move src out of srv, clean up default.nix and Makefile

1 files changed, 0 insertions, 2992 deletions

diff --git a/srv/src/http/static/viz/1/goog/dom/dom.js b/srv/src/http/static/viz/1/goog/dom/dom.js
deleted file mode 100644
index 4d3cdf9..0000000
--- a/srv/src/http/static/viz/1/goog/dom/dom.js
+++ /dev/null
@@ -1,2992 +0,0 @@
-// 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 manipulating the browser's Document Object Model
- * Inspiration taken *heavily* from mochikit (http://mochikit.com/).
- *
- * You can use {@link goog.dom.DomHelper} to create new dom helpers that refer
- * to a different document object.  This is useful if you are working with
- * frames or multiple windows.
- *
- * @author arv@google.com (Erik Arvidsson)
- */
-
-
-// TODO(arv): Rename/refactor getTextContent and getRawTextContent. The problem
-// is that getTextContent should mimic the DOM3 textContent. We should add a
-// getInnerText (or getText) which tries to return the visible text, innerText.
-
-
-goog.provide('goog.dom');
-goog.provide('goog.dom.Appendable');
-goog.provide('goog.dom.DomHelper');
-
-goog.require('goog.array');
-goog.require('goog.asserts');
-goog.require('goog.dom.BrowserFeature');
-goog.require('goog.dom.NodeType');
-goog.require('goog.dom.TagName');
-goog.require('goog.dom.safe');
-goog.require('goog.html.SafeHtml');
-goog.require('goog.html.uncheckedconversions');
-goog.require('goog.math.Coordinate');
-goog.require('goog.math.Size');
-goog.require('goog.object');
-goog.require('goog.string');
-goog.require('goog.string.Unicode');
-goog.require('goog.userAgent');
-
-
-/**
- * @define {boolean} Whether we know at compile time that the browser is in
- * quirks mode.
- */
-goog.define('goog.dom.ASSUME_QUIRKS_MODE', false);
-
-
-/**
- * @define {boolean} Whether we know at compile time that the browser is in
- * standards compliance mode.
- */
-goog.define('goog.dom.ASSUME_STANDARDS_MODE', false);
-
-
-/**
- * Whether we know the compatibility mode at compile time.
- * @type {boolean}
- * @private
- */
-goog.dom.COMPAT_MODE_KNOWN_ =
-    goog.dom.ASSUME_QUIRKS_MODE || goog.dom.ASSUME_STANDARDS_MODE;
-
-
-/**
- * Gets the DomHelper object for the document where the element resides.
- * @param {(Node|Window)=} opt_element If present, gets the DomHelper for this
- *     element.
- * @return {!goog.dom.DomHelper} The DomHelper.
- */
-goog.dom.getDomHelper = function(opt_element) {
-  return opt_element ?
-      new goog.dom.DomHelper(goog.dom.getOwnerDocument(opt_element)) :
-      (goog.dom.defaultDomHelper_ ||
-       (goog.dom.defaultDomHelper_ = new goog.dom.DomHelper()));
-};
-
-
-/**
- * Cached default DOM helper.
- * @type {!goog.dom.DomHelper|undefined}
- * @private
- */
-goog.dom.defaultDomHelper_;
-
-
-/**
- * Gets the document object being used by the dom library.
- * @return {!Document} Document object.
- */
-goog.dom.getDocument = function() {
-  return document;
-};
-
-
-/**
- * Gets an element from the current document by element id.
- *
- * If an Element is passed in, it is returned.
- *
- * @param {string|Element} element Element ID or a DOM node.
- * @return {Element} The element with the given ID, or the node passed in.
- */
-goog.dom.getElement = function(element) {
-  return goog.dom.getElementHelper_(document, element);
-};
-
-
-/**
- * Gets an element by id from the given document (if present).
- * If an element is given, it is returned.
- * @param {!Document} doc
- * @param {string|Element} element Element ID or a DOM node.
- * @return {Element} The resulting element.
- * @private
- */
-goog.dom.getElementHelper_ = function(doc, element) {
-  return goog.isString(element) ? doc.getElementById(element) : element;
-};
-
-
-/**
- * Gets an element by id, asserting that the element is found.
- *
- * This is used when an element is expected to exist, and should fail with
- * an assertion error if it does not (if assertions are enabled).
- *
- * @param {string} id Element ID.
- * @return {!Element} The element with the given ID, if it exists.
- */
-goog.dom.getRequiredElement = function(id) {
-  return goog.dom.getRequiredElementHelper_(document, id);
-};
-
-
-/**
- * Helper function for getRequiredElementHelper functions, both static and
- * on DomHelper.  Asserts the element with the given id exists.
- * @param {!Document} doc
- * @param {string} id
- * @return {!Element} The element with the given ID, if it exists.
- * @private
- */
-goog.dom.getRequiredElementHelper_ = function(doc, id) {
-  // To prevent users passing in Elements as is permitted in getElement().
-  goog.asserts.assertString(id);
-  var element = goog.dom.getElementHelper_(doc, id);
-  element =
-      goog.asserts.assertElement(element, 'No element found with id: ' + id);
-  return element;
-};
-
-
-/**
- * Alias for getElement.
- * @param {string|Element} element Element ID or a DOM node.
- * @return {Element} The element with the given ID, or the node passed in.
- * @deprecated Use {@link goog.dom.getElement} instead.
- */
-goog.dom.$ = goog.dom.getElement;
-
-
-/**
- * Looks up elements by both tag and class name, using browser native functions
- * ({@code querySelectorAll}, {@code getElementsByTagName} or
- * {@code getElementsByClassName}) where possible. This function
- * is a useful, if limited, way of collecting a list of DOM elements
- * with certain characteristics.  {@code goog.dom.query} offers a
- * more powerful and general solution which allows matching on CSS3
- * selector expressions, but at increased cost in code size. If all you
- * need is particular tags belonging to a single class, this function
- * is fast and sleek.
- *
- * Note that tag names are case sensitive in the SVG namespace, and this
- * function converts opt_tag to uppercase for comparisons. For queries in the
- * SVG namespace you should use querySelector or querySelectorAll instead.
- * https://bugzilla.mozilla.org/show_bug.cgi?id=963870
- * https://bugs.webkit.org/show_bug.cgi?id=83438
- *
- * @see {goog.dom.query}
- *
- * @param {?string=} opt_tag Element tag name.
- * @param {?string=} opt_class Optional class name.
- * @param {(Document|Element)=} opt_el Optional element to look in.
- * @return {!IArrayLike<!Element>} Array-like list of elements (only a length
- *     property and numerical indices are guaranteed to exist).
- */
-goog.dom.getElementsByTagNameAndClass = function(opt_tag, opt_class, opt_el) {
-  return goog.dom.getElementsByTagNameAndClass_(
-      document, opt_tag, opt_class, opt_el);
-};
-
-
-/**
- * Returns a static, array-like list of the elements with the provided
- * className.
- * @see {goog.dom.query}
- * @param {string} className the name of the class to look for.
- * @param {(Document|Element)=} opt_el Optional element to look in.
- * @return {!IArrayLike<!Element>} The items found with the class name provided.
- */
-goog.dom.getElementsByClass = function(className, opt_el) {
-  var parent = opt_el || document;
-  if (goog.dom.canUseQuerySelector_(parent)) {
-    return parent.querySelectorAll('.' + className);
-  }
-  return goog.dom.getElementsByTagNameAndClass_(
-      document, '*', className, opt_el);
-};
-
-
-/**
- * Returns the first element with the provided className.
- * @see {goog.dom.query}
- * @param {string} className the name of the class to look for.
- * @param {Element|Document=} opt_el Optional element to look in.
- * @return {Element} The first item with the class name provided.
- */
-goog.dom.getElementByClass = function(className, opt_el) {
-  var parent = opt_el || document;
-  var retVal = null;
-  if (parent.getElementsByClassName) {
-    retVal = parent.getElementsByClassName(className)[0];
-  } else if (goog.dom.canUseQuerySelector_(parent)) {
-    retVal = parent.querySelector('.' + className);
-  } else {
-    retVal = goog.dom.getElementsByTagNameAndClass_(
-        document, '*', className, opt_el)[0];
-  }
-  return retVal || null;
-};
-
-
-/**
- * Ensures an element with the given className exists, and then returns the
- * first element with the provided className.
- * @see {goog.dom.query}
- * @param {string} className the name of the class to look for.
- * @param {!Element|!Document=} opt_root Optional element or document to look
- *     in.
- * @return {!Element} The first item with the class name provided.
- * @throws {goog.asserts.AssertionError} Thrown if no element is found.
- */
-goog.dom.getRequiredElementByClass = function(className, opt_root) {
-  var retValue = goog.dom.getElementByClass(className, opt_root);
-  return goog.asserts.assert(
-      retValue, 'No element found with className: ' + className);
-};
-
-
-/**
- * Prefer the standardized (http://www.w3.org/TR/selectors-api/), native and
- * fast W3C Selectors API.
- * @param {!(Element|Document)} parent The parent document object.
- * @return {boolean} whether or not we can use parent.querySelector* APIs.
- * @private
- */
-goog.dom.canUseQuerySelector_ = function(parent) {
-  return !!(parent.querySelectorAll && parent.querySelector);
-};
-
-
-/**
- * Helper for {@code getElementsByTagNameAndClass}.
- * @param {!Document} doc The document to get the elements in.
- * @param {?string=} opt_tag Element tag name.
- * @param {?string=} opt_class Optional class name.
- * @param {(Document|Element)=} opt_el Optional element to look in.
- * @return {!IArrayLike<!Element>} Array-like list of elements (only a length
- *     property and numerical indices are guaranteed to exist).
- * @private
- */
-goog.dom.getElementsByTagNameAndClass_ = function(
-    doc, opt_tag, opt_class, opt_el) {
-  var parent = opt_el || doc;
-  var tagName = (opt_tag && opt_tag != '*') ? opt_tag.toUpperCase() : '';
-
-  if (goog.dom.canUseQuerySelector_(parent) && (tagName || opt_class)) {
-    var query = tagName + (opt_class ? '.' + opt_class : '');
-    return parent.querySelectorAll(query);
-  }
-
-  // Use the native getElementsByClassName if available, under the assumption
-  // that even when the tag name is specified, there will be fewer elements to
-  // filter through when going by class than by tag name
-  if (opt_class && parent.getElementsByClassName) {
-    var els = parent.getElementsByClassName(opt_class);
-
-    if (tagName) {
-      var arrayLike = {};
-      var len = 0;
-
-      // Filter for specific tags if requested.
-      for (var i = 0, el; el = els[i]; i++) {
-        if (tagName == el.nodeName) {
-          arrayLike[len++] = el;
-        }
-      }
-      arrayLike.length = len;
-
-      return /** @type {!IArrayLike<!Element>} */ (arrayLike);
-    } else {
-      return els;
-    }
-  }
-
-  var els = parent.getElementsByTagName(tagName || '*');
-
-  if (opt_class) {
-    var arrayLike = {};
-    var len = 0;
-    for (var i = 0, el; el = els[i]; i++) {
-      var className = el.className;
-      // Check if className has a split function since SVG className does not.
-      if (typeof className.split == 'function' &&
-          goog.array.contains(className.split(/\s+/), opt_class)) {
-        arrayLike[len++] = el;
-      }
-    }
-    arrayLike.length = len;
-    return /** @type {!IArrayLike<!Element>} */ (arrayLike);
-  } else {
-    return els;
-  }
-};
-
-
-/**
- * Alias for {@code getElementsByTagNameAndClass}.
- * @param {?string=} opt_tag Element tag name.
- * @param {?string=} opt_class Optional class name.
- * @param {Element=} opt_el Optional element to look in.
- * @return {!IArrayLike<!Element>} Array-like list of elements (only a length
- *     property and numerical indices are guaranteed to exist).
- * @deprecated Use {@link goog.dom.getElementsByTagNameAndClass} instead.
- */
-goog.dom.$$ = goog.dom.getElementsByTagNameAndClass;
-
-
-/**
- * Sets multiple properties on a node.
- * @param {Element} element DOM node to set properties on.
- * @param {Object} properties Hash of property:value pairs.
- */
-goog.dom.setProperties = function(element, properties) {
-  goog.object.forEach(properties, function(val, key) {
-    if (key == 'style') {
-      element.style.cssText = val;
-    } else if (key == 'class') {
-      element.className = val;
-    } else if (key == 'for') {
-      element.htmlFor = val;
-    } else if (goog.dom.DIRECT_ATTRIBUTE_MAP_.hasOwnProperty(key)) {
-      element.setAttribute(goog.dom.DIRECT_ATTRIBUTE_MAP_[key], val);
-    } else if (
-        goog.string.startsWith(key, 'aria-') ||
-        goog.string.startsWith(key, 'data-')) {
-      element.setAttribute(key, val);
-    } else {
-      element[key] = val;
-    }
-  });
-};
-
-
-/**
- * Map of attributes that should be set using
- * element.setAttribute(key, val) instead of element[key] = val.  Used
- * by goog.dom.setProperties.
- *
- * @private {!Object<string, string>}
- * @const
- */
-goog.dom.DIRECT_ATTRIBUTE_MAP_ = {
-  'cellpadding': 'cellPadding',
-  'cellspacing': 'cellSpacing',
-  'colspan': 'colSpan',
-  'frameborder': 'frameBorder',
-  'height': 'height',
-  'maxlength': 'maxLength',
-  'nonce': 'nonce',
-  'role': 'role',
-  'rowspan': 'rowSpan',
-  'type': 'type',
-  'usemap': 'useMap',
-  'valign': 'vAlign',
-  'width': 'width'
-};
-
-
-/**
- * Gets the dimensions of the viewport.
- *
- * Gecko Standards mode:
- * docEl.clientWidth  Width of viewport excluding scrollbar.
- * win.innerWidth     Width of viewport including scrollbar.
- * body.clientWidth   Width of body element.
- *
- * docEl.clientHeight Height of viewport excluding scrollbar.
- * win.innerHeight    Height of viewport including scrollbar.
- * body.clientHeight  Height of document.
- *
- * Gecko Backwards compatible mode:
- * docEl.clientWidth  Width of viewport excluding scrollbar.
- * win.innerWidth     Width of viewport including scrollbar.
- * body.clientWidth   Width of viewport excluding scrollbar.
- *
- * docEl.clientHeight Height of document.
- * win.innerHeight    Height of viewport including scrollbar.
- * body.clientHeight  Height of viewport excluding scrollbar.
- *
- * IE6/7 Standards mode:
- * docEl.clientWidth  Width of viewport excluding scrollbar.
- * win.innerWidth     Undefined.
- * body.clientWidth   Width of body element.
- *
- * docEl.clientHeight Height of viewport excluding scrollbar.
- * win.innerHeight    Undefined.
- * body.clientHeight  Height of document element.
- *
- * IE5 + IE6/7 Backwards compatible mode:
- * docEl.clientWidth  0.
- * win.innerWidth     Undefined.
- * body.clientWidth   Width of viewport excluding scrollbar.
- *
- * docEl.clientHeight 0.
- * win.innerHeight    Undefined.
- * body.clientHeight  Height of viewport excluding scrollbar.
- *
- * Opera 9 Standards and backwards compatible mode:
- * docEl.clientWidth  Width of viewport excluding scrollbar.
- * win.innerWidth     Width of viewport including scrollbar.
- * body.clientWidth   Width of viewport excluding scrollbar.
- *
- * docEl.clientHeight Height of document.
- * win.innerHeight    Height of viewport including scrollbar.
- * body.clientHeight  Height of viewport excluding scrollbar.
- *
- * WebKit:
- * Safari 2
- * docEl.clientHeight Same as scrollHeight.
- * docEl.clientWidth  Same as innerWidth.
- * win.innerWidth     Width of viewport excluding scrollbar.
- * win.innerHeight    Height of the viewport including scrollbar.
- * frame.innerHeight  Height of the viewport exluding scrollbar.
- *
- * Safari 3 (tested in 522)
- *
- * docEl.clientWidth  Width of viewport excluding scrollbar.
- * docEl.clientHeight Height of viewport excluding scrollbar in strict mode.
- * body.clientHeight  Height of viewport excluding scrollbar in quirks mode.
- *
- * @param {Window=} opt_window Optional window element to test.
- * @return {!goog.math.Size} Object with values 'width' and 'height'.
- */
-goog.dom.getViewportSize = function(opt_window) {
-  // TODO(arv): This should not take an argument
-  return goog.dom.getViewportSize_(opt_window || window);
-};
-
-
-/**
- * Helper for {@code getViewportSize}.
- * @param {Window} win The window to get the view port size for.
- * @return {!goog.math.Size} Object with values 'width' and 'height'.
- * @private
- */
-goog.dom.getViewportSize_ = function(win) {
-  var doc = win.document;
-  var el = goog.dom.isCss1CompatMode_(doc) ? doc.documentElement : doc.body;
-  return new goog.math.Size(el.clientWidth, el.clientHeight);
-};
-
-
-/**
- * Calculates the height of the document.
- *
- * @return {number} The height of the current document.
- */
-goog.dom.getDocumentHeight = function() {
-  return goog.dom.getDocumentHeight_(window);
-};
-
-/**
- * Calculates the height of the document of the given window.
- *
- * @param {!Window} win The window whose document height to retrieve.
- * @return {number} The height of the document of the given window.
- */
-goog.dom.getDocumentHeightForWindow = function(win) {
-  return goog.dom.getDocumentHeight_(win);
-};
-
-/**
- * Calculates the height of the document of the given window.
- *
- * Function code copied from the opensocial gadget api:
- *   gadgets.window.adjustHeight(opt_height)
- *
- * @private
- * @param {!Window} win The window whose document height to retrieve.
- * @return {number} The height of the document of the given window.
- */
-goog.dom.getDocumentHeight_ = function(win) {
-  // NOTE(eae): This method will return the window size rather than the document
-  // size in webkit quirks mode.
-  var doc = win.document;
-  var height = 0;
-
-  if (doc) {
-    // Calculating inner content height is hard and different between
-    // browsers rendering in Strict vs. Quirks mode.  We use a combination of
-    // three properties within document.body and document.documentElement:
-    // - scrollHeight
-    // - offsetHeight
-    // - clientHeight
-    // These values differ significantly between browsers and rendering modes.
-    // But there are patterns.  It just takes a lot of time and persistence
-    // to figure out.
-
-    var body = doc.body;
-    var docEl = /** @type {!HTMLElement} */ (doc.documentElement);
-    if (!(docEl && body)) {
-      return 0;
-    }
-
-    // Get the height of the viewport
-    var vh = goog.dom.getViewportSize_(win).height;
-    if (goog.dom.isCss1CompatMode_(doc) && docEl.scrollHeight) {
-      // In Strict mode:
-      // The inner content height is contained in either:
-      //    document.documentElement.scrollHeight
-      //    document.documentElement.offsetHeight
-      // Based on studying the values output by different browsers,
-      // use the value that's NOT equal to the viewport height found above.
-      height =
-          docEl.scrollHeight != vh ? docEl.scrollHeight : docEl.offsetHeight;
-    } else {
-      // In Quirks mode:
-      // documentElement.clientHeight is equal to documentElement.offsetHeight
-      // except in IE.  In most browsers, document.documentElement can be used
-      // to calculate the inner content height.
-      // However, in other browsers (e.g. IE), document.body must be used
-      // instead.  How do we know which one to use?
-      // If document.documentElement.clientHeight does NOT equal
-      // document.documentElement.offsetHeight, then use document.body.
-      var sh = docEl.scrollHeight;
-      var oh = docEl.offsetHeight;
-      if (docEl.clientHeight != oh) {
-        sh = body.scrollHeight;
-        oh = body.offsetHeight;
-      }
-
-      // Detect whether the inner content height is bigger or smaller
-      // than the bounding box (viewport).  If bigger, take the larger
-      // value.  If smaller, take the smaller value.
-      if (sh > vh) {
-        // Content is larger
-        height = sh > oh ? sh : oh;
-      } else {
-        // Content is smaller
-        height = sh < oh ? sh : oh;
-      }
-    }
-  }
-
-  return height;
-};
-
-
-/**
- * Gets the page scroll distance as a coordinate object.
- *
- * @param {Window=} opt_window Optional window element to test.
- * @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
- * @deprecated Use {@link goog.dom.getDocumentScroll} instead.
- */
-goog.dom.getPageScroll = function(opt_window) {
-  var win = opt_window || goog.global || window;
-  return goog.dom.getDomHelper(win.document).getDocumentScroll();
-};
-
-
-/**
- * Gets the document scroll distance as a coordinate object.
- *
- * @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
- */
-goog.dom.getDocumentScroll = function() {
-  return goog.dom.getDocumentScroll_(document);
-};
-
-
-/**
- * Helper for {@code getDocumentScroll}.
- *
- * @param {!Document} doc The document to get the scroll for.
- * @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
- * @private
- */
-goog.dom.getDocumentScroll_ = function(doc) {
-  var el = goog.dom.getDocumentScrollElement_(doc);
-  var win = goog.dom.getWindow_(doc);
-  if (goog.userAgent.IE && goog.userAgent.isVersionOrHigher('10') &&
-      win.pageYOffset != el.scrollTop) {
-    // The keyboard on IE10 touch devices shifts the page using the pageYOffset
-    // without modifying scrollTop. For this case, we want the body scroll
-    // offsets.
-    return new goog.math.Coordinate(el.scrollLeft, el.scrollTop);
-  }
-  return new goog.math.Coordinate(
-      win.pageXOffset || el.scrollLeft, win.pageYOffset || el.scrollTop);
-};
-
-
-/**
- * Gets the document scroll element.
- * @return {!Element} Scrolling element.
- */
-goog.dom.getDocumentScrollElement = function() {
-  return goog.dom.getDocumentScrollElement_(document);
-};
-
-
-/**
- * Helper for {@code getDocumentScrollElement}.
- * @param {!Document} doc The document to get the scroll element for.
- * @return {!Element} Scrolling element.
- * @private
- */
-goog.dom.getDocumentScrollElement_ = function(doc) {
-  // Old WebKit needs body.scrollLeft in both quirks mode and strict mode. We
-  // also default to the documentElement if the document does not have a body
-  // (e.g. a SVG document).
-  // Uses http://dev.w3.org/csswg/cssom-view/#dom-document-scrollingelement to
-  // avoid trying to guess about browser behavior from the UA string.
-  if (doc.scrollingElement) {
-    return doc.scrollingElement;
-  }
-  if (!goog.userAgent.WEBKIT && goog.dom.isCss1CompatMode_(doc)) {
-    return doc.documentElement;
-  }
-  return doc.body || doc.documentElement;
-};
-
-
-/**
- * Gets the window object associated with the given document.
- *
- * @param {Document=} opt_doc  Document object to get window for.
- * @return {!Window} The window associated with the given document.
- */
-goog.dom.getWindow = function(opt_doc) {
-  // TODO(arv): This should not take an argument.
-  return opt_doc ? goog.dom.getWindow_(opt_doc) : window;
-};
-
-
-/**
- * Helper for {@code getWindow}.
- *
- * @param {!Document} doc  Document object to get window for.
- * @return {!Window} The window associated with the given document.
- * @private
- */
-goog.dom.getWindow_ = function(doc) {
-  return doc.parentWindow || doc.defaultView;
-};
-
-
-/**
- * Returns a dom node with a set of attributes.  This function accepts varargs
- * for subsequent nodes to be added.  Subsequent nodes will be added to the
- * first node as childNodes.
- *
- * So:
- * <code>createDom('div', null, createDom('p'), createDom('p'));</code>
- * would return a div with two child paragraphs
- *
- * @param {string} tagName Tag to create.
- * @param {(Object|Array<string>|string)=} opt_attributes If object, then a map
- *     of name-value pairs for attributes. If a string, then this is the
- *     className of the new element. If an array, the elements will be joined
- *     together as the className of the new element.
- * @param {...(Object|string|Array|NodeList)} var_args Further DOM nodes or
- *     strings for text nodes. If one of the var_args is an array or NodeList,
- *     its elements will be added as childNodes instead.
- * @return {!Element} Reference to a DOM node.
- */
-goog.dom.createDom = function(tagName, opt_attributes, var_args) {
-  return goog.dom.createDom_(document, arguments);
-};
-
-
-/**
- * Helper for {@code createDom}.
- * @param {!Document} doc The document to create the DOM in.
- * @param {!Arguments} args Argument object passed from the callers. See
- *     {@code goog.dom.createDom} for details.
- * @return {!Element} Reference to a DOM node.
- * @private
- */
-goog.dom.createDom_ = function(doc, args) {
-  var tagName = args[0];
-  var attributes = args[1];
-
-  // Internet Explorer is dumb:
-  // name: https://msdn.microsoft.com/en-us/library/ms534184(v=vs.85).aspx
-  // type: https://msdn.microsoft.com/en-us/library/ms534700(v=vs.85).aspx
-  // Also does not allow setting of 'type' attribute on 'input' or 'button'.
-  if (!goog.dom.BrowserFeature.CAN_ADD_NAME_OR_TYPE_ATTRIBUTES && attributes &&
-      (attributes.name || attributes.type)) {
-    var tagNameArr = ['<', tagName];
-    if (attributes.name) {
-      tagNameArr.push(' name="', goog.string.htmlEscape(attributes.name), '"');
-    }
-    if (attributes.type) {
-      tagNameArr.push(' type="', goog.string.htmlEscape(attributes.type), '"');
-
-      // Clone attributes map to remove 'type' without mutating the input.
-      var clone = {};
-      goog.object.extend(clone, attributes);
-
-      // JSCompiler can't see how goog.object.extend added this property,
-      // because it was essentially added by reflection.
-      // So it needs to be quoted.
-      delete clone['type'];
-
-      attributes = clone;
-    }
-    tagNameArr.push('>');
-    tagName = tagNameArr.join('');
-  }
-
-  var element = doc.createElement(tagName);
-
-  if (attributes) {
-    if (goog.isString(attributes)) {
-      element.className = attributes;
-    } else if (goog.isArray(attributes)) {
-      element.className = attributes.join(' ');
-    } else {
-      goog.dom.setProperties(element, attributes);
-    }
-  }
-
-  if (args.length > 2) {
-    goog.dom.append_(doc, element, args, 2);
-  }
-
-  return element;
-};
-
-
-/**
- * Appends a node with text or other nodes.
- * @param {!Document} doc The document to create new nodes in.
- * @param {!Node} parent The node to append nodes to.
- * @param {!Arguments} args The values to add. See {@code goog.dom.append}.
- * @param {number} startIndex The index of the array to start from.
- * @private
- */
-goog.dom.append_ = function(doc, parent, args, startIndex) {
-  function childHandler(child) {
-    // TODO(user): More coercion, ala MochiKit?
-    if (child) {
-      parent.appendChild(
-          goog.isString(child) ? doc.createTextNode(child) : child);
-    }
-  }
-
-  for (var i = startIndex; i < args.length; i++) {
-    var arg = args[i];
-    // TODO(attila): Fix isArrayLike to return false for a text node.
-    if (goog.isArrayLike(arg) && !goog.dom.isNodeLike(arg)) {
-      // If the argument is a node list, not a real array, use a clone,
-      // because forEach can't be used to mutate a NodeList.
-      goog.array.forEach(
-          goog.dom.isNodeList(arg) ? goog.array.toArray(arg) : arg,
-          childHandler);
-    } else {
-      childHandler(arg);
-    }
-  }
-};
-
-
-/**
- * Alias for {@code createDom}.
- * @param {string} tagName Tag to create.
- * @param {(string|Object)=} opt_attributes If object, then a map of name-value
- *     pairs for attributes. If a string, then this is the className of the new
- *     element.
- * @param {...(Object|string|Array|NodeList)} var_args Further DOM nodes or
- *     strings for text nodes. If one of the var_args is an array, its
- *     children will be added as childNodes instead.
- * @return {!Element} Reference to a DOM node.
- * @deprecated Use {@link goog.dom.createDom} instead.
- */
-goog.dom.$dom = goog.dom.createDom;
-
-
-/**
- * Creates a new element.
- * @param {string} name Tag name.
- * @return {!Element} The new element.
- */
-goog.dom.createElement = function(name) {
-  return document.createElement(name);
-};
-
-
-/**
- * Creates a new text node.
- * @param {number|string} content Content.
- * @return {!Text} The new text node.
- */
-goog.dom.createTextNode = function(content) {
-  return document.createTextNode(String(content));
-};
-
-
-/**
- * Create a table.
- * @param {number} rows The number of rows in the table.  Must be >= 1.
- * @param {number} columns The number of columns in the table.  Must be >= 1.
- * @param {boolean=} opt_fillWithNbsp If true, fills table entries with
- *     {@code goog.string.Unicode.NBSP} characters.
- * @return {!Element} The created table.
- */
-goog.dom.createTable = function(rows, columns, opt_fillWithNbsp) {
-  // TODO(user): Return HTMLTableElement, also in prototype function.
-  // Callers need to be updated to e.g. not assign numbers to table.cellSpacing.
-  return goog.dom.createTable_(document, rows, columns, !!opt_fillWithNbsp);
-};
-
-
-/**
- * Create a table.
- * @param {!Document} doc Document object to use to create the table.
- * @param {number} rows The number of rows in the table.  Must be >= 1.
- * @param {number} columns The number of columns in the table.  Must be >= 1.
- * @param {boolean} fillWithNbsp If true, fills table entries with
- *     {@code goog.string.Unicode.NBSP} characters.
- * @return {!HTMLTableElement} The created table.
- * @private
- */
-goog.dom.createTable_ = function(doc, rows, columns, fillWithNbsp) {
-  var table = /** @type {!HTMLTableElement} */
-      (doc.createElement(goog.dom.TagName.TABLE));
-  var tbody = table.appendChild(doc.createElement(goog.dom.TagName.TBODY));
-  for (var i = 0; i < rows; i++) {
-    var tr = doc.createElement(goog.dom.TagName.TR);
-    for (var j = 0; j < columns; j++) {
-      var td = doc.createElement(goog.dom.TagName.TD);
-      // IE <= 9 will create a text node if we set text content to the empty
-      // string, so we avoid doing it unless necessary. This ensures that the
-      // same DOM tree is returned on all browsers.
-      if (fillWithNbsp) {
-        goog.dom.setTextContent(td, goog.string.Unicode.NBSP);
-      }
-      tr.appendChild(td);
-    }
-    tbody.appendChild(tr);
-  }
-  return table;
-};
-
-
-
-/**
- * Creates a new Node from constant strings of HTML markup.
- * @param {...!goog.string.Const} var_args The HTML strings to concatenate then
- *     convert into a node.
- * @return {!Node}
- */
-goog.dom.constHtmlToNode = function(var_args) {
-  var stringArray = goog.array.map(arguments, goog.string.Const.unwrap);
-  var safeHtml =
-      goog.html.uncheckedconversions
-          .safeHtmlFromStringKnownToSatisfyTypeContract(
-              goog.string.Const.from(
-                  'Constant HTML string, that gets turned into a ' +
-                  'Node later, so it will be automatically balanced.'),
-              stringArray.join(''));
-  return goog.dom.safeHtmlToNode(safeHtml);
-};
-
-
-/**
- * Converts HTML markup into a node. This is a safe version of
- * {@code goog.dom.htmlToDocumentFragment} which is now deleted.
- * @param {!goog.html.SafeHtml} html The HTML markup to convert.
- * @return {!Node} The resulting node.
- */
-goog.dom.safeHtmlToNode = function(html) {
-  return goog.dom.safeHtmlToNode_(document, html);
-};
-
-
-/**
- * Helper for {@code safeHtmlToNode}.
- * @param {!Document} doc The document.
- * @param {!goog.html.SafeHtml} html The HTML markup to convert.
- * @return {!Node} The resulting node.
- * @private
- */
-goog.dom.safeHtmlToNode_ = function(doc, html) {
-  var tempDiv = doc.createElement(goog.dom.TagName.DIV);
-  if (goog.dom.BrowserFeature.INNER_HTML_NEEDS_SCOPED_ELEMENT) {
-    goog.dom.safe.setInnerHtml(
-        tempDiv, goog.html.SafeHtml.concat(goog.html.SafeHtml.BR, html));
-    tempDiv.removeChild(tempDiv.firstChild);
-  } else {
-    goog.dom.safe.setInnerHtml(tempDiv, html);
-  }
-  return goog.dom.childrenToNode_(doc, tempDiv);
-};
-
-
-/**
- * Helper for {@code safeHtmlToNode_}.
- * @param {!Document} doc The document.
- * @param {!Node} tempDiv The input node.
- * @return {!Node} The resulting node.
- * @private
- */
-goog.dom.childrenToNode_ = function(doc, tempDiv) {
-  if (tempDiv.childNodes.length == 1) {
-    return tempDiv.removeChild(tempDiv.firstChild);
-  } else {
-    var fragment = doc.createDocumentFragment();
-    while (tempDiv.firstChild) {
-      fragment.appendChild(tempDiv.firstChild);
-    }
-    return fragment;
-  }
-};
-
-
-/**
- * Returns true if the browser is in "CSS1-compatible" (standards-compliant)
- * mode, false otherwise.
- * @return {boolean} True if in CSS1-compatible mode.
- */
-goog.dom.isCss1CompatMode = function() {
-  return goog.dom.isCss1CompatMode_(document);
-};
-
-
-/**
- * Returns true if the browser is in "CSS1-compatible" (standards-compliant)
- * mode, false otherwise.
- * @param {!Document} doc The document to check.
- * @return {boolean} True if in CSS1-compatible mode.
- * @private
- */
-goog.dom.isCss1CompatMode_ = function(doc) {
-  if (goog.dom.COMPAT_MODE_KNOWN_) {
-    return goog.dom.ASSUME_STANDARDS_MODE;
-  }
-
-  return doc.compatMode == 'CSS1Compat';
-};
-
-
-/**
- * Determines if the given node can contain children, intended to be used for
- * HTML generation.
- *
- * IE natively supports node.canHaveChildren but has inconsistent behavior.
- * Prior to IE8 the base tag allows children and in IE9 all nodes return true
- * for canHaveChildren.
- *
- * In practice all non-IE browsers allow you to add children to any node, but
- * the behavior is inconsistent:
- *
- * <pre>
- *   var a = document.createElement(goog.dom.TagName.BR);
- *   a.appendChild(document.createTextNode('foo'));
- *   a.appendChild(document.createTextNode('bar'));
- *   console.log(a.childNodes.length);  // 2
- *   console.log(a.innerHTML);  // Chrome: "", IE9: "foobar", FF3.5: "foobar"
- * </pre>
- *
- * For more information, see:
- * http://dev.w3.org/html5/markup/syntax.html#syntax-elements
- *
- * TODO(user): Rename shouldAllowChildren() ?
- *
- * @param {Node} node The node to check.
- * @return {boolean} Whether the node can contain children.
- */
-goog.dom.canHaveChildren = function(node) {
-  if (node.nodeType != goog.dom.NodeType.ELEMENT) {
-    return false;
-  }
-  switch (/** @type {!Element} */ (node).tagName) {
-    case goog.dom.TagName.APPLET:
-    case goog.dom.TagName.AREA:
-    case goog.dom.TagName.BASE:
-    case goog.dom.TagName.BR:
-    case goog.dom.TagName.COL:
-    case goog.dom.TagName.COMMAND:
-    case goog.dom.TagName.EMBED:
-    case goog.dom.TagName.FRAME:
-    case goog.dom.TagName.HR:
-    case goog.dom.TagName.IMG:
-    case goog.dom.TagName.INPUT:
-    case goog.dom.TagName.IFRAME:
-    case goog.dom.TagName.ISINDEX:
-    case goog.dom.TagName.KEYGEN:
-    case goog.dom.TagName.LINK:
-    case goog.dom.TagName.NOFRAMES:
-    case goog.dom.TagName.NOSCRIPT:
-    case goog.dom.TagName.META:
-    case goog.dom.TagName.OBJECT:
-    case goog.dom.TagName.PARAM:
-    case goog.dom.TagName.SCRIPT:
-    case goog.dom.TagName.SOURCE:
-    case goog.dom.TagName.STYLE:
-    case goog.dom.TagName.TRACK:
-    case goog.dom.TagName.WBR:
-      return false;
-  }
-  return true;
-};
-
-
-/**
- * Appends a child to a node.
- * @param {Node} parent Parent.
- * @param {Node} child Child.
- */
-goog.dom.appendChild = function(parent, child) {
-  parent.appendChild(child);
-};
-
-
-/**
- * Appends a node with text or other nodes.
- * @param {!Node} parent The node to append nodes to.
- * @param {...goog.dom.Appendable} var_args The things to append to the node.
- *     If this is a Node it is appended as is.
- *     If this is a string then a text node is appended.
- *     If this is an array like object then fields 0 to length - 1 are appended.
- */
-goog.dom.append = function(parent, var_args) {
-  goog.dom.append_(goog.dom.getOwnerDocument(parent), parent, arguments, 1);
-};
-
-
-/**
- * Removes all the child nodes on a DOM node.
- * @param {Node} node Node to remove children from.
- */
-goog.dom.removeChildren = function(node) {
-  // Note: Iterations over live collections can be slow, this is the fastest
-  // we could find. The double parenthesis are used to prevent JsCompiler and
-  // strict warnings.
-  var child;
-  while ((child = node.firstChild)) {
-    node.removeChild(child);
-  }
-};
-
-
-/**
- * Inserts a new node before an existing reference node (i.e. as the previous
- * sibling). If the reference node has no parent, then does nothing.
- * @param {Node} newNode Node to insert.
- * @param {Node} refNode Reference node to insert before.
- */
-goog.dom.insertSiblingBefore = function(newNode, refNode) {
-  if (refNode.parentNode) {
-    refNode.parentNode.insertBefore(newNode, refNode);
-  }
-};
-
-
-/**
- * Inserts a new node after an existing reference node (i.e. as the next
- * sibling). If the reference node has no parent, then does nothing.
- * @param {Node} newNode Node to insert.
- * @param {Node} refNode Reference node to insert after.
- */
-goog.dom.insertSiblingAfter = function(newNode, refNode) {
-  if (refNode.parentNode) {
-    refNode.parentNode.insertBefore(newNode, refNode.nextSibling);
-  }
-};
-
-
-/**
- * Insert a child at a given index. If index is larger than the number of child
- * nodes that the parent currently has, the node is inserted as the last child
- * node.
- * @param {Element} parent The element into which to insert the child.
- * @param {Node} child The element to insert.
- * @param {number} index The index at which to insert the new child node. Must
- *     not be negative.
- */
-goog.dom.insertChildAt = function(parent, child, index) {
-  // Note that if the second argument is null, insertBefore
-  // will append the child at the end of the list of children.
-  parent.insertBefore(child, parent.childNodes[index] || null);
-};
-
-
-/**
- * Removes a node from its parent.
- * @param {Node} node The node to remove.
- * @return {Node} The node removed if removed; else, null.
- */
-goog.dom.removeNode = function(node) {
-  return node && node.parentNode ? node.parentNode.removeChild(node) : null;
-};
-
-
-/**
- * Replaces a node in the DOM tree. Will do nothing if {@code oldNode} has no
- * parent.
- * @param {Node} newNode Node to insert.
- * @param {Node} oldNode Node to replace.
- */
-goog.dom.replaceNode = function(newNode, oldNode) {
-  var parent = oldNode.parentNode;
-  if (parent) {
-    parent.replaceChild(newNode, oldNode);
-  }
-};
-
-
-/**
- * Flattens an element. That is, removes it and replace it with its children.
- * Does nothing if the element is not in the document.
- * @param {Element} element The element to flatten.
- * @return {Element|undefined} The original element, detached from the document
- *     tree, sans children; or undefined, if the element was not in the document
- *     to begin with.
- */
-goog.dom.flattenElement = function(element) {
-  var child, parent = element.parentNode;
-  if (parent && parent.nodeType != goog.dom.NodeType.DOCUMENT_FRAGMENT) {
-    // Use IE DOM method (supported by Opera too) if available
-    if (element.removeNode) {
-      return /** @type {Element} */ (element.removeNode(false));
-    } else {
-      // Move all children of the original node up one level.
-      while ((child = element.firstChild)) {
-        parent.insertBefore(child, element);
-      }
-
-      // Detach the original element.
-      return /** @type {Element} */ (goog.dom.removeNode(element));
-    }
-  }
-};
-
-
-/**
- * Returns an array containing just the element children of the given element.
- * @param {Element} element The element whose element children we want.
- * @return {!(Array<!Element>|NodeList<!Element>)} An array or array-like list
- *     of just the element children of the given element.
- */
-goog.dom.getChildren = function(element) {
-  // We check if the children attribute is supported for child elements
-  // since IE8 misuses the attribute by also including comments.
-  if (goog.dom.BrowserFeature.CAN_USE_CHILDREN_ATTRIBUTE &&
-      element.children != undefined) {
-    return element.children;
-  }
-  // Fall back to manually filtering the element's child nodes.
-  return goog.array.filter(element.childNodes, function(node) {
-    return node.nodeType == goog.dom.NodeType.ELEMENT;
-  });
-};
-
-
-/**
- * Returns the first child node that is an element.
- * @param {Node} node The node to get the first child element of.
- * @return {Element} The first child node of {@code node} that is an element.
- */
-goog.dom.getFirstElementChild = function(node) {
-  if (goog.isDef(node.firstElementChild)) {
-    return /** @type {!Element} */ (node).firstElementChild;
-  }
-  return goog.dom.getNextElementNode_(node.firstChild, true);
-};
-
-
-/**
- * Returns the last child node that is an element.
- * @param {Node} node The node to get the last child element of.
- * @return {Element} The last child node of {@code node} that is an element.
- */
-goog.dom.getLastElementChild = function(node) {
-  if (goog.isDef(node.lastElementChild)) {
-    return /** @type {!Element} */ (node).lastElementChild;
-  }
-  return goog.dom.getNextElementNode_(node.lastChild, false);
-};
-
-
-/**
- * Returns the first next sibling that is an element.
- * @param {Node} node The node to get the next sibling element of.
- * @return {Element} The next sibling of {@code node} that is an element.
- */
-goog.dom.getNextElementSibling = function(node) {
-  if (goog.isDef(node.nextElementSibling)) {
-    return /** @type {!Element} */ (node).nextElementSibling;
-  }
-  return goog.dom.getNextElementNode_(node.nextSibling, true);
-};
-
-
-/**
- * Returns the first previous sibling that is an element.
- * @param {Node} node The node to get the previous sibling element of.
- * @return {Element} The first previous sibling of {@code node} that is
- *     an element.
- */
-goog.dom.getPreviousElementSibling = function(node) {
-  if (goog.isDef(node.previousElementSibling)) {
-    return /** @type {!Element} */ (node).previousElementSibling;
-  }
-  return goog.dom.getNextElementNode_(node.previousSibling, false);
-};
-
-
-/**
- * Returns the first node that is an element in the specified direction,
- * starting with {@code node}.
- * @param {Node} node The node to get the next element from.
- * @param {boolean} forward Whether to look forwards or backwards.
- * @return {Element} The first element.
- * @private
- */
-goog.dom.getNextElementNode_ = function(node, forward) {
-  while (node && node.nodeType != goog.dom.NodeType.ELEMENT) {
-    node = forward ? node.nextSibling : node.previousSibling;
-  }
-
-  return /** @type {Element} */ (node);
-};
-
-
-/**
- * Returns the next node in source order from the given node.
- * @param {Node} node The node.
- * @return {Node} The next node in the DOM tree, or null if this was the last
- *     node.
- */
-goog.dom.getNextNode = function(node) {
-  if (!node) {
-    return null;
-  }
-
-  if (node.firstChild) {
-    return node.firstChild;
-  }
-
-  while (node && !node.nextSibling) {
-    node = node.parentNode;
-  }
-
-  return node ? node.nextSibling : null;
-};
-
-
-/**
- * Returns the previous node in source order from the given node.
- * @param {Node} node The node.
- * @return {Node} The previous node in the DOM tree, or null if this was the
- *     first node.
- */
-goog.dom.getPreviousNode = function(node) {
-  if (!node) {
-    return null;
-  }
-
-  if (!node.previousSibling) {
-    return node.parentNode;
-  }
-
-  node = node.previousSibling;
-  while (node && node.lastChild) {
-    node = node.lastChild;
-  }
-
-  return node;
-};
-
-
-/**
- * Whether the object looks like a DOM node.
- * @param {?} obj The object being tested for node likeness.
- * @return {boolean} Whether the object looks like a DOM node.
- */
-goog.dom.isNodeLike = function(obj) {
-  return goog.isObject(obj) && obj.nodeType > 0;
-};
-
-
-/**
- * Whether the object looks like an Element.
- * @param {?} obj The object being tested for Element likeness.
- * @return {boolean} Whether the object looks like an Element.
- */
-goog.dom.isElement = function(obj) {
-  return goog.isObject(obj) && obj.nodeType == goog.dom.NodeType.ELEMENT;
-};
-
-
-/**
- * Returns true if the specified value is a Window object. This includes the
- * global window for HTML pages, and iframe windows.
- * @param {?} obj Variable to test.
- * @return {boolean} Whether the variable is a window.
- */
-goog.dom.isWindow = function(obj) {
-  return goog.isObject(obj) && obj['window'] == obj;
-};
-
-
-/**
- * Returns an element's parent, if it's an Element.
- * @param {Element} element The DOM element.
- * @return {Element} The parent, or null if not an Element.
- */
-goog.dom.getParentElement = function(element) {
-  var parent;
-  if (goog.dom.BrowserFeature.CAN_USE_PARENT_ELEMENT_PROPERTY) {
-    var isIe9 = goog.userAgent.IE && goog.userAgent.isVersionOrHigher('9') &&
-        !goog.userAgent.isVersionOrHigher('10');
-    // SVG elements in IE9 can't use the parentElement property.
-    // goog.global['SVGElement'] is not defined in IE9 quirks mode.
-    if (!(isIe9 && goog.global['SVGElement'] &&
-          element instanceof goog.global['SVGElement'])) {
-      parent = element.parentElement;
-      if (parent) {
-        return parent;
-      }
-    }
-  }
-  parent = element.parentNode;
-  return goog.dom.isElement(parent) ? /** @type {!Element} */ (parent) : null;
-};
-
-
-/**
- * Whether a node contains another node.
- * @param {?Node} parent The node that should contain the other node.
- * @param {?Node} descendant The node to test presence of.
- * @return {boolean} Whether the parent node contains the descendent node.
- */
-goog.dom.contains = function(parent, descendant) {
-  if (!parent || !descendant) {
-    return false;
-  }
-  // We use browser specific methods for this if available since it is faster
-  // that way.
-
-  // IE DOM
-  if (parent.contains && descendant.nodeType == goog.dom.NodeType.ELEMENT) {
-    return parent == descendant || parent.contains(descendant);
-  }
-
-  // W3C DOM Level 3
-  if (typeof parent.compareDocumentPosition != 'undefined') {
-    return parent == descendant ||
-        Boolean(parent.compareDocumentPosition(descendant) & 16);
-  }
-
-  // W3C DOM Level 1
-  while (descendant && parent != descendant) {
-    descendant = descendant.parentNode;
-  }
-  return descendant == parent;
-};
-
-
-/**
- * Compares the document order of two nodes, returning 0 if they are the same
- * node, a negative number if node1 is before node2, and a positive number if
- * node2 is before node1.  Note that we compare the order the tags appear in the
- * document so in the tree <b><i>text</i></b> the B node is considered to be
- * before the I node.
- *
- * @param {Node} node1 The first node to compare.
- * @param {Node} node2 The second node to compare.
- * @return {number} 0 if the nodes are the same node, a negative number if node1
- *     is before node2, and a positive number if node2 is before node1.
- */
-goog.dom.compareNodeOrder = function(node1, node2) {
-  // Fall out quickly for equality.
-  if (node1 == node2) {
-    return 0;
-  }
-
-  // Use compareDocumentPosition where available
-  if (node1.compareDocumentPosition) {
-    // 4 is the bitmask for FOLLOWS.
-    return node1.compareDocumentPosition(node2) & 2 ? 1 : -1;
-  }
-
-  // Special case for document nodes on IE 7 and 8.
-  if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9)) {
-    if (node1.nodeType == goog.dom.NodeType.DOCUMENT) {
-      return -1;
-    }
-    if (node2.nodeType == goog.dom.NodeType.DOCUMENT) {
-      return 1;
-    }
-  }
-
-  // Process in IE using sourceIndex - we check to see if the first node has
-  // a source index or if its parent has one.
-  if ('sourceIndex' in node1 ||
-      (node1.parentNode && 'sourceIndex' in node1.parentNode)) {
-    var isElement1 = node1.nodeType == goog.dom.NodeType.ELEMENT;
-    var isElement2 = node2.nodeType == goog.dom.NodeType.ELEMENT;
-
-    if (isElement1 && isElement2) {
-      return node1.sourceIndex - node2.sourceIndex;
-    } else {
-      var parent1 = node1.parentNode;
-      var parent2 = node2.parentNode;
-
-      if (parent1 == parent2) {
-        return goog.dom.compareSiblingOrder_(node1, node2);
-      }
-
-      if (!isElement1 && goog.dom.contains(parent1, node2)) {
-        return -1 * goog.dom.compareParentsDescendantNodeIe_(node1, node2);
-      }
-
-
-      if (!isElement2 && goog.dom.contains(parent2, node1)) {
-        return goog.dom.compareParentsDescendantNodeIe_(node2, node1);
-      }
-
-      return (isElement1 ? node1.sourceIndex : parent1.sourceIndex) -
-          (isElement2 ? node2.sourceIndex : parent2.sourceIndex);
-    }
-  }
-
-  // For Safari, we compare ranges.
-  var doc = goog.dom.getOwnerDocument(node1);
-
-  var range1, range2;
-  range1 = doc.createRange();
-  range1.selectNode(node1);
-  range1.collapse(true);
-
-  range2 = doc.createRange();
-  range2.selectNode(node2);
-  range2.collapse(true);
-
-  return range1.compareBoundaryPoints(
-      goog.global['Range'].START_TO_END, range2);
-};
-
-
-/**
- * Utility function to compare the position of two nodes, when
- * {@code textNode}'s parent is an ancestor of {@code node}.  If this entry
- * condition is not met, this function will attempt to reference a null object.
- * @param {!Node} textNode The textNode to compare.
- * @param {Node} node The node to compare.
- * @return {number} -1 if node is before textNode, +1 otherwise.
- * @private
- */
-goog.dom.compareParentsDescendantNodeIe_ = function(textNode, node) {
-  var parent = textNode.parentNode;
-  if (parent == node) {
-    // If textNode is a child of node, then node comes first.
-    return -1;
-  }
-  var sibling = node;
-  while (sibling.parentNode != parent) {
-    sibling = sibling.parentNode;
-  }
-  return goog.dom.compareSiblingOrder_(sibling, textNode);
-};
-
-
-/**
- * Utility function to compare the position of two nodes known to be non-equal
- * siblings.
- * @param {Node} node1 The first node to compare.
- * @param {!Node} node2 The second node to compare.
- * @return {number} -1 if node1 is before node2, +1 otherwise.
- * @private
- */
-goog.dom.compareSiblingOrder_ = function(node1, node2) {
-  var s = node2;
-  while ((s = s.previousSibling)) {
-    if (s == node1) {
-      // We just found node1 before node2.
-      return -1;
-    }
-  }
-
-  // Since we didn't find it, node1 must be after node2.
-  return 1;
-};
-
-
-/**
- * Find the deepest common ancestor of the given nodes.
- * @param {...Node} var_args The nodes to find a common ancestor of.
- * @return {Node} The common ancestor of the nodes, or null if there is none.
- *     null will only be returned if two or more of the nodes are from different
- *     documents.
- */
-goog.dom.findCommonAncestor = function(var_args) {
-  var i, count = arguments.length;
-  if (!count) {
-    return null;
-  } else if (count == 1) {
-    return arguments[0];
-  }
-
-  var paths = [];
-  var minLength = Infinity;
-  for (i = 0; i < count; i++) {
-    // Compute the list of ancestors.
-    var ancestors = [];
-    var node = arguments[i];
-    while (node) {
-      ancestors.unshift(node);
-      node = node.parentNode;
-    }
-
-    // Save the list for comparison.
-    paths.push(ancestors);
-    minLength = Math.min(minLength, ancestors.length);
-  }
-  var output = null;
-  for (i = 0; i < minLength; i++) {
-    var first = paths[0][i];
-    for (var j = 1; j < count; j++) {
-      if (first != paths[j][i]) {
-        return output;
-      }
-    }
-    output = first;
-  }
-  return output;
-};
-
-
-/**
- * Returns the owner document for a node.
- * @param {Node|Window} node The node to get the document for.
- * @return {!Document} The document owning the node.
- */
-goog.dom.getOwnerDocument = function(node) {
-  // TODO(nnaze): Update param signature to be non-nullable.
-  goog.asserts.assert(node, 'Node cannot be null or undefined.');
-  return /** @type {!Document} */ (
-      node.nodeType == goog.dom.NodeType.DOCUMENT ? node : node.ownerDocument ||
-              node.document);
-};
-
-
-/**
- * Cross-browser function for getting the document element of a frame or iframe.
- * @param {Element} frame Frame element.
- * @return {!Document} The frame content document.
- */
-goog.dom.getFrameContentDocument = function(frame) {
-  return frame.contentDocument ||
-      /** @type {!HTMLFrameElement} */ (frame).contentWindow.document;
-};
-
-
-/**
- * Cross-browser function for getting the window of a frame or iframe.
- * @param {Element} frame Frame element.
- * @return {Window} The window associated with the given frame, or null if none
- *     exists.
- */
-goog.dom.getFrameContentWindow = function(frame) {
-  try {
-    return frame.contentWindow ||
-        (frame.contentDocument ? goog.dom.getWindow(frame.contentDocument) :
-                                 null);
-  } catch (e) {
-    // NOTE(user): In IE8, checking the contentWindow or contentDocument
-    // properties will throw a "Unspecified Error" exception if the iframe is
-    // not inserted in the DOM. If we get this we can be sure that no window
-    // exists, so return null.
-  }
-  return null;
-};
-
-
-/**
- * Sets the text content of a node, with cross-browser support.
- * @param {Node} node The node to change the text content of.
- * @param {string|number} text The value that should replace the node's content.
- */
-goog.dom.setTextContent = function(node, text) {
-  goog.asserts.assert(
-      node != null,
-      'goog.dom.setTextContent expects a non-null value for node');
-
-  if ('textContent' in node) {
-    node.textContent = text;
-  } else if (node.nodeType == goog.dom.NodeType.TEXT) {
-    node.data = text;
-  } else if (
-      node.firstChild && node.firstChild.nodeType == goog.dom.NodeType.TEXT) {
-    // If the first child is a text node we just change its data and remove the
-    // rest of the children.
-    while (node.lastChild != node.firstChild) {
-      node.removeChild(node.lastChild);
-    }
-    node.firstChild.data = text;
-  } else {
-    goog.dom.removeChildren(node);
-    var doc = goog.dom.getOwnerDocument(node);
-    node.appendChild(doc.createTextNode(String(text)));
-  }
-};
-
-
-/**
- * Gets the outerHTML of a node, which islike innerHTML, except that it
- * actually contains the HTML of the node itself.
- * @param {Element} element The element to get the HTML of.
- * @return {string} The outerHTML of the given element.
- */
-goog.dom.getOuterHtml = function(element) {
-  goog.asserts.assert(
-      element !== null,
-      'goog.dom.getOuterHtml expects a non-null value for element');
-  // IE, Opera and WebKit all have outerHTML.
-  if ('outerHTML' in element) {
-    return element.outerHTML;
-  } else {
-    var doc = goog.dom.getOwnerDocument(element);
-    var div = doc.createElement(goog.dom.TagName.DIV);
-    div.appendChild(element.cloneNode(true));
-    return div.innerHTML;
-  }
-};
-
-
-/**
- * Finds the first descendant node that matches the filter function, using
- * a depth first search. This function offers the most general purpose way
- * of finding a matching element. You may also wish to consider
- * {@code goog.dom.query} which can express many matching criteria using
- * CSS selector expressions. These expressions often result in a more
- * compact representation of the desired result.
- * @see goog.dom.query
- *
- * @param {Node} root The root of the tree to search.
- * @param {function(Node) : boolean} p The filter function.
- * @return {Node|undefined} The found node or undefined if none is found.
- */
-goog.dom.findNode = function(root, p) {
-  var rv = [];
-  var found = goog.dom.findNodes_(root, p, rv, true);
-  return found ? rv[0] : undefined;
-};
-
-
-/**
- * Finds all the descendant nodes that match the filter function, using a
- * a depth first search. This function offers the most general-purpose way
- * of finding a set of matching elements. You may also wish to consider
- * {@code goog.dom.query} which can express many matching criteria using
- * CSS selector expressions. These expressions often result in a more
- * compact representation of the desired result.
-
- * @param {Node} root The root of the tree to search.
- * @param {function(Node) : boolean} p The filter function.
- * @return {!Array<!Node>} The found nodes or an empty array if none are found.
- */
-goog.dom.findNodes = function(root, p) {
-  var rv = [];
-  goog.dom.findNodes_(root, p, rv, false);
-  return rv;
-};
-
-
-/**
- * Finds the first or all the descendant nodes that match the filter function,
- * using a depth first search.
- * @param {Node} root The root of the tree to search.
- * @param {function(Node) : boolean} p The filter function.
- * @param {!Array<!Node>} rv The found nodes are added to this array.
- * @param {boolean} findOne If true we exit after the first found node.
- * @return {boolean} Whether the search is complete or not. True in case findOne
- *     is true and the node is found. False otherwise.
- * @private
- */
-goog.dom.findNodes_ = function(root, p, rv, findOne) {
-  if (root != null) {
-    var child = root.firstChild;
-    while (child) {
-      if (p(child)) {
-        rv.push(child);
-        if (findOne) {
-          return true;
-        }
-      }
-      if (goog.dom.findNodes_(child, p, rv, findOne)) {
-        return true;
-      }
-      child = child.nextSibling;
-    }
-  }
-  return false;
-};
-
-
-/**
- * Map of tags whose content to ignore when calculating text length.
- * @private {!Object<string, number>}
- * @const
- */
-goog.dom.TAGS_TO_IGNORE_ = {
-  'SCRIPT': 1,
-  'STYLE': 1,
-  'HEAD': 1,
-  'IFRAME': 1,
-  'OBJECT': 1
-};
-
-
-/**
- * Map of tags which have predefined values with regard to whitespace.
- * @private {!Object<string, string>}
- * @const
- */
-goog.dom.PREDEFINED_TAG_VALUES_ = {
-  'IMG': ' ',
-  'BR': '\n'
-};
-
-
-/**
- * Returns true if the element has a tab index that allows it to receive
- * keyboard focus (tabIndex >= 0), false otherwise.  Note that some elements
- * natively support keyboard focus, even if they have no tab index.
- * @param {!Element} element Element to check.
- * @return {boolean} Whether the element has a tab index that allows keyboard
- *     focus.
- */
-goog.dom.isFocusableTabIndex = function(element) {
-  return goog.dom.hasSpecifiedTabIndex_(element) &&
-      goog.dom.isTabIndexFocusable_(element);
-};
-
-
-/**
- * Enables or disables keyboard focus support on the element via its tab index.
- * Only elements for which {@link goog.dom.isFocusableTabIndex} returns true
- * (or elements that natively support keyboard focus, like form elements) can
- * receive keyboard focus.  See http://go/tabindex for more info.
- * @param {Element} element Element whose tab index is to be changed.
- * @param {boolean} enable Whether to set or remove a tab index on the element
- *     that supports keyboard focus.
- */
-goog.dom.setFocusableTabIndex = function(element, enable) {
-  if (enable) {
-    element.tabIndex = 0;
-  } else {
-    // Set tabIndex to -1 first, then remove it. This is a workaround for
-    // Safari (confirmed in version 4 on Windows). When removing the attribute
-    // without setting it to -1 first, the element remains keyboard focusable
-    // despite not having a tabIndex attribute anymore.
-    element.tabIndex = -1;
-    element.removeAttribute('tabIndex');  // Must be camelCase!
-  }
-};
-
-
-/**
- * Returns true if the element can be focused, i.e. it has a tab index that
- * allows it to receive keyboard focus (tabIndex >= 0), or it is an element
- * that natively supports keyboard focus.
- * @param {!Element} element Element to check.
- * @return {boolean} Whether the element allows keyboard focus.
- */
-goog.dom.isFocusable = function(element) {
-  var focusable;
-  // Some elements can have unspecified tab index and still receive focus.
-  if (goog.dom.nativelySupportsFocus_(element)) {
-    // Make sure the element is not disabled ...
-    focusable = !element.disabled &&
-        // ... and if a tab index is specified, it allows focus.
-        (!goog.dom.hasSpecifiedTabIndex_(element) ||
-         goog.dom.isTabIndexFocusable_(element));
-  } else {
-    focusable = goog.dom.isFocusableTabIndex(element);
-  }
-
-  // IE requires elements to be visible in order to focus them.
-  return focusable && goog.userAgent.IE ?
-      goog.dom.hasNonZeroBoundingRect_(/** @type {!HTMLElement} */ (element)) :
-      focusable;
-};
-
-
-/**
- * Returns true if the element has a specified tab index.
- * @param {!Element} element Element to check.
- * @return {boolean} Whether the element has a specified tab index.
- * @private
- */
-goog.dom.hasSpecifiedTabIndex_ = function(element) {
-  // IE returns 0 for an unset tabIndex, so we must use getAttributeNode(),
-  // which returns an object with a 'specified' property if tabIndex is
-  // specified.  This works on other browsers, too.
-  var attrNode = element.getAttributeNode('tabindex');  // Must be lowercase!
-  return goog.isDefAndNotNull(attrNode) && attrNode.specified;
-};
-
-
-/**
- * Returns true if the element's tab index allows the element to be focused.
- * @param {!Element} element Element to check.
- * @return {boolean} Whether the element's tab index allows focus.
- * @private
- */
-goog.dom.isTabIndexFocusable_ = function(element) {
-  var index = /** @type {!HTMLElement} */ (element).tabIndex;
-  // NOTE: IE9 puts tabIndex in 16-bit int, e.g. -2 is 65534.
-  return goog.isNumber(index) && index >= 0 && index < 32768;
-};
-
-
-/**
- * Returns true if the element is focusable even when tabIndex is not set.
- * @param {!Element} element Element to check.
- * @return {boolean} Whether the element natively supports focus.
- * @private
- */
-goog.dom.nativelySupportsFocus_ = function(element) {
-  return element.tagName == goog.dom.TagName.A ||
-      element.tagName == goog.dom.TagName.INPUT ||
-      element.tagName == goog.dom.TagName.TEXTAREA ||
-      element.tagName == goog.dom.TagName.SELECT ||
-      element.tagName == goog.dom.TagName.BUTTON;
-};
-
-
-/**
- * Returns true if the element has a bounding rectangle that would be visible
- * (i.e. its width and height are greater than zero).
- * @param {!HTMLElement} element Element to check.
- * @return {boolean} Whether the element has a non-zero bounding rectangle.
- * @private
- */
-goog.dom.hasNonZeroBoundingRect_ = function(element) {
-  var rect;
-  if (!goog.isFunction(element['getBoundingClientRect']) ||
-      // In IE, getBoundingClientRect throws on detached nodes.
-      (goog.userAgent.IE && element.parentElement == null)) {
-    rect = {'height': element.offsetHeight, 'width': element.offsetWidth};
-  } else {
-    rect = element.getBoundingClientRect();
-  }
-  return goog.isDefAndNotNull(rect) && rect.height > 0 && rect.width > 0;
-};
-
-
-/**
- * Returns the text content of the current node, without markup and invisible
- * symbols. New lines are stripped and whitespace is collapsed,
- * such that each character would be visible.
- *
- * In browsers that support it, innerText is used.  Other browsers attempt to
- * simulate it via node traversal.  Line breaks are canonicalized in IE.
- *
- * @param {Node} node The node from which we are getting content.
- * @return {string} The text content.
- */
-goog.dom.getTextContent = function(node) {
-  var textContent;
-  // Note(arv): IE9, Opera, and Safari 3 support innerText but they include
-  // text nodes in script tags. So we revert to use a user agent test here.
-  if (goog.dom.BrowserFeature.CAN_USE_INNER_TEXT && node !== null &&
-      ('innerText' in node)) {
-    textContent = goog.string.canonicalizeNewlines(node.innerText);
-    // Unfortunately .innerText() returns text with &shy; symbols
-    // We need to filter it out and then remove duplicate whitespaces
-  } else {
-    var buf = [];
-    goog.dom.getTextContent_(node, buf, true);
-    textContent = buf.join('');
-  }
-
-  // Strip &shy; entities. goog.format.insertWordBreaks inserts them in Opera.
-  textContent = textContent.replace(/ \xAD /g, ' ').replace(/\xAD/g, '');
-  // Strip &#8203; entities. goog.format.insertWordBreaks inserts them in IE8.
-  textContent = textContent.replace(/\u200B/g, '');
-
-  // Skip this replacement on old browsers with working innerText, which
-  // automatically turns &nbsp; into ' ' and / +/ into ' ' when reading
-  // innerText.
-  if (!goog.dom.BrowserFeature.CAN_USE_INNER_TEXT) {
-    textContent = textContent.replace(/ +/g, ' ');
-  }
-  if (textContent != ' ') {
-    textContent = textContent.replace(/^\s*/, '');
-  }
-
-  return textContent;
-};
-
-
-/**
- * Returns the text content of the current node, without markup.
- *
- * Unlike {@code getTextContent} this method does not collapse whitespaces
- * or normalize lines breaks.
- *
- * @param {Node} node The node from which we are getting content.
- * @return {string} The raw text content.
- */
-goog.dom.getRawTextContent = function(node) {
-  var buf = [];
-  goog.dom.getTextContent_(node, buf, false);
-
-  return buf.join('');
-};
-
-
-/**
- * Recursive support function for text content retrieval.
- *
- * @param {Node} node The node from which we are getting content.
- * @param {Array<string>} buf string buffer.
- * @param {boolean} normalizeWhitespace Whether to normalize whitespace.
- * @private
- */
-goog.dom.getTextContent_ = function(node, buf, normalizeWhitespace) {
-  if (node.nodeName in goog.dom.TAGS_TO_IGNORE_) {
-    // ignore certain tags
-  } else if (node.nodeType == goog.dom.NodeType.TEXT) {
-    if (normalizeWhitespace) {
-      buf.push(String(node.nodeValue).replace(/(\r\n|\r|\n)/g, ''));
-    } else {
-      buf.push(node.nodeValue);
-    }
-  } else if (node.nodeName in goog.dom.PREDEFINED_TAG_VALUES_) {
-    buf.push(goog.dom.PREDEFINED_TAG_VALUES_[node.nodeName]);
-  } else {
-    var child = node.firstChild;
-    while (child) {
-      goog.dom.getTextContent_(child, buf, normalizeWhitespace);
-      child = child.nextSibling;
-    }
-  }
-};
-
-
-/**
- * Returns the text length of the text contained in a node, without markup. This
- * is equivalent to the selection length if the node was selected, or the number
- * of cursor movements to traverse the node. Images & BRs take one space.  New
- * lines are ignored.
- *
- * @param {Node} node The node whose text content length is being calculated.
- * @return {number} The length of {@code node}'s text content.
- */
-goog.dom.getNodeTextLength = function(node) {
-  return goog.dom.getTextContent(node).length;
-};
-
-
-/**
- * Returns the text offset of a node relative to one of its ancestors. The text
- * length is the same as the length calculated by goog.dom.getNodeTextLength.
- *
- * @param {Node} node The node whose offset is being calculated.
- * @param {Node=} opt_offsetParent The node relative to which the offset will
- *     be calculated. Defaults to the node's owner document's body.
- * @return {number} The text offset.
- */
-goog.dom.getNodeTextOffset = function(node, opt_offsetParent) {
-  var root = opt_offsetParent || goog.dom.getOwnerDocument(node).body;
-  var buf = [];
-  while (node && node != root) {
-    var cur = node;
-    while ((cur = cur.previousSibling)) {
-      buf.unshift(goog.dom.getTextContent(cur));
-    }
-    node = node.parentNode;
-  }
-  // Trim left to deal with FF cases when there might be line breaks and empty
-  // nodes at the front of the text
-  return goog.string.trimLeft(buf.join('')).replace(/ +/g, ' ').length;
-};
-
-
-/**
- * Returns the node at a given offset in a parent node.  If an object is
- * provided for the optional third parameter, the node and the remainder of the
- * offset will stored as properties of this object.
- * @param {Node} parent The parent node.
- * @param {number} offset The offset into the parent node.
- * @param {Object=} opt_result Object to be used to store the return value. The
- *     return value will be stored in the form {node: Node, remainder: number}
- *     if this object is provided.
- * @return {Node} The node at the given offset.
- */
-goog.dom.getNodeAtOffset = function(parent, offset, opt_result) {
-  var stack = [parent], pos = 0, cur = null;
-  while (stack.length > 0 && pos < offset) {
-    cur = stack.pop();
-    if (cur.nodeName in goog.dom.TAGS_TO_IGNORE_) {
-      // ignore certain tags
-    } else if (cur.nodeType == goog.dom.NodeType.TEXT) {
-      var text = cur.nodeValue.replace(/(\r\n|\r|\n)/g, '').replace(/ +/g, ' ');
-      pos += text.length;
-    } else if (cur.nodeName in goog.dom.PREDEFINED_TAG_VALUES_) {
-      pos += goog.dom.PREDEFINED_TAG_VALUES_[cur.nodeName].length;
-    } else {
-      for (var i = cur.childNodes.length - 1; i >= 0; i--) {
-        stack.push(cur.childNodes[i]);
-      }
-    }
-  }
-  if (goog.isObject(opt_result)) {
-    opt_result.remainder = cur ? cur.nodeValue.length + offset - pos - 1 : 0;
-    opt_result.node = cur;
-  }
-
-  return cur;
-};
-
-
-/**
- * Returns true if the object is a {@code NodeList}.  To qualify as a NodeList,
- * the object must have a numeric length property and an item function (which
- * has type 'string' on IE for some reason).
- * @param {Object} val Object to test.
- * @return {boolean} Whether the object is a NodeList.
- */
-goog.dom.isNodeList = function(val) {
-  // TODO(attila): Now the isNodeList is part of goog.dom we can use
-  // goog.userAgent to make this simpler.
-  // A NodeList must have a length property of type 'number' on all platforms.
-  if (val && typeof val.length == 'number') {
-    // A NodeList is an object everywhere except Safari, where it's a function.
-    if (goog.isObject(val)) {
-      // A NodeList must have an item function (on non-IE platforms) or an item
-      // property of type 'string' (on IE).
-      return typeof val.item == 'function' || typeof val.item == 'string';
-    } else if (goog.isFunction(val)) {
-      // On Safari, a NodeList is a function with an item property that is also
-      // a function.
-      return typeof val.item == 'function';
-    }
-  }
-
-  // Not a NodeList.
-  return false;
-};
-
-
-/**
- * Walks up the DOM hierarchy returning the first ancestor that has the passed
- * tag name and/or class name. If the passed element matches the specified
- * criteria, the element itself is returned.
- * @param {Node} element The DOM node to start with.
- * @param {?(goog.dom.TagName|string)=} opt_tag The tag name to match (or
- *     null/undefined to match only based on class name).
- * @param {?string=} opt_class The class name to match (or null/undefined to
- *     match only based on tag name).
- * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
- *     dom.
- * @return {Element} The first ancestor that matches the passed criteria, or
- *     null if no match is found.
- */
-goog.dom.getAncestorByTagNameAndClass = function(
-    element, opt_tag, opt_class, opt_maxSearchSteps) {
-  if (!opt_tag && !opt_class) {
-    return null;
-  }
-  var tagName = opt_tag ? opt_tag.toUpperCase() : null;
-  return /** @type {Element} */ (goog.dom.getAncestor(element, function(node) {
-    return (!tagName || node.nodeName == tagName) &&
-        (!opt_class ||
-         goog.isString(node.className) &&
-             goog.array.contains(node.className.split(/\s+/), opt_class));
-  }, true, opt_maxSearchSteps));
-};
-
-
-/**
- * Walks up the DOM hierarchy returning the first ancestor that has the passed
- * class name. If the passed element matches the specified criteria, the
- * element itself is returned.
- * @param {Node} element The DOM node to start with.
- * @param {string} className The class name to match.
- * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
- *     dom.
- * @return {Element} The first ancestor that matches the passed criteria, or
- *     null if none match.
- */
-goog.dom.getAncestorByClass = function(element, className, opt_maxSearchSteps) {
-  return goog.dom.getAncestorByTagNameAndClass(
-      element, null, className, opt_maxSearchSteps);
-};
-
-
-/**
- * Walks up the DOM hierarchy returning the first ancestor that passes the
- * matcher function.
- * @param {Node} element The DOM node to start with.
- * @param {function(Node) : boolean} matcher A function that returns true if the
- *     passed node matches the desired criteria.
- * @param {boolean=} opt_includeNode If true, the node itself is included in
- *     the search (the first call to the matcher will pass startElement as
- *     the node to test).
- * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
- *     dom.
- * @return {Node} DOM node that matched the matcher, or null if there was
- *     no match.
- */
-goog.dom.getAncestor = function(
-    element, matcher, opt_includeNode, opt_maxSearchSteps) {
-  if (!opt_includeNode) {
-    element = element.parentNode;
-  }
-  var steps = 0;
-  while (element &&
-         (opt_maxSearchSteps == null || steps <= opt_maxSearchSteps)) {
-    goog.asserts.assert(element.name != 'parentNode');
-    if (matcher(element)) {
-      return element;
-    }
-    element = element.parentNode;
-    steps++;
-  }
-  // Reached the root of the DOM without a match
-  return null;
-};
-
-
-/**
- * Determines the active element in the given document.
- * @param {Document} doc The document to look in.
- * @return {Element} The active element.
- */
-goog.dom.getActiveElement = function(doc) {
-  try {
-    return doc && doc.activeElement;
-  } catch (e) {
-    // NOTE(nicksantos): Sometimes, evaluating document.activeElement in IE
-    // throws an exception. I'm not 100% sure why, but I suspect it chokes
-    // on document.activeElement if the activeElement has been recently
-    // removed from the DOM by a JS operation.
-    //
-    // We assume that an exception here simply means
-    // "there is no active element."
-  }
-
-  return null;
-};
-
-
-/**
- * Gives the current devicePixelRatio.
- *
- * By default, this is the value of window.devicePixelRatio (which should be
- * preferred if present).
- *
- * If window.devicePixelRatio is not present, the ratio is calculated with
- * window.matchMedia, if present. Otherwise, gives 1.0.
- *
- * Some browsers (including Chrome) consider the browser zoom level in the pixel
- * ratio, so the value may change across multiple calls.
- *
- * @return {number} The number of actual pixels per virtual pixel.
- */
-goog.dom.getPixelRatio = function() {
-  var win = goog.dom.getWindow();
-  if (goog.isDef(win.devicePixelRatio)) {
-    return win.devicePixelRatio;
-  } else if (win.matchMedia) {
-    return goog.dom.matchesPixelRatio_(.75) ||
-        goog.dom.matchesPixelRatio_(1.5) || goog.dom.matchesPixelRatio_(2) ||
-        goog.dom.matchesPixelRatio_(3) || 1;
-  }
-  return 1;
-};
-
-
-/**
- * Calculates a mediaQuery to check if the current device supports the
- * given actual to virtual pixel ratio.
- * @param {number} pixelRatio The ratio of actual pixels to virtual pixels.
- * @return {number} pixelRatio if applicable, otherwise 0.
- * @private
- */
-goog.dom.matchesPixelRatio_ = function(pixelRatio) {
-  var win = goog.dom.getWindow();
-  var query =
-      ('(-webkit-min-device-pixel-ratio: ' + pixelRatio + '),' +
-       '(min--moz-device-pixel-ratio: ' + pixelRatio + '),' +
-       '(min-resolution: ' + pixelRatio + 'dppx)');
-  return win.matchMedia(query).matches ? pixelRatio : 0;
-};
-
-
-
-/**
- * Create an instance of a DOM helper with a new document object.
- * @param {Document=} opt_document Document object to associate with this
- *     DOM helper.
- * @constructor
- */
-goog.dom.DomHelper = function(opt_document) {
-  /**
-   * Reference to the document object to use
-   * @type {!Document}
-   * @private
-   */
-  this.document_ = opt_document || goog.global.document || document;
-};
-
-
-/**
- * Gets the dom helper object for the document where the element resides.
- * @param {Node=} opt_node If present, gets the DomHelper for this node.
- * @return {!goog.dom.DomHelper} The DomHelper.
- */
-goog.dom.DomHelper.prototype.getDomHelper = goog.dom.getDomHelper;
-
-
-/**
- * Sets the document object.
- * @param {!Document} document Document object.
- */
-goog.dom.DomHelper.prototype.setDocument = function(document) {
-  this.document_ = document;
-};
-
-
-/**
- * Gets the document object being used by the dom library.
- * @return {!Document} Document object.
- */
-goog.dom.DomHelper.prototype.getDocument = function() {
-  return this.document_;
-};
-
-
-/**
- * Alias for {@code getElementById}. If a DOM node is passed in then we just
- * return that.
- * @param {string|Element} element Element ID or a DOM node.
- * @return {Element} The element with the given ID, or the node passed in.
- */
-goog.dom.DomHelper.prototype.getElement = function(element) {
-  return goog.dom.getElementHelper_(this.document_, element);
-};
-
-
-/**
- * Gets an element by id, asserting that the element is found.
- *
- * This is used when an element is expected to exist, and should fail with
- * an assertion error if it does not (if assertions are enabled).
- *
- * @param {string} id Element ID.
- * @return {!Element} The element with the given ID, if it exists.
- */
-goog.dom.DomHelper.prototype.getRequiredElement = function(id) {
-  return goog.dom.getRequiredElementHelper_(this.document_, id);
-};
-
-
-/**
- * Alias for {@code getElement}.
- * @param {string|Element} element Element ID or a DOM node.
- * @return {Element} The element with the given ID, or the node passed in.
- * @deprecated Use {@link goog.dom.DomHelper.prototype.getElement} instead.
- */
-goog.dom.DomHelper.prototype.$ = goog.dom.DomHelper.prototype.getElement;
-
-
-/**
- * Looks up elements by both tag and class name, using browser native functions
- * ({@code querySelectorAll}, {@code getElementsByTagName} or
- * {@code getElementsByClassName}) where possible. The returned array is a live
- * NodeList or a static list depending on the code path taken.
- *
- * @see goog.dom.query
- *
- * @param {?string=} opt_tag Element tag name or * for all tags.
- * @param {?string=} opt_class Optional class name.
- * @param {(Document|Element)=} opt_el Optional element to look in.
- * @return {!IArrayLike<!Element>} Array-like list of elements (only a length
- *     property and numerical indices are guaranteed to exist).
- */
-goog.dom.DomHelper.prototype.getElementsByTagNameAndClass = function(
-    opt_tag, opt_class, opt_el) {
-  return goog.dom.getElementsByTagNameAndClass_(
-      this.document_, opt_tag, opt_class, opt_el);
-};
-
-
-/**
- * Returns an array of all the elements with the provided className.
- * @see {goog.dom.query}
- * @param {string} className the name of the class to look for.
- * @param {Element|Document=} opt_el Optional element to look in.
- * @return {!IArrayLike<!Element>} The items found with the class name provided.
- */
-goog.dom.DomHelper.prototype.getElementsByClass = function(className, opt_el) {
-  var doc = opt_el || this.document_;
-  return goog.dom.getElementsByClass(className, doc);
-};
-
-
-/**
- * Returns the first element we find matching the provided class name.
- * @see {goog.dom.query}
- * @param {string} className the name of the class to look for.
- * @param {(Element|Document)=} opt_el Optional element to look in.
- * @return {Element} The first item found with the class name provided.
- */
-goog.dom.DomHelper.prototype.getElementByClass = function(className, opt_el) {
-  var doc = opt_el || this.document_;
-  return goog.dom.getElementByClass(className, doc);
-};
-
-
-/**
- * Ensures an element with the given className exists, and then returns the
- * first element with the provided className.
- * @see {goog.dom.query}
- * @param {string} className the name of the class to look for.
- * @param {(!Element|!Document)=} opt_root Optional element or document to look
- *     in.
- * @return {!Element} The first item found with the class name provided.
- * @throws {goog.asserts.AssertionError} Thrown if no element is found.
- */
-goog.dom.DomHelper.prototype.getRequiredElementByClass = function(
-    className, opt_root) {
-  var root = opt_root || this.document_;
-  return goog.dom.getRequiredElementByClass(className, root);
-};
-
-
-/**
- * Alias for {@code getElementsByTagNameAndClass}.
- * @deprecated Use DomHelper getElementsByTagNameAndClass.
- * @see goog.dom.query
- *
- * @param {?string=} opt_tag Element tag name.
- * @param {?string=} opt_class Optional class name.
- * @param {Element=} opt_el Optional element to look in.
- * @return {!IArrayLike<!Element>} Array-like list of elements (only a length
- *     property and numerical indices are guaranteed to exist).
- */
-goog.dom.DomHelper.prototype.$$ =
-    goog.dom.DomHelper.prototype.getElementsByTagNameAndClass;
-
-
-/**
- * Sets a number of properties on a node.
- * @param {Element} element DOM node to set properties on.
- * @param {Object} properties Hash of property:value pairs.
- */
-goog.dom.DomHelper.prototype.setProperties = goog.dom.setProperties;
-
-
-/**
- * Gets the dimensions of the viewport.
- * @param {Window=} opt_window Optional window element to test. Defaults to
- *     the window of the Dom Helper.
- * @return {!goog.math.Size} Object with values 'width' and 'height'.
- */
-goog.dom.DomHelper.prototype.getViewportSize = function(opt_window) {
-  // TODO(arv): This should not take an argument. That breaks the rule of a
-  // a DomHelper representing a single frame/window/document.
-  return goog.dom.getViewportSize(opt_window || this.getWindow());
-};
-
-
-/**
- * Calculates the height of the document.
- *
- * @return {number} The height of the document.
- */
-goog.dom.DomHelper.prototype.getDocumentHeight = function() {
-  return goog.dom.getDocumentHeight_(this.getWindow());
-};
-
-
-/**
- * Typedef for use with goog.dom.createDom and goog.dom.append.
- * @typedef {Object|string|Array|NodeList}
- */
-goog.dom.Appendable;
-
-
-/**
- * Returns a dom node with a set of attributes.  This function accepts varargs
- * for subsequent nodes to be added.  Subsequent nodes will be added to the
- * first node as childNodes.
- *
- * So:
- * <code>createDom('div', null, createDom('p'), createDom('p'));</code>
- * would return a div with two child paragraphs
- *
- * An easy way to move all child nodes of an existing element to a new parent
- * element is:
- * <code>createDom('div', null, oldElement.childNodes);</code>
- * which will remove all child nodes from the old element and add them as
- * child nodes of the new DIV.
- *
- * @param {string} tagName Tag to create.
- * @param {Object|string=} opt_attributes If object, then a map of name-value
- *     pairs for attributes. If a string, then this is the className of the new
- *     element.
- * @param {...goog.dom.Appendable} var_args Further DOM nodes or
- *     strings for text nodes. If one of the var_args is an array or
- *     NodeList, its elements will be added as childNodes instead.
- * @return {!Element} Reference to a DOM node.
- */
-goog.dom.DomHelper.prototype.createDom = function(
-    tagName, opt_attributes, var_args) {
-  return goog.dom.createDom_(this.document_, arguments);
-};
-
-
-/**
- * Alias for {@code createDom}.
- * @param {string} tagName Tag to create.
- * @param {(Object|string)=} opt_attributes If object, then a map of name-value
- *     pairs for attributes. If a string, then this is the className of the new
- *     element.
- * @param {...goog.dom.Appendable} var_args Further DOM nodes or strings for
- *     text nodes.  If one of the var_args is an array, its children will be
- *     added as childNodes instead.
- * @return {!Element} Reference to a DOM node.
- * @deprecated Use {@link goog.dom.DomHelper.prototype.createDom} instead.
- */
-goog.dom.DomHelper.prototype.$dom = goog.dom.DomHelper.prototype.createDom;
-
-
-/**
- * Creates a new element.
- * @param {string} name Tag name.
- * @return {!Element} The new element.
- */
-goog.dom.DomHelper.prototype.createElement = function(name) {
-  return this.document_.createElement(name);
-};
-
-
-/**
- * Creates a new text node.
- * @param {number|string} content Content.
- * @return {!Text} The new text node.
- */
-goog.dom.DomHelper.prototype.createTextNode = function(content) {
-  return this.document_.createTextNode(String(content));
-};
-
-
-/**
- * Create a table.
- * @param {number} rows The number of rows in the table.  Must be >= 1.
- * @param {number} columns The number of columns in the table.  Must be >= 1.
- * @param {boolean=} opt_fillWithNbsp If true, fills table entries with
- *     {@code goog.string.Unicode.NBSP} characters.
- * @return {!HTMLElement} The created table.
- */
-goog.dom.DomHelper.prototype.createTable = function(
-    rows, columns, opt_fillWithNbsp) {
-  return goog.dom.createTable_(
-      this.document_, rows, columns, !!opt_fillWithNbsp);
-};
-
-
-/**
- * Converts an HTML into a node or a document fragment. A single Node is used if
- * {@code html} only generates a single node. If {@code html} generates multiple
- * nodes then these are put inside a {@code DocumentFragment}. This is a safe
- * version of {@code goog.dom.DomHelper#htmlToDocumentFragment} which is now
- * deleted.
- * @param {!goog.html.SafeHtml} html The HTML markup to convert.
- * @return {!Node} The resulting node.
- */
-goog.dom.DomHelper.prototype.safeHtmlToNode = function(html) {
-  return goog.dom.safeHtmlToNode_(this.document_, html);
-};
-
-
-/**
- * Returns true if the browser is in "CSS1-compatible" (standards-compliant)
- * mode, false otherwise.
- * @return {boolean} True if in CSS1-compatible mode.
- */
-goog.dom.DomHelper.prototype.isCss1CompatMode = function() {
-  return goog.dom.isCss1CompatMode_(this.document_);
-};
-
-
-/**
- * Gets the window object associated with the document.
- * @return {!Window} The window associated with the given document.
- */
-goog.dom.DomHelper.prototype.getWindow = function() {
-  return goog.dom.getWindow_(this.document_);
-};
-
-
-/**
- * Gets the document scroll element.
- * @return {!Element} Scrolling element.
- */
-goog.dom.DomHelper.prototype.getDocumentScrollElement = function() {
-  return goog.dom.getDocumentScrollElement_(this.document_);
-};
-
-
-/**
- * Gets the document scroll distance as a coordinate object.
- * @return {!goog.math.Coordinate} Object with properties 'x' and 'y'.
- */
-goog.dom.DomHelper.prototype.getDocumentScroll = function() {
-  return goog.dom.getDocumentScroll_(this.document_);
-};
-
-
-/**
- * Determines the active element in the given document.
- * @param {Document=} opt_doc The document to look in.
- * @return {Element} The active element.
- */
-goog.dom.DomHelper.prototype.getActiveElement = function(opt_doc) {
-  return goog.dom.getActiveElement(opt_doc || this.document_);
-};
-
-
-/**
- * Appends a child to a node.
- * @param {Node} parent Parent.
- * @param {Node} child Child.
- */
-goog.dom.DomHelper.prototype.appendChild = goog.dom.appendChild;
-
-
-/**
- * Appends a node with text or other nodes.
- * @param {!Node} parent The node to append nodes to.
- * @param {...goog.dom.Appendable} var_args The things to append to the node.
- *     If this is a Node it is appended as is.
- *     If this is a string then a text node is appended.
- *     If this is an array like object then fields 0 to length - 1 are appended.
- */
-goog.dom.DomHelper.prototype.append = goog.dom.append;
-
-
-/**
- * Determines if the given node can contain children, intended to be used for
- * HTML generation.
- *
- * @param {Node} node The node to check.
- * @return {boolean} Whether the node can contain children.
- */
-goog.dom.DomHelper.prototype.canHaveChildren = goog.dom.canHaveChildren;
-
-
-/**
- * Removes all the child nodes on a DOM node.
- * @param {Node} node Node to remove children from.
- */
-goog.dom.DomHelper.prototype.removeChildren = goog.dom.removeChildren;
-
-
-/**
- * Inserts a new node before an existing reference node (i.e., as the previous
- * sibling). If the reference node has no parent, then does nothing.
- * @param {Node} newNode Node to insert.
- * @param {Node} refNode Reference node to insert before.
- */
-goog.dom.DomHelper.prototype.insertSiblingBefore = goog.dom.insertSiblingBefore;
-
-
-/**
- * Inserts a new node after an existing reference node (i.e., as the next
- * sibling). If the reference node has no parent, then does nothing.
- * @param {Node} newNode Node to insert.
- * @param {Node} refNode Reference node to insert after.
- */
-goog.dom.DomHelper.prototype.insertSiblingAfter = goog.dom.insertSiblingAfter;
-
-
-/**
- * Insert a child at a given index. If index is larger than the number of child
- * nodes that the parent currently has, the node is inserted as the last child
- * node.
- * @param {Element} parent The element into which to insert the child.
- * @param {Node} child The element to insert.
- * @param {number} index The index at which to insert the new child node. Must
- *     not be negative.
- */
-goog.dom.DomHelper.prototype.insertChildAt = goog.dom.insertChildAt;
-
-
-/**
- * Removes a node from its parent.
- * @param {Node} node The node to remove.
- * @return {Node} The node removed if removed; else, null.
- */
-goog.dom.DomHelper.prototype.removeNode = goog.dom.removeNode;
-
-
-/**
- * Replaces a node in the DOM tree. Will do nothing if {@code oldNode} has no
- * parent.
- * @param {Node} newNode Node to insert.
- * @param {Node} oldNode Node to replace.
- */
-goog.dom.DomHelper.prototype.replaceNode = goog.dom.replaceNode;
-
-
-/**
- * Flattens an element. That is, removes it and replace it with its children.
- * @param {Element} element The element to flatten.
- * @return {Element|undefined} The original element, detached from the document
- *     tree, sans children, or undefined if the element was already not in the
- *     document.
- */
-goog.dom.DomHelper.prototype.flattenElement = goog.dom.flattenElement;
-
-
-/**
- * Returns an array containing just the element children of the given element.
- * @param {Element} element The element whose element children we want.
- * @return {!(Array<!Element>|NodeList<!Element>)} An array or array-like list
- *     of just the element children of the given element.
- */
-goog.dom.DomHelper.prototype.getChildren = goog.dom.getChildren;
-
-
-/**
- * Returns the first child node that is an element.
- * @param {Node} node The node to get the first child element of.
- * @return {Element} The first child node of {@code node} that is an element.
- */
-goog.dom.DomHelper.prototype.getFirstElementChild =
-    goog.dom.getFirstElementChild;
-
-
-/**
- * Returns the last child node that is an element.
- * @param {Node} node The node to get the last child element of.
- * @return {Element} The last child node of {@code node} that is an element.
- */
-goog.dom.DomHelper.prototype.getLastElementChild = goog.dom.getLastElementChild;
-
-
-/**
- * Returns the first next sibling that is an element.
- * @param {Node} node The node to get the next sibling element of.
- * @return {Element} The next sibling of {@code node} that is an element.
- */
-goog.dom.DomHelper.prototype.getNextElementSibling =
-    goog.dom.getNextElementSibling;
-
-
-/**
- * Returns the first previous sibling that is an element.
- * @param {Node} node The node to get the previous sibling element of.
- * @return {Element} The first previous sibling of {@code node} that is
- *     an element.
- */
-goog.dom.DomHelper.prototype.getPreviousElementSibling =
-    goog.dom.getPreviousElementSibling;
-
-
-/**
- * Returns the next node in source order from the given node.
- * @param {Node} node The node.
- * @return {Node} The next node in the DOM tree, or null if this was the last
- *     node.
- */
-goog.dom.DomHelper.prototype.getNextNode = goog.dom.getNextNode;
-
-
-/**
- * Returns the previous node in source order from the given node.
- * @param {Node} node The node.
- * @return {Node} The previous node in the DOM tree, or null if this was the
- *     first node.
- */
-goog.dom.DomHelper.prototype.getPreviousNode = goog.dom.getPreviousNode;
-
-
-/**
- * Whether the object looks like a DOM node.
- * @param {?} obj The object being tested for node likeness.
- * @return {boolean} Whether the object looks like a DOM node.
- */
-goog.dom.DomHelper.prototype.isNodeLike = goog.dom.isNodeLike;
-
-
-/**
- * Whether the object looks like an Element.
- * @param {?} obj The object being tested for Element likeness.
- * @return {boolean} Whether the object looks like an Element.
- */
-goog.dom.DomHelper.prototype.isElement = goog.dom.isElement;
-
-
-/**
- * Returns true if the specified value is a Window object. This includes the
- * global window for HTML pages, and iframe windows.
- * @param {?} obj Variable to test.
- * @return {boolean} Whether the variable is a window.
- */
-goog.dom.DomHelper.prototype.isWindow = goog.dom.isWindow;
-
-
-/**
- * Returns an element's parent, if it's an Element.
- * @param {Element} element The DOM element.
- * @return {Element} The parent, or null if not an Element.
- */
-goog.dom.DomHelper.prototype.getParentElement = goog.dom.getParentElement;
-
-
-/**
- * Whether a node contains another node.
- * @param {Node} parent The node that should contain the other node.
- * @param {Node} descendant The node to test presence of.
- * @return {boolean} Whether the parent node contains the descendent node.
- */
-goog.dom.DomHelper.prototype.contains = goog.dom.contains;
-
-
-/**
- * Compares the document order of two nodes, returning 0 if they are the same
- * node, a negative number if node1 is before node2, and a positive number if
- * node2 is before node1.  Note that we compare the order the tags appear in the
- * document so in the tree <b><i>text</i></b> the B node is considered to be
- * before the I node.
- *
- * @param {Node} node1 The first node to compare.
- * @param {Node} node2 The second node to compare.
- * @return {number} 0 if the nodes are the same node, a negative number if node1
- *     is before node2, and a positive number if node2 is before node1.
- */
-goog.dom.DomHelper.prototype.compareNodeOrder = goog.dom.compareNodeOrder;
-
-
-/**
- * Find the deepest common ancestor of the given nodes.
- * @param {...Node} var_args The nodes to find a common ancestor of.
- * @return {Node} The common ancestor of the nodes, or null if there is none.
- *     null will only be returned if two or more of the nodes are from different
- *     documents.
- */
-goog.dom.DomHelper.prototype.findCommonAncestor = goog.dom.findCommonAncestor;
-
-
-/**
- * Returns the owner document for a node.
- * @param {Node} node The node to get the document for.
- * @return {!Document} The document owning the node.
- */
-goog.dom.DomHelper.prototype.getOwnerDocument = goog.dom.getOwnerDocument;
-
-
-/**
- * Cross browser function for getting the document element of an iframe.
- * @param {Element} iframe Iframe element.
- * @return {!Document} The frame content document.
- */
-goog.dom.DomHelper.prototype.getFrameContentDocument =
-    goog.dom.getFrameContentDocument;
-
-
-/**
- * Cross browser function for getting the window of a frame or iframe.
- * @param {Element} frame Frame element.
- * @return {Window} The window associated with the given frame.
- */
-goog.dom.DomHelper.prototype.getFrameContentWindow =
-    goog.dom.getFrameContentWindow;
-
-
-/**
- * Sets the text content of a node, with cross-browser support.
- * @param {Node} node The node to change the text content of.
- * @param {string|number} text The value that should replace the node's content.
- */
-goog.dom.DomHelper.prototype.setTextContent = goog.dom.setTextContent;
-
-
-/**
- * Gets the outerHTML of a node, which islike innerHTML, except that it
- * actually contains the HTML of the node itself.
- * @param {Element} element The element to get the HTML of.
- * @return {string} The outerHTML of the given element.
- */
-goog.dom.DomHelper.prototype.getOuterHtml = goog.dom.getOuterHtml;
-
-
-/**
- * Finds the first descendant node that matches the filter function. This does
- * a depth first search.
- * @param {Node} root The root of the tree to search.
- * @param {function(Node) : boolean} p The filter function.
- * @return {Node|undefined} The found node or undefined if none is found.
- */
-goog.dom.DomHelper.prototype.findNode = goog.dom.findNode;
-
-
-/**
- * Finds all the descendant nodes that matches the filter function. This does a
- * depth first search.
- * @param {Node} root The root of the tree to search.
- * @param {function(Node) : boolean} p The filter function.
- * @return {Array<Node>} The found nodes or an empty array if none are found.
- */
-goog.dom.DomHelper.prototype.findNodes = goog.dom.findNodes;
-
-
-/**
- * Returns true if the element has a tab index that allows it to receive
- * keyboard focus (tabIndex >= 0), false otherwise.  Note that some elements
- * natively support keyboard focus, even if they have no tab index.
- * @param {!Element} element Element to check.
- * @return {boolean} Whether the element has a tab index that allows keyboard
- *     focus.
- */
-goog.dom.DomHelper.prototype.isFocusableTabIndex = goog.dom.isFocusableTabIndex;
-
-
-/**
- * Enables or disables keyboard focus support on the element via its tab index.
- * Only elements for which {@link goog.dom.isFocusableTabIndex} returns true
- * (or elements that natively support keyboard focus, like form elements) can
- * receive keyboard focus.  See http://go/tabindex for more info.
- * @param {Element} element Element whose tab index is to be changed.
- * @param {boolean} enable Whether to set or remove a tab index on the element
- *     that supports keyboard focus.
- */
-goog.dom.DomHelper.prototype.setFocusableTabIndex =
-    goog.dom.setFocusableTabIndex;
-
-
-/**
- * Returns true if the element can be focused, i.e. it has a tab index that
- * allows it to receive keyboard focus (tabIndex >= 0), or it is an element
- * that natively supports keyboard focus.
- * @param {!Element} element Element to check.
- * @return {boolean} Whether the element allows keyboard focus.
- */
-goog.dom.DomHelper.prototype.isFocusable = goog.dom.isFocusable;
-
-
-/**
- * Returns the text contents of the current node, without markup. New lines are
- * stripped and whitespace is collapsed, such that each character would be
- * visible.
- *
- * In browsers that support it, innerText is used.  Other browsers attempt to
- * simulate it via node traversal.  Line breaks are canonicalized in IE.
- *
- * @param {Node} node The node from which we are getting content.
- * @return {string} The text content.
- */
-goog.dom.DomHelper.prototype.getTextContent = goog.dom.getTextContent;
-
-
-/**
- * Returns the text length of the text contained in a node, without markup. This
- * is equivalent to the selection length if the node was selected, or the number
- * of cursor movements to traverse the node. Images & BRs take one space.  New
- * lines are ignored.
- *
- * @param {Node} node The node whose text content length is being calculated.
- * @return {number} The length of {@code node}'s text content.
- */
-goog.dom.DomHelper.prototype.getNodeTextLength = goog.dom.getNodeTextLength;
-
-
-/**
- * Returns the text offset of a node relative to one of its ancestors. The text
- * length is the same as the length calculated by
- * {@code goog.dom.getNodeTextLength}.
- *
- * @param {Node} node The node whose offset is being calculated.
- * @param {Node=} opt_offsetParent Defaults to the node's owner document's body.
- * @return {number} The text offset.
- */
-goog.dom.DomHelper.prototype.getNodeTextOffset = goog.dom.getNodeTextOffset;
-
-
-/**
- * Returns the node at a given offset in a parent node.  If an object is
- * provided for the optional third parameter, the node and the remainder of the
- * offset will stored as properties of this object.
- * @param {Node} parent The parent node.
- * @param {number} offset The offset into the parent node.
- * @param {Object=} opt_result Object to be used to store the return value. The
- *     return value will be stored in the form {node: Node, remainder: number}
- *     if this object is provided.
- * @return {Node} The node at the given offset.
- */
-goog.dom.DomHelper.prototype.getNodeAtOffset = goog.dom.getNodeAtOffset;
-
-
-/**
- * Returns true if the object is a {@code NodeList}.  To qualify as a NodeList,
- * the object must have a numeric length property and an item function (which
- * has type 'string' on IE for some reason).
- * @param {Object} val Object to test.
- * @return {boolean} Whether the object is a NodeList.
- */
-goog.dom.DomHelper.prototype.isNodeList = goog.dom.isNodeList;
-
-
-/**
- * Walks up the DOM hierarchy returning the first ancestor that has the passed
- * tag name and/or class name. If the passed element matches the specified
- * criteria, the element itself is returned.
- * @param {Node} element The DOM node to start with.
- * @param {?(goog.dom.TagName|string)=} opt_tag The tag name to match (or
- *     null/undefined to match only based on class name).
- * @param {?string=} opt_class The class name to match (or null/undefined to
- *     match only based on tag name).
- * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
- *     dom.
- * @return {Element} The first ancestor that matches the passed criteria, or
- *     null if no match is found.
- */
-goog.dom.DomHelper.prototype.getAncestorByTagNameAndClass =
-    goog.dom.getAncestorByTagNameAndClass;
-
-
-/**
- * Walks up the DOM hierarchy returning the first ancestor that has the passed
- * class name. If the passed element matches the specified criteria, the
- * element itself is returned.
- * @param {Node} element The DOM node to start with.
- * @param {string} class The class name to match.
- * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
- *     dom.
- * @return {Element} The first ancestor that matches the passed criteria, or
- *     null if none match.
- */
-goog.dom.DomHelper.prototype.getAncestorByClass = goog.dom.getAncestorByClass;
-
-
-/**
- * Walks up the DOM hierarchy returning the first ancestor that passes the
- * matcher function.
- * @param {Node} element The DOM node to start with.
- * @param {function(Node) : boolean} matcher A function that returns true if the
- *     passed node matches the desired criteria.
- * @param {boolean=} opt_includeNode If true, the node itself is included in
- *     the search (the first call to the matcher will pass startElement as
- *     the node to test).
- * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
- *     dom.
- * @return {Node} DOM node that matched the matcher, or null if there was
- *     no match.
- */
-goog.dom.DomHelper.prototype.getAncestor = goog.dom.getAncestor;