space: pre-wrap;
   * Mozilla:  white-space: -moz-pre-wrap;
   * Opera:    white-space: -o-pre-wrap;
   * IE6/7:    white-space: pre; word-wrap: break-word;
   *
   * @param {Element} el Element to enable pre-wrap for.
   */
  goog.style.setPreWrap = function(el) {
    var style = el.style;
    if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('8')) {
      style.whiteSpace = 'pre';
      style.wordWrap = 'break-word';
    } else if (goog.userAgent.GECKO) {
      style.whiteSpace = '-moz-pre-wrap';
    } else {
      style.whiteSpace = 'pre-wrap';
    }
  };
  
  
  /**
   * Sets 'display: inline-block' for an element (cross-browser).
   * @param {Element} el Element to which the inline-block display style is to be
   *    applied.
   * @see ../demos/inline_block_quirks.html
   * @see ../demos/inline_block_standards.html
   */
  goog.style.setInlineBlock = function(el) {
    var style = el.style;
    // Without position:relative, weirdness ensues.  Just accept it and move on.
    style.position = 'relative';
  
    if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('8')) {
      // IE8 supports inline-block so fall through to the else
      // Zoom:1 forces hasLayout, display:inline gives inline behavior.
      style.zoom = '1';
      style.display = 'inline';
    } else {
      // Opera, Webkit, and Safari seem to do OK with the standard inline-block
      // style.
      style.display = 'inline-block';
    }
  };
  
  
  /**
   * Returns true if the element is using right to left (rtl) direction.
   * @param {Element} el  The element to test.
   * @return {boolean} True for right to left, false for left to right.
   */
  goog.style.isRightToLeft = function(el) {
    return 'rtl' == goog.style.getStyle_(el, 'direction');
  };
  
  
  /**
   * The CSS style property corresponding to an element being
   * unselectable on the current browser platform (null if none).
   * Opera and IE instead use a DOM attribute 'unselectable'. MS Edge uses
   * the Webkit prefix.
   * @type {?string}
   * @private
   */
  goog.style.unselectableStyle_ = goog.userAgent.GECKO ?
      'MozUserSelect' :
      goog.userAgent.WEBKIT || goog.userAgent.EDGE ? 'WebkitUserSelect' : null;
  
  
  /**
   * Returns true if the element is set to be unselectable, false otherwise.
   * Note that on some platforms (e.g. Mozilla), even if an element isn't set
   * to be unselectable, it will behave as such if any of its ancestors is
   * unselectable.
   * @param {Element} el  Element to check.
   * @return {boolean}  Whether the element is set to be unselectable.
   */
  goog.style.isUnselectable = function(el) {
    if (goog.style.unselectableStyle_) {
      return el.style[goog.style.unselectableStyle_].toLowerCase() == 'none';
    } else if (goog.userAgent.IE || goog.userAgent.OPERA) {
      return el.getAttribute('unselectable') == 'on';
    }
    return false;
  };
  
  
  /**
   * Makes the element and its descendants selectable or unselectable.  Note
   * that on some platforms (e.g. Mozilla), even if an element isn't set to
   * be unselectable, it will behave as such if any of its ancestors is
   * unselectable.
   * @param {Element} el  The element to alter.
   * @param {boolean} unselectable  Whether the element and its descendants
   *     should be made unselectable.
   * @param {boolean=} opt_noRecurse  Whether to only alter the element's own
   *     selectable state, and leave its descendants alone; defaults to false.
   */
  goog.style.setUnselectable = function(el, unselectable, opt_noRecurse) {
    // TODO(attila): Do we need all of TR_DomUtil.makeUnselectable() in Closure?
    var descendants = !opt_noRecurse ? el.getElementsByTagName('*') : null;
    var name = goog.style.unselectableStyle_;
    if (name) {
      // Add/remove the appropriate CSS style to/from the element and its
      // descendants.
      var value = unselectable ? 'none' : '';
      // MathML elements do not have a style property. Verify before setting.
      if (el.style) {
        el.style[name] = value;
      }
      if (descendants) {
        for (var i = 0, descendant; descendant = descendants[i]; i++) {
          if (descendant.style) {
            descendant.style[name] = value;
          }
        }
      }
    } else if (goog.userAgent.IE || goog.userAgent.OPERA) {
      // Toggle the 'unselectable' attribute on the element and its descendants.
      var value = unselectable ? 'on' : '';
      el.setAttribute('unselectable', value);
      if (descendants) {
        for (var i = 0, descendant; descendant = descendants[i]; i++) {
          descendant.setAttribute('unselectable', value);
        }
      }
    }
  };
  
  
  /**
   * Gets the border box size for an element.
   * @param {Element} element  The element to get the size for.
   * @return {!goog.math.Size} The border box size.
   */
  goog.style.getBorderBoxSize = function(element) {
    return new goog.math.Size(
        /** @type {!HTMLElement} */ (element).offsetWidth,
        /** @type {!HTMLElement} */ (element).offsetHeight);
  };
  
  
  /**
   * Sets the border box size of an element. This is potentially expensive in IE
   * if the document is CSS1Compat mode
   * @param {Element} element  The element to set the size on.
   * @param {goog.math.Size} size  The new size.
   */
  goog.style.setBorderBoxSize = function(element, size) {
    var doc = goog.dom.getOwnerDocument(element);
    var isCss1CompatMode = goog.dom.getDomHelper(doc).isCss1CompatMode();
  
    if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('10') &&
        (!isCss1CompatMode || !goog.userAgent.isVersionOrHigher('8'))) {
      var style = element.style;
      if (isCss1CompatMode) {
        var paddingBox = goog.style.getPaddingBox(element);
        var borderBox = goog.style.getBorderBox(element);
        style.pixelWidth = size.width - borderBox.left - paddingBox.left -
            paddingBox.right - borderBox.right;
        style.pixelHeight = size.height - borderBox.top - paddingBox.top -
            paddingBox.bottom - borderBox.bottom;
      } else {
        style.pixelWidth = size.width;
        style.pixelHeight = size.height;
      }
    } else {
      goog.style.setBoxSizingSize_(element, size, 'border-box');
    }
  };
  
  
  /**
   * Gets the content box size for an element.  This is potentially expensive in
   * all browsers.
   * @param {Element} element  The element to get the size for.
   * @return {!goog.math.Size} The content box size.
   */
  goog.style.getContentBoxSize = function(element) {
    var doc = goog.dom.getOwnerDocument(element);
    var ieCurrentStyle = goog.userAgent.IE && element.currentStyle;
    if (ieCurrentStyle && goog.dom.getDomHelper(doc).isCss1CompatMode() &&
        ieCurrentStyle.width != 'auto' && ieCurrentStyle.height != 'auto' &&
        !ieCurrentStyle.boxSizing) {
      // If IE in CSS1Compat mode than just use the width and height.
      // If we have a boxSizing then fall back on measuring the borders etc.
      var width = goog.style.getIePixelValue_(
          element, /** @type {string} */ (ieCurrentStyle.width), 'width',
          'pixelWidth');
      var height = goog.style.getIePixelValue_(
          element, /** @type {string} */ (ieCurrentStyle.height), 'height',
          'pixelHeight');
      return new goog.math.Size(width, height);
    } else {
      var borderBoxSize = goog.style.getBorderBoxSize(element);
      var paddingBox = goog.style.getPaddingBox(element);
      var borderBox = goog.style.getBorderBox(element);
      return new goog.math.Size(
          borderBoxSize.width - borderBox.left - paddingBox.left -
              paddingBox.right - borderBox.right,
          borderBoxSize.height - borderBox.top - paddingBox.top -
              paddingBox.bottom - borderBox.bottom);
    }
  };
  
  
  /**
   * Sets the content box size of an element. This is potentially expensive in IE
   * if the document is BackCompat mode.
   * @param {Element} element  The element to set the size on.
   * @param {goog.math.Size} size  The new size.
   */
  goog.style.setContentBoxSize = function(element, size) {
    var doc = goog.dom.getOwnerDocument(element);
    var isCss1CompatMode = goog.dom.getDomHelper(doc).isCss1CompatMode();
    if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('10') &&
        (!isCss1CompatMode || !goog.userAgent.isVersionOrHigher('8'))) {
      var style = element.style;
      if (isCss1CompatMode) {
        style.pixelWidth = size.width;
        style.pixelHeight = size.height;
      } else {
        var paddingBox = goog.style.getPaddingBox(element);
        var borderBox = goog.style.getBorderBox(element);
        style.pixelWidth = size.width + borderBox.left + paddingBox.left +
            paddingBox.right + borderBox.right;
        style.pixelHeight = size.height + borderBox.top + paddingBox.top +
            paddingBox.bottom + borderBox.bottom;
      }
    } else {
      goog.style.setBoxSizingSize_(element, size, 'content-box');
    }
  };
  
  
  /**
   * Helper function that sets the box sizing as well as the width and height
   * @param {Element} element  The element to set the size on.
   * @param {goog.math.Size} size  The new size to set.
   * @param {string} boxSizing  The box-sizing value.
   * @private
   */
  goog.style.setBoxSizingSize_ = function(element, size, boxSizing) {
    var style = element.style;
    if (goog.userAgent.GECKO) {
      style.MozBoxSizing = boxSizing;
    } else if (goog.userAgent.WEBKIT) {
      style.WebkitBoxSizing = boxSizing;
    } else {
      // Includes IE8 and Opera 9.50+
      style.boxSizing = boxSizing;
    }
  
    // Setting this to a negative value will throw an exception on IE
    // (and doesn't do anything different than setting it to 0).
    style.width = Math.max(size.width, 0) + 'px';
    style.height = Math.max(size.height, 0) + 'px';
  };
  
  
  /**
   * IE specific function that converts a non pixel unit to pixels.
   * @param {Element} element  The element to convert the value for.
   * @param {string} value  The current value as a string. The value must not be
   *     ''.
   * @param {string} name  The CSS property name to use for the converstion. This
   *     should be 'left', 'top', 'width' or 'height'.
   * @param {string} pixelName  The CSS pixel property name to use to get the
   *     value in pixels.
   * @return {number} The value in pixels.
   * @private
   */
  goog.style.getIePixelValue_ = function(element, value, name, pixelName) {
    // Try if we already have a pixel value. IE does not do half pixels so we
    // only check if it matches a number followed by 'px'.
    if (/^\d+px?$/.test(value)) {
      return parseInt(value, 10);
    } else {
      var oldStyleValue = element.style[name];
      var oldRuntimeValue = element.runtimeStyle[name];
      // set runtime style to prevent changes
      element.runtimeStyle[name] = element.currentStyle[name];
      element.style[name] = value;
      var pixelValue = element.style[pixelName];
      // restore
      element.style[name] = oldStyleValue;
      element.runtimeStyle[name] = oldRuntimeValue;
      return +pixelValue;
    }
  };
  
  
  /**
   * Helper function for getting the pixel padding or margin for IE.
   * @param {Element} element  The element to get the padding for.
   * @param {string} propName  The property name.
   * @return {number} The pixel padding.
   * @private
   */
  goog.style.getIePixelDistance_ = function(element, propName) {
    var value = goog.style.getCascadedStyle(element, propName);
    return value ?
        goog.style.getIePixelValue_(element, value, 'left', 'pixelLeft') :
        0;
  };
  
  
  /**
   * Gets the computed paddings or margins (on all sides) in pixels.
   * @param {Element} element  The element to get the padding for.
   * @param {string} stylePrefix  Pass 'padding' to retrieve the padding box,
   *     or 'margin' to retrieve the margin box.
   * @return {!goog.math.Box} The computed paddings or margins.
   * @private
   */
  goog.style.getBox_ = function(element, stylePrefix) {
    if (goog.userAgent.IE) {
      var left = goog.style.getIePixelDistance_(element, stylePrefix + 'Left');
      var right = goog.style.getIePixelDistance_(element, stylePrefix + 'Right');
      var top = goog.style.getIePixelDistance_(element, stylePrefix + 'Top');
      var bottom =
          goog.style.getIePixelDistance_(element, stylePrefix + 'Bottom');
      return new goog.math.Box(top, right, bottom, left);
    } else {
      // On non-IE browsers, getComputedStyle is always non-null.
      var left = goog.style.getComputedStyle(element, stylePrefix + 'Left');
      var right = goog.style.getComputedStyle(element, stylePrefix + 'Right');
      var top = goog.style.getComputedStyle(element, stylePrefix + 'Top');
      var bottom = goog.style.getComputedStyle(element, stylePrefix + 'Bottom');
  
      // NOTE(arv): Gecko can return floating point numbers for the computed
      // style values.
      return new goog.math.Box(
          parseFloat(top), parseFloat(right), parseFloat(bottom),
          parseFloat(left));
    }
  };
  
  
  /**
   * Gets the computed paddings (on all sides) in pixels.
   * @param {Element} element  The element to get the padding for.
   * @return {!goog.math.Box} The computed paddings.
   */
  goog.style.getPaddingBox = function(element) {
    return goog.style.getBox_(element, 'padding');
  };
  
  
  /**
   * Gets the computed margins (on all sides) in pixels.
   * @param {Element} element  The element to get the margins for.
   * @return {!goog.math.Box} The computed margins.
   */
  goog.style.getMarginBox = function(element) {
    return goog.style.getBox_(element, 'margin');
  };
  
  
  /**
   * A map used to map the border width keywords to a pixel width.
   * @type {!Object}
   * @private
   */
  goog.style.ieBorderWidthKeywords_ = {
    'thin': 2,
    'medium': 4,
    'thick': 6
  };
  
  
  /**
   * Helper function for IE to get the pixel border.
   * @param {Element} element  The element to get the pixel border for.
   * @param {string} prop  The part of the property name.
   * @return {number} The value in pixels.
   * @private
   */
  goog.style.getIePixelBorder_ = function(element, prop) {
    if (goog.style.getCascadedStyle(element, prop + 'Style') == 'none') {
      return 0;
    }
    var width = goog.style.getCascadedStyle(element, prop + 'Width');
    if (width in goog.style.ieBorderWidthKeywords_) {
      return goog.style.ieBorderWidthKeywords_[width];
    }
    return goog.style.getIePixelValue_(element, width, 'left', 'pixelLeft');
  };
  
  
  /**
   * Gets the computed border widths (on all sides) in pixels
   * @param {Element} element  The element to get the border widths for.
   * @return {!goog.math.Box} The computed border widths.
   */
  goog.style.getBorderBox = function(element) {
    if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9)) {
      var left = goog.style.getIePixelBorder_(element, 'borderLeft');
      var right = goog.style.getIePixelBorder_(element, 'borderRight');
      var top = goog.style.getIePixelBorder_(element, 'borderTop');
      var bottom = goog.style.getIePixelBorder_(element, 'borderBottom');
      return new goog.math.Box(top, right, bottom, left);
    } else {
      // On non-IE browsers, getComputedStyle is always non-null.
      var left = goog.style.getComputedStyle(element, 'borderLeftWidth');
      var right = goog.style.getComputedStyle(element, 'borderRightWidth');
      var top = goog.style.getComputedStyle(element, 'borderTopWidth');
      var bottom = goog.style.getComputedStyle(element, 'borderBottomWidth');
  
      return new goog.math.Box(
          parseFloat(top), parseFloat(right), parseFloat(bottom),
          parseFloat(left));
    }
  };
  
  
  /**
   * Returns the font face applied to a given node. Opera and IE should return
   * the font actually displayed. Firefox returns the author's most-preferred
   * font (whether the browser is capable of displaying it or not.)
   * @param {Element} el  The element whose font family is returned.
   * @return {string} The font family applied to el.
   */
  goog.style.getFontFamily = function(el) {
    var doc = goog.dom.getOwnerDocument(el);
    var font = '';
    // The moveToElementText method from the TextRange only works if the element
    // is attached to the owner document.
    if (doc.body.createTextRange && goog.dom.contains(doc, el)) {
      var range = doc.body.createTextRange();
      range.moveToElementText(el);
  
      try {
        font = range.queryCommandValue('FontName');
      } catch (e) {
        // This is a workaround for a awkward exception.
        // On some IE, there is an exception coming from it.
        // The error description from this exception is:
        // This window has already been registered as a drop target
        // This is bogus description, likely due to a bug in ie.
        font = '';
      }
    }
    if (!font) {
      // Note if for some reason IE can't derive FontName with a TextRange, we
      // fallback to using currentStyle
      font = goog.style.getStyle_(el, 'fontFamily');
    }
  
    // Firefox returns the applied font-family string (author's list of
    // preferred fonts.) We want to return the most-preferred font, in lieu of
    // the *actually* applied font.
    var fontsArray = font.split(',');
    if (fontsArray.length > 1) font = fontsArray[0];
  
    // Sanitize for x-browser consistency:
    // Strip quotes because browsers aren't consistent with how they're
    // applied; Opera always encloses, Firefox sometimes, and IE never.
    return goog.string.stripQuotes(font, '"\'');
  };
  
  
  /**
   * Regular expression used for getLengthUnits.
   * @type {RegExp}
   * @private
   */
  goog.style.lengthUnitRegex_ = /[^\d]+$/;
  
  
  /**
   * Returns the units used for a CSS length measurement.
   * @param {string} value  A CSS length quantity.
   * @return {?string} The units of measurement.
   */
  goog.style.getLengthUnits = function(value) {
    var units = value.match(goog.style.lengthUnitRegex_);
    return units && units[0] || null;
  };
  
  
  /**
   * Map of absolute CSS length units
   * @type {!Object}
   * @private
   */
  goog.style.ABSOLUTE_CSS_LENGTH_UNITS_ = {
    'cm': 1,
    'in': 1,
    'mm': 1,
    'pc': 1,
    'pt': 1
  };
  
  
  /**
   * Map of relative CSS length units that can be accurately converted to px
   * font-size values using getIePixelValue_. Only units that are defined in
   * relation to a font size are convertible (%, small, etc. are not).
   * @type {!Object}
   * @private
   */
  goog.style.CONVERTIBLE_RELATIVE_CSS_UNITS_ = {
    'em': 1,
    'ex': 1
  };
  
  
  /**
   * Returns the font size, in pixels, of text in an element.
   * @param {Element} el  The element whose font size is returned.
   * @return {number} The font size (in pixels).
   */
  goog.style.getFontSize = function(el) {
    var fontSize = goog.style.getStyle_(el, 'fontSize');
    var sizeUnits = goog.style.getLengthUnits(fontSize);
    if (fontSize && 'px' == sizeUnits) {
      // NOTE(user): This could be parseFloat instead, but IE doesn't return
      // decimal fractions in getStyle_ and Firefox reports the fractions, but
      // ignores them when rendering. Interestingly enough, when we force the
      // issue and size something to e.g., 50% of 25px, the browsers round in
      // opposite directions with Firefox reporting 12px and IE 13px. I punt.
      return parseInt(fontSize, 10);
    }
  
    // In IE, we can convert absolute length units to a px value using
    // goog.style.getIePixelValue_. Units defined in relation to a font size
    // (em, ex) are applied relative to the element's parentNode and can also
    // be converted.
    if (goog.userAgent.IE) {
      if (String(sizeUnits) in goog.style.ABSOLUTE_CSS_LENGTH_UNITS_) {
        return goog.style.getIePixelValue_(el, fontSize, 'left', 'pixelLeft');
      } else if (
          el.parentNode && el.parentNode.nodeType == goog.dom.NodeType.ELEMENT &&
          String(sizeUnits) in goog.style.CONVERTIBLE_RELATIVE_CSS_UNITS_) {
        // Check the parent size - if it is the same it means the relative size
        // value is inherited and we therefore don't want to count it twice.  If
        // it is different, this element either has explicit style or has a CSS
        // rule applying to it.
        var parentElement = /** @type {!Element} */ (el.parentNode);
        var parentSize = goog.style.getStyle_(parentElement, 'fontSize');
        return goog.style.getIePixelValue_(
            parentElement, fontSize == parentSize ? '1em' : fontSize, 'left',
            'pixelLeft');
      }
    }
  
    // Sometimes we can't cleanly find the font size (some units relative to a
    // node's parent's font size are difficult: %, smaller et al), so we create
    // an invisible, absolutely-positioned span sized to be the height of an 'M'
    // rendered in its parent's (i.e., our target element's) font size. This is
    // the definition of CSS's font size attribute.
    var sizeElement = goog.dom.createDom(goog.dom.TagName.SPAN, {
      'style': 'visibility:hidden;position:absolute;' +
          'line-height:0;padding:0;margin:0;border:0;height:1em;'
    });
    goog.dom.appendChild(el, sizeElement);
    fontSize = sizeElement.offsetHeight;
    goog.dom.removeNode(sizeElement);
  
    return fontSize;
  };
  
  
  /**
   * Parses a style attribute value.  Converts CSS property names to camel case.
   * @param {string} value The style attribute value.
   * @return {!Object} Map of CSS properties to string values.
   */
  goog.style.parseStyleAttribute = function(value) {
    var result = {};
    goog.array.forEach(value.split(/\s*;\s*/), function(pair) {
      var keyValue = pair.match(/\s*([\w-]+)\s*\:(.+)/);
      if (keyValue) {
        var styleName = keyValue[1];
        var styleValue = goog.string.trim(keyValue[2]);
        result[goog.string.toCamelCase(styleName.toLowerCase())] = styleValue;
      }
    });
    return result;
  };
  
  
  /**
   * Reverse of parseStyleAttribute; that is, takes a style object and returns the
   * corresponding attribute value.  Converts camel case property names to proper
   * CSS selector names.
   * @param {Object} obj Map of CSS properties to values.
   * @return {string} The style attribute value.
   */
  goog.style.toStyleAttribute = function(obj) {
    var buffer = [];
    goog.object.forEach(obj, function(value, key) {
      buffer.push(goog.string.toSelectorCase(key), ':', value, ';');
    });
    return buffer.join('');
  };
  
  
  /**
   * Sets CSS float property on an element.
   * @param {Element} el The element to set float property on.
   * @param {string} value The value of float CSS property to set on this element.
   */
  goog.style.setFloat = function(el, value) {
    el.style[goog.userAgent.IE ? 'styleFloat' : 'cssFloat'] = value;
  };
  
  
  /**
   * Gets value of explicitly-set float CSS property on an element.
   * @param {Element} el The element to get float property of.
   * @return {string} The value of explicitly-set float CSS property on this
   *     element.
   */
  goog.style.getFloat = function(el) {
    return el.style[goog.userAgent.IE ? 'styleFloat' : 'cssFloat'] || '';
  };
  
  
  /**
   * Returns the scroll bar width (represents the width of both horizontal
   * and vertical scroll).
   *
   * @param {string=} opt_className An optional class name (or names) to apply
   *     to the invisible div created to measure the scrollbar. This is necessary
   *     if some scrollbars are styled differently than others.
   * @return {number} The scroll bar width in px.
   */
  goog.style.getScrollbarWidth = function(opt_className) {
    // Add two hidden divs.  The child div is larger than the parent and
    // forces scrollbars to appear on it.
    // Using overflow:scroll does not work consistently with scrollbars that
    // are styled with ::-webkit-scrollbar.
    var outerDiv = goog.dom.createElement(goog.dom.TagName.DIV);
    if (opt_className) {
      outerDiv.className = opt_className;
    }
    outerDiv.style.cssText = 'overflow:auto;' +
        'position:absolute;top:0;width:100px;height:100px';
    var innerDiv = goog.dom.createElement(goog.dom.TagName.DIV);
    goog.style.setSize(innerDiv, '200px', '200px');
    outerDiv.appendChild(innerDiv);
    goog.dom.appendChild(goog.dom.getDocument().body, outerDiv);
    var width = outerDiv.offsetWidth - outerDiv.clientWidth;
    goog.dom.removeNode(outerDiv);
    return width;
  };
  
  
  /**
   * Regular expression to extract x and y translation components from a CSS
   * transform Matrix representation.
   *
   * @type {!RegExp}
   * @const
   * @private
   */
  goog.style.MATRIX_TRANSLATION_REGEX_ = new RegExp(
      'matrix\\([0-9\\.\\-]+, [0-9\\.\\-]+, ' +
      '[0-9\\.\\-]+, [0-9\\.\\-]+, ' +
      '([0-9\\.\\-]+)p?x?, ([0-9\\.\\-]+)p?x?\\)');
  
  
  /**
   * Returns the x,y translation component of any CSS transforms applied to the
   * element, in pixels.
   *
   * @param {!Element} element The element to get the translation of.
   * @return {!goog.math.Coordinate} The CSS translation of the element in px.
   */
  goog.style.getCssTranslation = function(element) {
    var transform = goog.style.getComputedTransform(element);
    if (!transform) {
      return new goog.math.Coordinate(0, 0);
    }
    var matches = transform.match(goog.style.MATRIX_TRANSLATION_REGEX_);
    if (!matches) {
      return new goog.math.Coordinate(0, 0);
    }
    return new goog.math.Coordinate(
        parseFloat(matches[1]), parseFloat(matches[2]));
  };
  