text: /*
   * Copyright (C) 2007 Apple Inc.  All rights reserved.
   * Copyright (C) 2009 Joseph Pecoraro
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1.  Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   * 2.  Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
   *     its contributors may be used to endorse or promote products derived
   *     from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /**
   * @constructor
   * @extends {WebInspector.ElementsSidebarPane}
   * @param {!WebInspector.ComputedStyleSidebarPane} computedStylePane
   * @param {function()} requestShowCallback
   */
  WebInspector.StylesSidebarPane = function(computedStylePane, requestShowCallback)
  {
      WebInspector.ElementsSidebarPane.call(this, WebInspector.UIString("Styles"));
  
      this._computedStylePane = computedStylePane;
      computedStylePane.setHostingPane(this);
      this.element.addEventListener("contextmenu", this._contextMenuEventFired.bind(this), true);
      WebInspector.moduleSetting("colorFormat").addChangeListener(this._colorFormatSettingChanged.bind(this));
  
      var toolbar = new WebInspector.Toolbar(this.titleElement);
      toolbar.element.classList.add("styles-pane-toolbar");
      toolbar.makeNarrow();
  
      var addNewStyleRuleButton = new WebInspector.ToolbarButton(WebInspector.UIString("New Style Rule"), "add-toolbar-item");
      addNewStyleRuleButton.makeLongClickEnabled();
      addNewStyleRuleButton.addEventListener("click", this._createNewRuleInViaInspectorStyleSheet, this);
      addNewStyleRuleButton.addEventListener("longClickDown", this._onAddButtonLongClick, this);
      toolbar.appendToolbarItem(addNewStyleRuleButton);
  
      this._elementStateButton = new WebInspector.ToolbarButton(WebInspector.UIString("Toggle Element State"), "element-state-toolbar-item");
      this._elementStateButton.addEventListener("click", this._toggleElementStatePane, this);
      toolbar.appendToolbarItem(this._elementStateButton);
  
      this._animationsControlButton = new WebInspector.ToolbarButton(WebInspector.UIString("Animations Controls"), "animation-toolbar-item");
      this._animationsControlButton.addEventListener("click", this._toggleAnimationsControlPane, this);
      toolbar.appendToolbarItem(this._animationsControlButton);
  
      this._requestShowCallback = requestShowCallback;
  
      this._createElementStatePane();
      this.bodyElement.appendChild(this._elementStatePane);
      this._animationsControlPane = new WebInspector.AnimationControlPane();
      this.bodyElement.appendChild(this._animationsControlPane.element);
      this._sectionsContainer = createElement("div");
      this.bodyElement.appendChild(this._sectionsContainer);
  
      this._stylesPopoverHelper = new WebInspector.StylesPopoverHelper();
  
      this._linkifier = new WebInspector.Linkifier(new WebInspector.Linkifier.DefaultCSSFormatter());
  
      this.element.classList.add("styles-pane");
      this.element.addEventListener("mousemove", this._mouseMovedOverElement.bind(this), false);
      this._keyDownBound = this._keyDown.bind(this);
      this._keyUpBound = this._keyUp.bind(this);
  }
  
  // Keep in sync with ComputedStyleConstants.h PseudoId enum. Array below contains pseudo id names for corresponding enum indexes.
  // First item is empty due to its artificial NOPSEUDO nature in the enum.
  // FIXME: find a way of generating this mapping or getting it from combination of ComputedStyleConstants and CSSSelector.cpp at
  // runtime.
  WebInspector.StylesSidebarPane.PseudoIdNames = [
      "", "first-line", "first-letter", "before", "after", "backdrop", "selection", "", "-webkit-scrollbar",
      "-webkit-scrollbar-thumb", "-webkit-scrollbar-button", "-webkit-scrollbar-track", "-webkit-scrollbar-track-piece",
      "-webkit-scrollbar-corner", "-webkit-resizer"
  ];
  
  /**
   * @enum {string}
   */
  WebInspector.StylesSidebarPane.Events = {
      SelectorEditingStarted: "SelectorEditingStarted",
      SelectorEditingEnded: "SelectorEditingEnded"
  };
  
  /**
   * @param {!WebInspector.CSSProperty} property
   * @return {!Element}
   */
  WebInspector.StylesSidebarPane.createExclamationMark = function(property)
  {
      var exclamationElement = createElement("label", "dt-icon-label");
      exclamationElement.className = "exclamation-mark";
      if (!WebInspector.StylesSidebarPane.ignoreErrorsForProperty(property))
          exclamationElement.type = "warning-icon";
      exclamationElement.title = WebInspector.CSSMetadata.cssPropertiesMetainfo.keySet()[property.name.toLowerCase()] ? WebInspector.UIString("Invalid property value.") : WebInspector.UIString("Unknown property name.");
      return exclamationElement;
  }
  
  /**
   * @param {!WebInspector.CSSProperty} property
   * @return {boolean}
   */
  WebInspector.StylesSidebarPane.ignoreErrorsForProperty = function(property) {
      /**
       * @param {string} string
       */
      function hasUnknownVendorPrefix(string)
      {
          return !string.startsWith("-webkit-") && /^[-_][\w\d]+-\w/.test(string);
      }
  
      var name = property.name.toLowerCase();
  
      // IE hack.
      if (name.charAt(0) === "_")
          return true;
  
      // IE has a different format for this.
      if (name === "filter")
          return true;
  
      // Common IE-specific property prefix.
      if (name.startsWith("scrollbar-"))
          return true;
      if (hasUnknownVendorPrefix(name))
          return true;
  
      var value = property.value.toLowerCase();
  
      // IE hack.
      if (value.endsWith("\9"))
          return true;
      if (hasUnknownVendorPrefix(value))
          return true;
  
      return false;
  }
  
  WebInspector.StylesSidebarPane.prototype = {
      /**
       * @param {!WebInspector.Event} event
       */
      _onAddButtonLongClick: function(event)
      {
          var cssModel = this._cssModel;
          var headers = cssModel.styleSheetHeaders().filter(styleSheetResourceHeader);
  
          /** @type {!Array.<{text: string, handler: function()}>} */
          var contextMenuDescriptors = [];
          for (var i = 0; i < headers.length; ++i) {
              var header = headers[i];
              var handler = this._createNewRuleInStyleSheet.bind(this, header);
              contextMenuDescriptors.push({
                  text: WebInspector.displayNameForURL(header.resourceURL()),
                  handler: handler
              });
          }
  
          contextMenuDescriptors.sort(compareDescriptors);
  
          var contextMenu = new WebInspector.ContextMenu(/** @type {!Event} */(event.data));
          for (var i = 0; i < contextMenuDescriptors.length; ++i) {
              var descriptor = contextMenuDescriptors[i];
              contextMenu.appendItem(descriptor.text, descriptor.handler);
          }
          if (!contextMenu.isEmpty())
              contextMenu.appendSeparator();
          contextMenu.appendItem("inspector-stylesheet", this._createNewRuleInViaInspectorStyleSheet.bind(this));
          contextMenu.show();
  
          /**
           * @param {!{text: string, handler: function()}} descriptor1
           * @param {!{text: string, handler: function()}} descriptor2
           * @return {number}
           */
          function compareDescriptors(descriptor1, descriptor2)
          {
              return String.naturalOrderComparator(descriptor1.text, descriptor2.text);
          }
  
          /**
           * @param {!WebInspector.CSSStyleSheetHeader} header
           * @return {boolean}
           */
          function styleSheetResourceHeader(header)
          {
              return !header.isViaInspector() && !header.isInline && !!header.resourceURL();
          }
      },
  
      /**
       * @param {!WebInspector.DOMNode} node
       */
      updateEditingSelectorForNode: function(node)
      {
          var selectorText = WebInspector.DOMPresentationUtils.simpleSelector(node);
          if (!selectorText)
              return;
          this._editingSelectorSection.setSelectorText(selectorText);
      },
  
      /**
       * @return {boolean}
       */
      isEditingSelector: function()
      {
          return !!this._editingSelectorSection;
      },
  
      /**
       * @param {!WebInspector.StylePropertiesSection} section
       */
      _startEditingSelector: function(section)
      {
          this._editingSelectorSection = section;
          this.dispatchEventToListeners(WebInspector.StylesSidebarPane.Events.SelectorEditingStarted);
      },
  
      _finishEditingSelector: function()
      {
          delete this._editingSelectorSection;
          this.dispatchEventToListeners(WebInspector.StylesSidebarPane.Events.SelectorEditingEnded);
      },
  
      /**
       * @param {!WebInspector.CSSRule} editedRule
       * @param {!WebInspector.TextRange} oldRange
       * @param {!WebInspector.TextRange} newRange
       */
      _styleSheetRuleEdited: function(editedRule, oldRange, newRange)
      {
          if (!editedRule.styleSheetId)
              return;
          for (var block of this._sectionBlocks) {
              for (var section of block.sections)
                  section._styleSheetRuleEdited(editedRule, oldRange, newRange);
          }
      },
  
      /**
       * @param {!WebInspector.CSSMedia} oldMedia
       * @param {!WebInspector.CSSMedia}  newMedia
       */
      _styleSheetMediaEdited: function(oldMedia, newMedia)
      {
          if (!oldMedia.parentStyleSheetId)
              return;
          for (var block of this._sectionBlocks) {
              for (var section of block.sections)
                  section._styleSheetMediaEdited(oldMedia, newMedia);
          }
      },
  
      /**
       * @param {!Event} event
       */
      _contextMenuEventFired: function(event)
      {
          // We start editing upon click -> default navigation to resources panel is not available
          // Hence we add a soft context menu for hrefs.
          var contextMenu = new WebInspector.ContextMenu(event);
          contextMenu.appendApplicableItems(/** @type {!Node} */ (event.target));
          contextMenu.show();
      },
  
      /**
       * @param {!Element} matchedStylesElement
       */
      setFilterBoxContainer: function(matchedStylesElement)
      {
          this._filterInput = WebInspector.StylesSidebarPane.createPropertyFilterElement(WebInspector.UIString("Find in Styles"), this._onFilterChanged.bind(this));
          matchedStylesElement.appendChild(this._filterInput);
      },
  
      /**
       * @param {string} propertyName
       */
      tracePropertyName: function(propertyName)
      {
          this._requestShowCallback();
          this._filterInput.setFilterValue(WebInspector.CSSMetadata.canonicalPropertyName(propertyName));
      },
  
      /**
       * @param {?RegExp} regex
       */
      _onFilterChanged: function(regex)
      {
          this._filterRegex = regex;
          this._updateFilter();
      },
  
      /**
       * @return {?T}
       * @template T
       */
      _forcedPseudoClasses: function()
      {
          return this.node() ? (this.node().getUserProperty(WebInspector.CSSStyleModel.PseudoStatePropertyName) || undefined) : undefined;
      },
  
      _updateForcedPseudoStateInputs: function()
      {
          var node = this.node();
          if (!node)
              return;
  
          var hasPseudoType = !!node.pseudoType();
          this._elementStateButton.setEnabled(!hasPseudoType);
          this._elementStatePane.classList.toggle("expanded", !hasPseudoType && this._elementStateButton.toggled());
  
          var nodePseudoState = this._forcedPseudoClasses();
          if (!nodePseudoState)
              nodePseudoState = [];
  
          var inputs = this._elementStatePane.inputs;
          for (var i = 0; i < inputs.length; ++i)
              inputs[i].checked = nodePseudoState.indexOf(inputs[i].state) >= 0;
      },
  
      /**
       * @override
       * @param {?WebInspector.DOMNode} node
       */
      setNode: function(node)
      {
          // We should update SSP on main frame navigation only.
          var mainFrameNavigated = node && this.node() && node.ownerDocument !== this.node().ownerDocument;
          if (!mainFrameNavigated && node !== this.node()) {
              this.element.classList.toggle("no-affect", this._isEditingStyle);
              if (this._isEditingStyle) {
                  this._pendingNode = node;
                  return;
              }
          }
  
          this._stylesPopoverHelper.hide();
          if (node && node.nodeType() === Node.TEXT_NODE && node.parentNode)
              node = node.parentNode;
  
          if (node && node.nodeType() !== Node.ELEMENT_NODE)
              node = null;
  
          this._updateTarget(node ? node.target() : null);
  
          this._resetCache();
          this._computedStylePane.setNode(node);
          this._animationsControlPane.setNode(node);
          WebInspector.ElementsSidebarPane.prototype.setNode.call(this, node);
      },
  
      /**
       * @param {?WebInspector.Target} target
       */
      _updateTarget: function(target)
      {
          if (this._target === target)
              return;
          if (this._target) {
              this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetAdded, this._styleSheetOrMediaQueryResultChanged, this);
              this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetRemoved, this._styleSheetOrMediaQueryResultChanged, this);
              this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetChanged, this._styleSheetOrMediaQueryResultChanged, this);
              this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.MediaQueryResultChanged, this._styleSheetOrMediaQueryResultChanged, this);
              this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.PseudoStateForced, this._styleSheetOrMediaQueryResultChanged, this);
              this._domModel.removeEventListener(WebInspector.DOMModel.Events.AttrModified, this._attributeChanged, this);
              this._domModel.removeEventListener(WebInspector.DOMModel.Events.AttrRemoved, this._attributeChanged, this);
              this._target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.FrameResized, this._frameResized, this);
          }
          this._target = target;
          if (target) {
              this._domModel = WebInspector.DOMModel.fromTarget(target);
              this._cssModel = WebInspector.CSSStyleModel.fromTarget(target);
              this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetAdded, this._styleSheetOrMediaQueryResultChanged, this);
              this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetRemoved, this._styleSheetOrMediaQueryResultChanged, this);
              this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetChanged, this._styleSheetOrMediaQueryResultChanged, this);
              this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.MediaQueryResultChanged, this._styleSheetOrMediaQueryResultChanged, this);
              this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.PseudoStateForced, this._styleSheetOrMediaQueryResultChanged, this);
              this._domModel.addEventListener(WebInspector.DOMModel.Events.AttrModified, this._attributeChanged, this);
              this._domModel.addEventListener(WebInspector.DOMModel.Events.AttrRemoved, this._attributeChanged, this);
              this._target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.FrameResized, this._frameResized, this);
          }
      },
  
      /**
       * @param {!WebInspector.StylePropertiesSection=} editedSection
       */
      _refreshUpdate: function(editedSection)
      {
          var node = this.node();
          if (!node)
              return;
  
          for (var block of this._sectionBlocks) {
              for (var section of block.sections) {
                  if (section.isBlank)
                      continue;
                  section.update(section === editedSection);
              }
          }
  
          this._computedStylePane.update();
          if (this._filterRegex)
              this._updateFilter();
          this._nodeStylesUpdatedForTest(node, false);
      },
  
      /**
       * @override
       * @param {!WebInspector.Throttler.FinishCallback} finishedCallback
       */
      doUpdate: function(finishedCallback)
      {
          this._updateForcedPseudoStateInputs();
          this._discardElementUnderMouse();
  
          this._fetchMatchedCascade()
              .then(this._innerRebuildUpdate.bind(this))
              .then(finishedCallback)
              .catch(/** @type {function()} */(finishedCallback));
      },
  
      _resetCache: function()
      {
          delete this._matchedCascadePromise;
          this._resetComputedCache();
      },
  
      _resetComputedCache: function()
      {
          delete this._computedStylePromise;
      },
  
      /**
       * @return {!Promise.<?{matched: !WebInspector.SectionCascade, pseudo: !Map.<number, !WebInspector.SectionCascade>}>}
       */
      _fetchMatchedCascade: function()
      {
          var node = this.node();
          if (!node)
              return Promise.resolve(/** @type {?{matched: !WebInspector.SectionCascade, pseudo: !Map.<number, !WebInspector.SectionCascade>}} */(null));
          if (!this._matchedCascadePromise)
              this._matchedCascadePromise = new Promise(this._getMatchedStylesForNode.bind(this, node)).then(buildMatchedCascades.bind(this, node));
          return this._matchedCascadePromise;
  
          /**
           * @param {!WebInspector.DOMNode} node
           * @param {!WebInspector.StylesSidebarPane.MatchedRulesPayload} payload
           * @return {?{matched: !WebInspector.SectionCascade, pseudo: !Map.<number, !WebInspector.SectionCascade>}}
           * @this {WebInspector.StylesSidebarPane}
           */
          function buildMatchedCascades(node, payload)
          {
              if (node !== this.node() || !payload.fulfilled())
                  return null;
  
              return {
                  matched: this._buildMatchedRulesSectionCascade(node, payload),
                  pseudo: this._buildPseudoCascades(node, payload)
              };
          }
      },
  
      /**
       * @return {!Promise.<?WebInspector.CSSStyleDeclaration>}
       */
      _fetchComputedStyle: function()
      {
          var node = this.node();
          if (!node)
              return Promise.resolve(/** @type {?WebInspector.CSSStyleDeclaration} */(null));
  
          var cssModel = this._cssModel;
          if (!this._computedStylePromise)
              this._computedStylePromise = new Promise(getComputedStyle.bind(null, node)).then(verifyOutdated.bind(this, node));
  
          return this._computedStylePromise;
  
          /**
           * @param {!WebInspector.DOMNode} node
           * @param {function(?WebInspector.CSSStyleDeclaration)} resolve
           */
          function getComputedStyle(node, resolve)
          {
              cssModel.getComputedStyleAsync(node.id, resolve);
          }
  
          /**
           * @param {!WebInspector.DOMNode} node
           * @param {?WebInspector.CSSStyleDeclaration} style
           * @return {?WebInspector.CSSStyleDeclaration}
           * @this {WebInspector.StylesSidebarPane}
           */
          function verifyOutdated(node, style)
          {
              return node !== this.node() ? null : style;
          }
      },
  
      /**
       * @param {!WebInspector.DOMNode} node
       * @param {function(!WebInspector.StylesSidebarPane.MatchedRulesPayload)} callback
       */
      _getMatchedStylesForNode: function(node, callback)
      {
          var target = node.target();
          this._cssModel.getInlineStylesAsync(node.id, inlineCallback);
          this._cssModel.getMatchedStylesAsync(node.id, false, false, matchedCallback);
  
          var payload = new WebInspector.StylesSidebarPane.MatchedRulesPayload();
  
          /**
           * @param {?WebInspector.CSSStyleDeclaration} inlineStyle
           * @param {?WebInspector.CSSStyleDeclaration} attributesStyle
           */
          function inlineCallback(inlineStyle, attributesStyle)
          {
              payload.inlineStyle = /** @type {?WebInspector.CSSStyleDeclaration} */(inlineStyle);
              payload.attributesStyle = /** @type {?WebInspector.CSSStyleDeclaration} */(attributesStyle);
          }
  
          /**
           * @param {?*} matchedResult
           */
          function matchedCallback(matchedResult)
          {
              if (matchedResult) {
                  payload.matchedCSSRules = /** @type {?Array.<!WebInspector.CSSRule>} */(matchedResult.matchedCSSRules);
                  payload.pseudoElements = /** @type {?Array.<{pseudoId: number, rules: !Array.<!WebInspector.CSSRule>}>} */(matchedResult.pseudoElements);
                  payload.inherited = /** @type {?Array.<{matchedCSSRules: !Array.<!WebInspector.CSSRule>}>} */(matchedResult.inherited);
              }
              callback(payload);
          }
      },
  
      /**
       * @param {boolean} editing
       */
      setEditingStyle: function(editing)
      {
          if (this._isEditingStyle === editing)
              return;
          this._isEditingStyle = editing;
          if (!editing && this._pendingNode) {
              this.setNode(this._pendingNode);
              delete this._pendingNode;
          }
      },
  
      _styleSheetOrMediaQueryResultChanged: function()
      {
          if (this._userOperation || this._isEditingStyle) {
              this._resetComputedCache();
              return;
          }
  
          this._resetCache();
          this.update();
      },
  
      _frameResized: function()
      {
          /**
           * @this {WebInspector.StylesSidebarPane}
           */
          function refreshContents()
          {
              this._styleSheetOrMediaQueryResultChanged();
              delete this._activeTimer;
          }
  
          if (this._activeTimer)
              clearTimeout(this._activeTimer);
  
          this._activeTimer = setTimeout(refreshContents.bind(this), 100);
      },
  
      /**
       * @param {!WebInspector.Event} event
       */
      _attributeChanged: function(event)
      {
          // Any attribute removal or modification can affect the styles of "related" nodes.
          // Do not touch the styles if they are being edited.
          if (this._isEditingStyle || this._userOperation) {
              this._resetComputedCache();
              return;
          }
  
          if (!this._canAffectCurrentStyles(event.data.node))
              return;
  
          this._resetCache();
          this.update();
      },
  
      /**
       * @param {?WebInspector.DOMNode} node
       */
      _canAffectCurrentStyles: function(node)
      {
          var currentNode = this.node();
          return currentNode && (currentNode === node || node.parentNode === currentNode.parentNode || node.isAncestor(currentNode));
      },
  
      /**
       * @param {?{matched: !WebInspector.SectionCascade, pseudo: !Map.<number, !WebInspector.SectionCascade>}} cascades
       */
      _innerRebuildUpdate: function(cascades)
      {
          this._linkifier.reset();
          this._sectionsContainer.removeChildren();
          this._sectionBlocks = [];
  
          var node = this.node();
          if (!cascades || !node)
              return;
  
          this._sectionBlocks = this._rebuildSectionsForMatchedStyleRules(cascades.matched);
          var pseudoIds = cascades.pseudo.keysArray().sort();
          for (var pseudoId of pseudoIds) {
              var block = WebInspector.SectionBlock.createPseudoIdBlock(pseudoId);
              var cascade = cascades.pseudo.get(pseudoId);
              for (var sectionModel of cascade.sectionModels()) {
                  var section = new WebInspector.StylePropertiesSection(this, sectionModel);
                  block.sections.push(section);
              }
              this._sectionBlocks.push(block);
          }
  
          if (!!node.pseudoType())
              this._appendTopPadding();
  
          for (var block of this._sectionBlocks) {
              var titleElement = block.titleElement();
              if (titleElement)
                  this._sectionsContainer.appendChild(titleElement);
              for (var section of block.sections)
                  this._sectionsContainer.appendChild(section.element);
          }
  
          if (this._filterRegex)
              this._updateFilter();
  
          this._nodeStylesUpdatedForTest(node, true);
          this._computedStylePane.update();
      },
  
      /**
       * @param {!WebInspector.DOMNode} node
       * @param {!WebInspector.StylesSidebarPane.MatchedRulesPayload} styles
       * @return {!Map<number, !WebInspector.SectionCascade>}
       */
      _buildPseudoCascades: function(node, styles)
      {
          var pseudoCascades = new Map();
          for (var i = 0; i < styles.pseudoElements.length; ++i) {
              var pseudoElementCSSRules = styles.pseudoElements[i];
              var pseudoId = pseudoElementCSSRules.pseudoId;
  
              // Add rules in reverse order to match the cascade order.
              var pseudoElementCascade = new WebInspector.SectionCascade();
              for (var j = pseudoElementCSSRules.rules.length - 1; j >= 0; --j) {
                  var rule = pseudoElementCSSRules.rules[j];
                  pseudoElementCascade.appendModelFromRule(rule);
              }
              pseudoCascades.set(pseudoId, pseudoElementCascade);
          }
          return pseudoCascades;
      },
  
      /**
       * @param {!WebInspector.DOMNode} node
       * @param {boolean} rebuild
       */
      _nodeStylesUpdatedForTest: function(node, rebuild)
      {
          // For sniffing in tests.
      },
  
      /**
       * @param {!WebInspector.DOMNode} node
       * @param {!WebInspector.StylesSidebarPane.MatchedRulesPayload} styles
       * @return {!WebInspector.SectionCascade}
       */
      _buildMatchedRulesSectionCascade: function(node, styles)
      {
          var cascade = new WebInspector.SectionCascade();
  
          function addAttributesStyle()
          {
              if (!styles.attributesStyle)
                  return;
              var selectorText = node.nodeNameInCorrectCase() + "[" + WebInspector.UIString("Attributes Style") + "]";
              cascade.appendModelFromStyle(styles.attributesStyle, selectorText);
          }
  
          // Inline style has the greatest specificity.
          if (styles.inlineStyle && node.nodeType() === Node.ELEMENT_NODE) {
              var model = cascade.appendModelFromStyle(styles.inlineStyle, "element.style");
              model.setIsAttribute(true);
          }
  
          // Add rules in reverse order to match the cascade order.
          var addedAttributesStyle;
          for (var i = styles.matchedCSSRules.length - 1; i >= 0; --i) {
              var rule = styles.matchedCSSRules[i];
              if ((rule.isInjected || rule.isUserAgent) && !addedAttributesStyle) {
                  // Show element's Style Attributes after all author rules.
                  addedAttributesStyle = true;
                  addAttributesStyle();
              }
              cascade.appendModelFromRule(rule);
          }
  
          if (!addedAttributesStyle)
              addAttributesStyle();
  
          // Walk the node structure and identify styles with inherited properties.
          var parentNode = node.parentNode;
  
          for (var parentOrdinal = 0; parentOrdinal < styles.inherited.length; ++parentOrdinal) {
              var parentStyles = styles.inherited[parentOrdinal];
              if (parentStyles.inlineStyle) {
                  if (this._containsInherited(parentStyles.inlineStyle)) {
                      var model = cascade.appendModelFromStyle(parentStyles.inlineStyle, WebInspector.UIString("Style Attribute"), parentNode);
                      model.setIsAttribute(true);
                  }
              }
  
              for (var i = parentStyles.matchedCSSRules.length - 1; i >= 0; --i) {
                  var rulePayload = parentStyles.matchedCSSRules[i];
                  if (!this._containsInherited(rulePayload.style))
                      continue;
                  cascade.appendModelFromRule(rulePayload, parentNode);
              }
              parentNode = parentNode.parentNode;
          }
          return cascade;
      },
  
      _appendTopPadding: function()
      {
          var separatorElement = createElement("div");
          separatorElement.className = "styles-sidebar-placeholder";
          this._sectionsContainer.appendChild(separatorElement);
      },
  
      /**
       * @param {!WebInspector.SectionCascade} matchedCascade
       * @return {!Array.<!WebInspector.SectionBlock>}
       */
      _rebuildSectionsForMatchedStyleRules: function(matchedCascade)
      {
          var blocks = [new WebInspector.SectionBlock(null)];
          var lastParentNode = null;
          for (var sectionModel of matchedCascade.sectionModels()) {
              var parentNode = sectionModel.parentNode();
              if (parentNode && parentNode !== lastParentNode) {
                  lastParentNode = parentNode;
                  var block = WebInspector.SectionBlock.createInheritedNodeBlock(lastParentNode);
                  blocks.push(block);
              }
  
              var section = new WebInspector.StylePropertiesSection(this, sectionModel);
              blocks.peekLast().sections.push(section);
          }
          return blocks;
      },
  
      /**
       * @param {!WebInspector.CSSStyleDeclaration} style
       * @return {boolean}
       */
      _containsInherited: function(style)
      {
          var properties = style.allProperties;
          for (var i = 0; i < properties.length; ++i) {
              var property = properties[i];
              // Does this style contain non-overridden inherited property?
              if (property.isLive && WebInspector.CSSMetadata.isPropertyInherited(property.name))
                  return true;
          }
          return false;
      },
  
      /**
       * @param {!WebInspector.Event} event
       */
      _colorFormatSettingChanged: function(event)
      {
          for (var block of this._sectionBlocks) {
              for (var section of block.sections)
                  section.update(true);
          }
      },
  
      _createNewRuleInViaInspectorStyleSheet: function()
      {
          var cssModel = this._cssModel;
          this._userOperation = true;
          cssModel.requestViaInspectorStylesheet(this.node(), onViaInspectorStyleSheet.bind(this));
  
          /**
           * @param {?WebInspector.CSSStyleSheetHeader} styleSheetHeader
           * @this {WebInspector.StylesSidebarPane}
           */
          function onViaInspectorStyleSheet(styleSheetHeader)
          {
              delete this._userOperation;
              this._createNewRuleInStyleSheet(styleSheetHeader);
          }
      },
  
      /**
       * @param {?WebInspector.CSSStyleSheetHeader} styleSheetHeader
       */
      _createNewRuleInStyleSheet: function(styleSheetHeader)
      {
          if (!styleSheetHeader)
              return;
          styleSheetHeader.requestContent(onStyleSheetContent.bind(this, styleSheetHeader.id));
  
          /**
           * @param {string} styleSheetId
           * @param {string} text
           * @this {WebInspector.StylesSidebarPane}
           */
          function onStyleSheetContent(styleSheetId, text)
          {
              var lines = text.split("\n");
              var range = WebInspector.TextRange.createFromLocation(lines.length - 1, lines[lines.length - 1].length);
              this._addBlankSection(this._sectionBlocks[0].sections[0], styleSheetId, range);
          }
      },
  
      /**
       * @param {!WebInspector.StylePropertiesSection} insertAfterSection
       * @param {string} styleSheetId
       * @param {!WebInspector.TextRange} ruleLocation
       */
      _addBlankSection: function(insertAfterSection, styleSheetId, ruleLocation)
      {
          this.expand();
          var node = this.node();
          var blankSection = new WebInspector.BlankStylePropertiesSection(this, node ? WebInspector.DOMPresentationUtils.simpleSelector(node) : "", styleSheetId, ruleLocation, insertAfterSection.styleRule);
  
          this._sectionsContainer.insertBefore(blankSection.element, insertAfterSection.element.nextSibling);
  
          for (var block of this._sectionBlocks) {
              var index = block.sections.indexOf(insertAfterSection);
              if (index === -1)
                  continue;
              block.sections.splice(index + 1, 0, blankSection);
              blankSection.startEditingSelector();
          }
      },
  
      /**
       * @param {!WebInspector.StylePropertiesSection} section
       */
      removeSection: function(section)
      {
          for (var block of this._sectionBlocks) {
              var index = block.sections.indexOf(section);
              if (index === -1)
                  continue;
              block.sections.splice(index, 1);
              section.element.remove();
          }
      },
  
      _toggleElementStatePane: function()
      {
          var buttonToggled = !this._elementStateButton.toggled();
          if (buttonToggled)
              this.expand();
          this._elementStateButton.setToggled(buttonToggled);
          this._elementStatePane.classList.toggle("expanded", buttonToggled);
          this._animationsControlButton.setToggled(false);
          this._animationsControlPane.element.classList.remove("expanded");
      },
  
      _createElementStatePane: function()
      {
          this._elementStatePane = createElement("div");
          this._elementStatePane.className = "styles-element-state-pane source-code";
          var table = createElement("table");
  
          var inputs = [];
          this._elementStatePane.inputs = inputs;
  
          /**
           * @param {!Event} event
           * @this {WebInspector.StylesSidebarPane}
           */
          function clickListener(event)
          {
              var node = this.node();
              if (!node)
                  return;
              WebInspector.CSSStyleModel.fromNode(node).forcePseudoState(node, event.target.state, event.target.checked);
          }
  
          /**
           * @param {string} state
           * @return {!Element}
           * @this {WebInspector.StylesSidebarPane}
           */
          function createCheckbox(state)
          {
              var td = createElement("td");
              var label = createCheckboxLabel(":" + state);
              var input = label.checkboxElement;
              input.state = state;
              input.addEventListener("click", clickListener.bind(this), false);
              inputs.push(input);
              td.appendChild(label);
              return td;
          }
  
          var tr = table.createChild("tr");
          tr.appendChild(createCheckbox.call(this, "active"));
          tr.appendChild(createCheckbox.call(this, "hover"));
  
          tr = table.createChild("tr");
          tr.appendChild(createCheckbox.call(this, "focus"));
          tr.appendChild(createCheckbox.call(this, "visited"));
  
          this._elementStatePane.appendChild(table);
      },
  
      _toggleAnimationsControlPane: function()
      {
          var buttonToggled = !this._animationsControlButton.toggled();
          if (buttonToggled)
              this.expand();
          this._animationsControlButton.setToggled(buttonToggled);
          this._animationsControlPane.element.classList.toggle("expanded", buttonToggled);
          this._elementStateButton.setToggled(false);
          this._elementStatePane.classList.remove("expanded");
      },
  
      /**
       * @return {?RegExp}
       */
      filterRegex: function()
      {
          return this._filterRegex;
      },
  
      _updateFilter: function()
      {
          for (var block of this._sectionBlocks)
              block.updateFilter();
      },
  
      /**
       * @override
       */
      wasShown: function()
      {
          WebInspector.ElementsSidebarPane.prototype.wasShown.call(this);
          this.element.ownerDocument.body.addEventListener("keydown", this._keyDownBound, false);
          this.element.ownerDocument.body.addEventListener("keyup", this._keyUpBound, false);
      },
  
      /**
       * @override
       */
      willHide: function()
      {
          this.element.ownerDocument.body.removeEventListener("keydown", this._keyDownBound, false);
          this.element.ownerDocument.body.removeEventListener("keyup", this._keyUpBound, false);
          this._stylesPopoverHelper.hide();
          this._discardElementUnderMouse();
          WebInspector.ElementsSidebarPane.prototype.willHide.call(this);
      },
  
      _discardElementUnderMouse: function()
      {
          if (this._elementUnderMouse)
              this._elementUnderMouse.classList.remove("styles-panel-hovered");
          delete this._elementUnderMouse;
      },
  
      /**
       * @param {!Event} event
       */
      _mouseMovedOverElement: function(event)
      {
          if (this._elementUnderMouse && event.target !== this._elementUnderMouse)
              this._discardElementUnderMouse();
          this._elementUnderMouse = event.target;
          if (WebInspector.KeyboardShortcut.eventHasCtrlOrMeta(/** @type {!MouseEvent} */(event)))
              this._elementUnderMouse.classList.add("styles-panel-hovered");
      },
  
      /**
       * @param {!Event} event
       */
      _keyDown: function(event)
      {
          if ((!WebInspector.isMac() && event.keyCode === WebInspector.KeyboardShortcut.Keys.Ctrl.code) ||
              (WebInspector.isMac() && event.keyCode === WebInspector.KeyboardShortcut.Keys.Meta.code)) {
              if (this._elementUnderMouse)
                  this._elementUnderMouse.classList.add("styles-panel-hovered");
          }
      },
  
      /**
       * @param {!Event} event
       */
      _keyUp: function(event)
      {
          if ((!WebInspector.isMac() && event.keyCode === WebInspector.KeyboardShortcut.Keys.Ctrl.code) ||
              (WebInspector.isMac() && event.keyCode === WebInspector.KeyboardShortcut.Keys.Meta.code)) {
              this._discardElementUnderMouse();
          }
      },
  
      __proto__: WebInspector.ElementsSidebarPane.prototype
  }
  
  /**
   * @param {string} placeholder
   * @return {!Element}
   * @param {function(?RegExp)} filterCallback
   */
  WebInspector.StylesSidebarPane.createPropertyFilterElement = function(placeholder, filterCallback)
  {
      var input = createElement("input");
      input.type = "search";
      input.placeholder = placeholder;
  
      function searchHandler()
      {
          var regex = input.value ? new RegExp(input.value.escapeForRegExp(), "i") : null;
          filterCallback(regex);
          input.parentNode.classList.toggle("styles-filter-engaged", !!input.value);
      }
      input.addEventListener("input", searchHandler, false);
  
      /**
       * @param {!Event} event
       */
      function keydownHandler(event)
      {
          var Esc = "U+001B";
          if (event.keyIdentifier !== Esc || !input.value)
              return;
          event.consume(true);
          input.value = "";
          searchHandler();
      }
      input.addEventListener("keydown", keydownHandler, false);
  
      input.setFilterValue = setFilterValue;
  
      /**
       * @param {string} value
       */
      function setFilterValue(value)
      {
          input.value = value;
          input.focus();
          searchHandler();
      }
  
      return input;
  }
  
  /**
   * @constructor
   * @param {?Element} titleElement
   */
  WebInspector.SectionBlock = function(titleElement)
  {
      this._titleElement = titleElement;
      this.sections = [];
  }
  
  /**
   * @param {number} pseudoId
   * @return {!WebInspector.SectionBlock}
   */
  WebInspector.SectionBlock.createPseudoIdBlock = function(pseudoId)
  {
      var separatorElement = createElement("div");
      separatorElement.className = "sidebar-separator";
      var pseudoName = WebInspector.StylesSidebarPane.PseudoIdNames[pseudoId];
      if (pseudoName)
          separatorElement.textContent = WebInspector.UIString("Pseudo ::%s element", pseudoName);
      else
          separatorElement.textContent = WebInspector.UIString("Pseudo element");
      return new WebInspector.SectionBlock(separatorElement);
  }
  
  /**
   * @param {!WebInspector.DOMNode} node
   * @return {!WebInspector.SectionBlock}
   */
  WebInspector.SectionBlock.createInheritedNodeBlock = function(node)
  {
      var separatorElement = createElement("div");
      separatorElement.className = "sidebar-separator";
      var link = WebInspector.DOMPresentationUtils.linkifyNodeReference(node);
      separatorElement.createTextChild(WebInspector.UIString("Inherited from") + " ");
      separatorElement.appendChild(link);
      return new WebInspector.SectionBlock(separatorElement);
  }
  
  WebInspector.SectionBlock.prototype = {
      updateFilter: function()
      {
          var hasAnyVisibleSection = false;
          for (var section of this.sections)
              hasAnyVisibleSection |= section._updateFilter();
          if (this._titleElement)
              this._titleElement.classList.toggle("hidden", !hasAnyVisibleSection);
      },
  
      /**
       * @return {?Element}
       */
      titleElement: function()
      {
          return this._titleElement;
      }
  }
  
  /**
   * @constructor
   * @param {!WebInspector.StylesSidebarPane} parentPane
   * @param {!WebInspector.StylesSectionModel} styleRule
   */
  WebInspector.StylePropertiesSection = function(parentPane, styleRule)
  {
      this._parentPane = parentPane;
      this.styleRule = styleRule;
      this.editable = styleRule.editable();
  
      var rule = styleRule.rule();
      this.element = createElementWithClass("div", "styles-section matched-styles monospace");
      this.element._section = this;
  
      this.titleElement = this.element.createChild("div", "styles-section-title " + (rule ? "styles-selector" : ""));
  
      this.propertiesTreeOutline = new TreeOutline();
      this.propertiesTreeOutline.element.classList.add("style-properties", "monospace");
      this.propertiesTreeOutline.section = this;
      this.element.appendChild(this.propertiesTreeOutline.element);
  
      var selectorContainer = createElement("div");
      this._selectorElement = createElementWithClass("span", "selector");
      this._selectorElement.textContent = styleRule.selectorText();
      selectorContainer.appendChild(this._selectorElement);
  
      var openBrace = createElement("span");
      openBrace.textContent = " {";
      selectorContainer.appendChild(openBrace);
      selectorContainer.addEventListener("mousedown", this._handleEmptySpaceMouseDown.bind(this), false);
      selectorContainer.addEventListener("click", this._handleSelectorContainerClick.bind(this), false);
  
      var closeBrace = createElement("div");
      closeBrace.textContent = "}";
      this.element.appendChild(closeBrace);
  
      if (this.editable && rule) {
          var newRuleButton = closeBrace.createChild("div", "sidebar-pane-button-new-rule");
          newRuleButton.title = WebInspector.UIString("Insert Style Rule");
          newRuleButton.addEventListener("click", this._onNewRuleClick.bind(this), false);
      }
  
      this._selectorElement.addEventListener("click", this._handleSelectorClick.bind(this), false);
      this.element.addEventListener("mousedown", this._handleEmptySpaceMouseDown.bind(this), false);
      this.element.addEventListener("click", this._handleEmptySpaceClick.bind(this), false);
  
      if (rule) {
          // Prevent editing the user agent and user rules.
          if (rule.isUserAgent || rule.isInjected) {
              this.editable = false;
          } else {
              // Check this is a real CSSRule, not a bogus object coming from WebInspector.BlankStylePropertiesSection.
              if (rule.styleSheetId)
                  this.navigable = !!rule.resourceURL();
          }
      }
  
      this._selectorRefElement = createElementWithClass("div", "styles-section-subtitle");
      this._mediaListElement = this.titleElement.createChild("div", "media-list media-matches");
      this._updateMediaList();
      this._updateRuleOrigin();
      selectorContainer.insertBefore(this._selectorRefElement, selectorContainer.firstChild);
      this.titleElement.appendChild(selectorContainer);
      this._selectorContainer = selectorContainer;
  
      if (this.navigable)
          this.element.classList.add("navigable");
  
      if (!this.editable)
          this.element.classList.add("read-only");
  
      this._markSelectorMatches();
      this.onpopulate();
  }
  
  WebInspector.StylePropertiesSection.prototype = {
      /**
       * @return {?WebInspector.StylePropertiesSection}
       */
      firstSibling: function()
      {
          var parent = this.element.parentElement;
          if (!parent)
              return null;
  
          var childElement = parent.firstChild;
          while (childElement) {
              if (childElement._section)
                  return childElement._section;
              childElement = childElement.nextSibling;
          }
  
          return null;
      },
  
      /**
       * @return {?WebInspector.StylePropertiesSection}
       */
      lastSibling: function()
      {
          var parent = this.element.parentElement;
          if (!parent)
              return null;
  
          var childElement = parent.lastChild;
          while (childElement) {
              if (childElement._section)
                  return childElement._section;
              childElement = childElement.previousSibling;
          }
  
          return null;
      },
  
      /**
       * @return {?WebInspector.StylePropertiesSection}
       */
      nextSibling: function()
      {
          var curElement = this.element;
          do {
              curElement = curElement.nextSibling;
          } while (curElement && !curElement._section);
  
          return curElement ? curElement._section : null;
      },
  
      /**
       * @return {?WebInspector.StylePropertiesSection}
       */
      previousSibling: function()
      {
          var curElement = this.element;
          do {
              curElement = curElement.previousSibling;
          } while (curElement && !curElement._section);
  
          return curElement ? curElement._section : null;
      },
  
      /**
       * @return {boolean}
       */
      inherited: function()
      {
          return this.styleRule.inherited();
      },
  
      /**
       * @return {?WebInspector.CSSRule}
       */
      rule: function()
      {
          return this.styleRule.rule();
      },
  
      /**
       * @param {?Event} event
       */
      _onNewRuleClick: function(event)
      {
          event.consume();
          var rule = this.rule();
          var range = WebInspector.TextRange.createFromLocation(rule.style.range.endLine, rule.style.range.endColumn + 1);
          this._parentPane._addBlankSection(this, /** @type {string} */(rule.styleSheetId), range);
      },
  
      /**
       * @param {!WebInspector.CSSRule} editedRule
       * @param {!WebInspector.TextRange} oldRange
       * @param {!WebInspector.TextRange} newRange
       */
      _styleSheetRuleEdited: function(editedRule, oldRange, newRange)
      {
          var rule = this.rule();
          if (!rule || !rule.styleSheetId)
              return;
          if (rule !== editedRule)
              rule.sourceStyleSheetEdited(/** @type {string} */(editedRule.styleSheetId), oldRange, newRange);
          this._updateMediaList();
          this._updateRuleOrigin();
      },
  
      /**
       * @param {!WebInspector.CSSMedia} oldMedia
       * @param {!WebInspector.CSSMedia} newMedia
       */
      _styleSheetMediaEdited: function(oldMedia, newMedia)
      {
          var rule = this.rule();
          if (!rule || !rule.styleSheetId)
              return;
          rule.mediaEdited(oldMedia, newMedia);
          this._updateMediaList();
      },
  
      /**
       * @param {?Array.<!WebInspector.CSSMedia>} mediaRules
       */
      _createMediaList: function(mediaRules)
      {
          if (!mediaRules)
              return;
          for (var i = mediaRules.length - 1; i >= 0; --i) {
              var media = mediaRules[i];
              var mediaDataElement = this._mediaListElement.createChild("div", "media");
              if (media.sourceURL) {
                  var refElement = mediaDataElement.createChild("div", "subtitle");
                  var anchor = this._parentPane._linkifier.linkifyMedia(media);
                  refElement.appendChild(anchor);
              }
  
              var mediaContainerElement = mediaDataElement.createChild("span");
              var mediaTextElement = mediaContainerElement.createChild("span", "media-text");
              mediaTextElement.title = media.text;
              switch (media.source) {
              case WebInspector.CSSMedia.Source.LINKED_SHEET:
              case WebInspector.CSSMedia.Source.INLINE_SHEET:
                  mediaTextElement.textContent = "media=\"" + media.text + "\"";
                  break;
              case WebInspector.CSSMedia.Source.MEDIA_RULE:
                  var decoration = mediaContainerElement.createChild("span");
                  mediaContainerElement.insertBefore(decoration, mediaTextElement);
                  decoration.textContent = "@media ";
                  decoration.title = media.text;
                  mediaTextElement.textContent = media.text;
                  if (media.parentStyleSheetId) {
                      mediaDataElement.classList.add("editable-media");
                      mediaTextElement.addEventListener("click", this._handleMediaRuleClick.bind(this, media, mediaTextElement), false);
                  }
                  break;
              case WebInspector.CSSMedia.Source.IMPORT_RULE:
                  mediaTextElement.textContent = "@import " + media.text;
                  break;
              }
          }
      },
  
      _updateMediaList: function()
      {
          this._mediaListElement.removeChildren();
          this._createMediaList(this.styleRule.media());
      },
  
      /**
       * @param {string} propertyName
       * @return {boolean}
       */
      isPropertyInherited: function(propertyName)
      {
          if (this.inherited()) {
              // While rendering inherited stylesheet, reverse meaning of this property.
              // Render truly inherited properties with black, i.e. return them as non-inherited.
              return !WebInspector.CSSMetadata.isPropertyInherited(propertyName);
          }
          return false;
      },
  
      /**
       * @return {?WebInspector.StylePropertiesSection}
       */
      nextEditableSibling: function()
      {
          var curSection = this;
          do {
              curSection = curSection.nextSibling();
          } while (curSection && !curSection.editable);
  
          if (!curSection) {
              curSection = this.firstSibling();
              while (curSection && !curSection.editable)
                  curSection = curSection.nextSibling();
          }
  
          return (curSection && curSection.editable) ? curSection : null;
      },
  
      /**
       * @return {?WebInspector.StylePropertiesSection}
       */
      previousEditableSibling: function()
      {
          var curSection = this;
          do {
              curSection = curSection.previousSibling();
          } while (curSection && !curSection.editable);
  
          if (!curSection) {
              curSection = this.lastSibling();
              while (curSection && !curSection.editable)
                  curSection = curSection.previousSibling();
          }
  
          return (curSection && curSection.editable) ? curSection : null;
      },
  
      /**
       * @param {boolean} full
       */
      update: function(full)
      {
          if (this.styleRule.selectorText())
              this._selectorElement.textContent = this.styleRule.selectorText();
          this._markSelectorMatches();
          if (full) {
              this.propertiesTreeOutline.removeChildren();
              this.onpopulate();
          } else {
              var child = this.propertiesTreeOutline.firstChild();
              while (child) {
                  child.overloaded = this.styleRule.isPropertyOverloaded(child.name, child.isShorthand);
                  child = child.traverseNextTreeElement(false, null, true);
              }
          }
          this.afterUpdate();
      },
  
      afterUpdate: function()
      {
          if (this._afterUpdate) {
              this._afterUpdate(this);
              delete this._afterUpdate;
              this._afterUpdateFinishedForTest();
          }
      },
  
      _afterUpdateFinishedForTest: function()
      {
      },
  
      onpopulate: function()
      {
          var style = this.styleRule.style();
          var allProperties = style.allProperties;
  
          var styleHasEditableSource = this.editable && !!style.range;
          if (styleHasEditableSource) {
              for (var i = 0; i < allProperties.length; ++i) {
                  var property = allProperties[i];
                  if (property.styleBased)
                      continue;
  
                  var isShorthand = !!WebInspector.CSSMetadata.cssPropertiesMetainfo.longhands(property.name);
                  var inherited = this.isPropertyInherited(property.name);
                  var overloaded = property.inactive || this.styleRule.isPropertyOverloaded(property.name);
                  var item = new WebInspector.StylePropertyTreeElement(this._parentPane, this.styleRule, property, isShorthand, inherited, overloaded);
                  this.propertiesTreeOutline.appendChild(item);
              }
              return;
          }
  
          var generatedShorthands = {};
          // For style-based properties, generate shorthands with values when possible.
          for (var i = 0; i < allProperties.length; ++i) {
              var property = allProperties[i];
              var isShorthand = !!WebInspector.CSSMetadata.cssPropertiesMetainfo.longhands(property.name);
  
              // For style-based properties, try generating shorthands.
              var shorthands = isShorthand ? null : WebInspector.CSSMetadata.cssPropertiesMetainfo.shorthands(property.name);
              var shorthandPropertyAvailable = false;
              for (var j = 0; shorthands && !shorthandPropertyAvailable && j < shorthands.length; ++j) {
                  var shorthand = shorthands[j];
                  if (shorthand in generatedShorthands) {
                      shorthandPropertyAvailable = true;
                      continue;  // There already is a shorthand this longhands falls under.
                  }
                  if (style.getLiveProperty(shorthand)) {
                      shorthandPropertyAvailable = true;
                      continue;  // There is an explict shorthand property this longhands falls under.
                  }
                  if (!style.shorthandValue(shorthand)) {
                      shorthandPropertyAvailable = false;
                      continue;  // Never generate synthetic shorthands when no value is available.
                  }
  
                  // Generate synthetic shorthand we have a value for.
                  var shorthandProperty = new WebInspector.CSSProperty(style, style.allProperties.length, shorthand, style.shorthandValue(shorthand), false, false, true, true);
                  var overloaded = property.inactive || this.styleRule.isPropertyOverloaded(property.name, true);
                  var item = new WebInspector.StylePropertyTreeElement(this._parentPane, this.styleRule, shorthandProperty,  /* isShorthand */ true, /* inherited */ false, overloaded);
                  this.propertiesTreeOutline.appendChild(item);
                  generatedShorthands[shorthand] = shorthandProperty;
                  shorthandPropertyAvailable = true;
              }
              if (shorthandPropertyAvailable)
                  continue;  // Shorthand for the property found.
  
              var inherited = this.isPropertyInherited(property.name);
              var overloaded = property.inactive || this.styleRule.isPropertyOverloaded(property.name, isShorthand);
              var item = new WebInspector.StylePropertyTreeElement(this._parentPane, this.styleRule, property, isShorthand, inherited, overloaded);
              this.propertiesTreeOutline.appendChild(item);
          }
      },
  
      /**
       * @return {boolean}
       */
      _updateFilter: function()
      {
          var hasMatchingChild = false;
          for (var child of this.propertiesTreeOutline.rootElement().children())
              hasMatchingChild |= child._updateFilter();
  
          if (this.styleRule.isAttribute())
              return true;
  
          var regex = this._parentPane.filterRegex();
          var hideRule = !hasMatchingChild && regex && !regex.test(this.element.textContent);
          this.element.classList.toggle("hidden", hideRule);
          if (!hideRule && this.styleRule.rule())
              this._markSelectorHighlights();
          return !hideRule;
      },
  
      _markSelectorMatches: function()
      {
          var rule = this.styleRule.rule();
          if (!rule)
              return;
  
          this._mediaListElement.classList.toggle("media-matches", this.styleRule.mediaMatches());
  
          if (!this.styleRule.hasMatchingSelectors())
              return;
  
          var selectors = rule.selectors;
          var fragment = createDocumentFragment();
          var currentMatch = 0;
          var matchingSelectors = rule.matchingSelectors;
          for (var i = 0; i < selectors.length ; ++i) {
              if (i)
                  fragment.createTextChild(", ");
              var isSelectorMatching = matchingSelectors[currentMatch] === i;
              if (isSelectorMatching)
                  ++currentMatch;
              var matchingSelectorClass = isSelectorMatching ? " selector-matches" : "";
              var selectorElement = createElement("span");
              selectorElement.className = "simple-selector" + matchingSelectorClass;
              if (rule.styleSheetId)
                  selectorElement._selectorIndex = i;
              selectorElement.textContent = selectors[i].value;
  
              fragment.appendChild(selectorElement);
          }
  
          this._selectorElement.removeChildren();
          this._selectorElement.appendChild(fragment);
          this._markSelectorHighlights();
      },
  
      _markSelectorHighlights: function()
      {
          var selectors = this._selectorElement.getElementsByClassName("simple-selector");
          var regex = this._parentPane.filterRegex();
          for (var i = 0; i < selectors.length; ++i) {
              var selectorMatchesFilter = regex && regex.test(selectors[i].textContent);
              selectors[i].classList.toggle("filter-match", selectorMatchesFilter);
          }
      },
  
      /**
       * @return {boolean}
       */
      _checkWillCancelEditing: function()
      {
          var willCauseCancelEditing = this._willCauseCancelEditing;
          delete this._willCauseCancelEditing;
          return willCauseCancelEditing;
      },
  
      /**
       * @param {!Event} event
       */
      _handleSelectorContainerClick: function(event)
      {
          if (this._checkWillCancelEditing() || !this.editable)
              return;
          if (event.target === this._selectorContainer) {
              this.addNewBlankProperty(0).startEditing();
              event.consume(true);
          }
      },
  
      /**
       * @param {number=} index
       * @return {!WebInspector.StylePropertyTreeElement}
       */
      addNewBlankProperty: function(index)
      {
          var property = this.styleRule.style().newBlankProperty(index);
          var item = new WebInspector.StylePropertyTreeElement(this._parentPane, this.styleRule, property, false, false, false);
          index = property.index;
          this.propertiesTreeOutline.insertChild(item, index);
          item.listItemElement.textContent = "";
          item._newProperty = true;
          item.updateTitle();
          return item;
      },
  
      _handleEmptySpaceMouseDown: function()
      {
          this._willCauseCancelEditing = this._parentPane._isEditingStyle;
      },
  
      /**
       * @param {!Event} event
       */
      _handleEmptySpaceClick: function(event)
      {
          if (!this.editable)
              return;
  
          if (!event.target.isComponentSelectionCollapsed())
              return;
  
          if (this._checkWillCancelEditing())
              return;
  
          if (event.target.enclosingNodeOrSelfWithNodeName("a"))
              return;
  
          if (event.target.classList.contains("header") || this.element.classList.contains("read-only") || event.target.enclosingNodeOrSelfWithClass("media")) {
              event.consume();
              return;
          }
          this.addNewBlankProperty().startEditing();
          event.consume(true);
      },
  
      /**
       * @param {!WebInspector.CSSMedia} media
       * @param {!Element} element
       * @param {!Event} event
       */
      _handleMediaRuleClick: function(media, element, event)
      {
          if (WebInspector.isBeingEdited(element))
              return;
  
          var config = new WebInspector.InplaceEditor.Config(this._editingMediaCommitted.bind(this, media), this._editingMediaCancelled.bind(this, element), undefined, this._editingMediaBlurHandler.bind(this));
          WebInspector.InplaceEditor.startEditing(element, config);
  
          element.getComponentSelection().setBaseAndExtent(element, 0, element, 1);
          this._parentPane.setEditingStyle(true);
          var parentMediaElement = element.enclosingNodeOrSelfWithClass("media");
          parentMediaElement.classList.add("editing-media");
  
          event.consume(true);
      },
  
      /**
       * @param {!Element} element
       */
      _editingMediaFinished: function(element)
      {
          this._parentPane.setEditingStyle(false);
          var parentMediaElement = element.enclosingNodeOrSelfWithClass("media");
          parentMediaElement.classList.remove("editing-media");
      },
  
      /**
       * @param {!Element} element
       */
      _editingMediaCancelled: function(element)
      {
          this._editingMediaFinished(element);
          // Mark the selectors in group if necessary.
          // This is overridden by BlankStylePropertiesSection.
          this._markSelectorMatches();
          element.getComponentSelection().collapse(element, 0);
      },
  
      /**
       * @param {!Element} editor
       * @param {!Event} blurEvent
       * @return {boolean}
       */
      _editingMediaBlurHandler: function(editor, blurEvent)
      {
          return true;
      },
  
      /**
       * @param {!WebInspector.CSSMedia} media
       * @param {!Element} element
       * @param {string} newContent
       * @param {string} oldContent
       * @param {(!WebInspector.StylePropertyTreeElement.Context|undefined)} context
       * @param {string} moveDirection
       */
      _editingMediaCommitted: function(media, element, newContent, oldContent, context, moveDirection)
      {
          this._parentPane.setEditingStyle(false);
          this._editingMediaFinished(element);
  
          if (newContent)
              newContent = newContent.trim();
  
          /**
           * @param {!WebInspector.CSSMedia} newMedia
           * @this {WebInspector.StylePropertiesSection}
           */
          function successCallback(newMedia)
          {
              this._parentPane._styleSheetMediaEdited(media, newMedia);
              this._parentPane._refreshUpdate(this);
              finishOperation.call(this);
          }
  
          /**
           * @this {WebInspector.StylePropertiesSection}
           */
          function finishOperation()
          {
              delete this._parentPane._userOperation;
              this._editingMediaTextCommittedForTest();
          }
  
          // This gets deleted in finishOperation(), which is called both on success and failure.
          this._parentPane._userOperation = true;
          this._parentPane._cssModel.setMediaText(media, newContent, successCallback.bind(this), finishOperation.bind(this));
      },
  
      _editingMediaTextCommittedForTest: function() { },
  
      /**
       * @param {!Event} event
       */
      _handleSelectorClick: function(event)
      {
          if (WebInspector.KeyboardShortcut.eventHasCtrlOrMeta(/** @type {!MouseEvent} */(event)) && this.navigable && event.target.classList.contains("simple-selector")) {
              var index = event.target._selectorIndex;
              var cssModel = this._parentPane._cssModel;
              var rule = this.rule();
              var rawLocation = new WebInspector.CSSLocation(cssModel, /** @type {string} */(rule.styleSheetId), rule.sourceURL, rule.lineNumberInSource(index), rule.columnNumberInSource(index));
              var uiLocation = WebInspector.cssWorkspaceBinding.rawLocationToUILocation(rawLocation);
              if (uiLocation)
                  WebInspector.Revealer.reveal(uiLocation);
              event.consume(true);
              return;
          }
          this._startEditingOnMouseEvent();
          event.consume(true);
      },
  
      _startEditingOnMouseEvent: function()
      {
          if (!this.editable)
              return;
  
          if (!this.rule() && !this.propertiesTreeOutline.rootElement().childCount()) {
              this.addNewBlankProperty().startEditing();
              return;
          }
  
          if (!this.rule())
              return;
  
          this.startEditingSelector();
      },
  
      startEditingSelector: function()
      {
          var element = this._selectorElement;
          if (WebInspector.isBeingEdited(element))
              return;
  
          element.scrollIntoViewIfNeeded(false);
          element.textContent = element.textContent; // Reset selector marks in group.
  
          var config = new WebInspector.InplaceEditor.Config(this.editingSelectorCommitted.bind(this), this.editingSelectorCancelled.bind(this), undefined, this._editingSelectorBlurHandler.bind(this));
          WebInspector.InplaceEditor.startEditing(this._selectorElement, config);
  
          element.getComponentSelection().setBaseAndExtent(element, 0, element, 1);
          this._parentPane.setEditingStyle(true);
          this._parentPane._startEditingSelector(this);
      },
  
      /**
       * @param {string} text
       */
      setSelectorText: function(text)
      {
          this._selectorElement.textContent = text;
          this._selectorElement.getComponentSelection().setBaseAndExtent(this._selectorElement, 0, this._selectorElement, 1);
      },
  
      /**
       * @param {!Element} editor
       * @param {!Event} blurEvent
       * @return {boolean}
       */
      _editingSelectorBlurHandler: function(editor, blurEvent)
      {
          if (!blurEvent.relatedTarget)
              return true;
          var elementTreeOutline = blurEvent.relatedTarget.enclosingNodeOrSelfWithClass("elements-tree-outline");
          if (!elementTreeOutline)
              return true;
          editor.focus();
          return false;
      },
  
      /**
       * @param {string} moveDirection
       */
      _moveEditorFromSelector: function(moveDirection)
      {
          this._markSelectorMatches();
  
          if (!moveDirection)
              return;
  
          if (moveDirection === "forward") {
              var firstChild = this.propertiesTreeOutline.firstChild();
              while (firstChild && firstChild.inherited)
                  firstChild = firstChild.nextSibling;
              if (!firstChild)
                  this.addNewBlankProperty().startEditing();
              else
                  firstChild.startEditing(firstChild.nameElement);
          } else {
              var previousSection = this.previousEditableSibling();
              if (!previousSection)
                  return;
  
              previousSection.addNewBlankProperty().startEditing();
          }
      },
  
      /**
       * @param {!Element} element
       * @param {string} newContent
       * @param {string} oldContent
       * @param {(!WebInspector.StylePropertyTreeElement.Context|undefined)} context
       * @param {string} moveDirection
       */
      editingSelectorCommitted: function(element, newContent, oldContent, context, moveDirection)
      {
          this._editingSelectorEnded();
          if (newContent)
              newContent = newContent.trim();
          if (newContent === oldContent) {
              // Revert to a trimmed version of the selector if need be.
              this._selectorElement.textContent = newContent;
              this._moveEditorFromSelector(moveDirection);
              return;
          }
  
          /**
           * @param {!WebInspector.CSSRule} newRule
           * @this {WebInspector.StylePropertiesSection}
           */
          function successCallback(newRule)
          {
              var doesAffectSelectedNode = newRule.matchingSelectors.length > 0;
              this.element.classList.toggle("no-affect", !doesAffectSelectedNode);
  
              var oldSelectorRange = this.rule().selectorRange;
              this.styleRule.updateRule(newRule);
  
              this._parentPane._refreshUpdate(this);
              this._parentPane._styleSheetRuleEdited(newRule, oldSelectorRange, newRule.selectorRange);
  
              finishOperationAndMoveEditor.call(this, moveDirection);
          }
  
          /**
           * @param {string} direction
           * @this {WebInspector.StylePropertiesSection}
           */
          function finishOperationAndMoveEditor(direction)
          {
              delete this._parentPane._userOperation;
              this._moveEditorFromSelector(direction);
              this._editingSelectorCommittedForTest();
          }
  
          // This gets deleted in finishOperationAndMoveEditor(), which is called both on success and failure.
          this._parentPane._userOperation = true;
          var selectedNode = this._parentPane.node();
          this._parentPane._cssModel.setRuleSelector(this.rule(), selectedNode ? selectedNode.id : 0, newContent, successCallback.bind(this), finishOperationAndMoveEditor.bind(this, moveDirection));
      },
  
      _editingSelectorCommittedForTest: function() { },
  
      _updateRuleOrigin: function()
      {
          this._selectorRefElement.removeChildren();
          this._selectorRefElement.appendChild(WebInspector.StylePropertiesSection.createRuleOriginNode(this._parentPane._cssModel, this._parentPane._linkifier, this.rule()));
      },
  
      _editingSelectorEnded: function()
      {
          this._parentPane.setEditingStyle(false);
          this._parentPane._finishEditingSelector();
      },
  
      editingSelectorCancelled: function()
      {
          this._editingSelectorEnded();
  
          // Mark the selectors in group if necessary.
          // This is overridden by BlankStylePropertiesSection.
          this._markSelectorMatches();
      }
  }
  
  /**
   * @param {!WebInspector.CSSStyleModel} cssModel
   * @param {!WebInspector.Linkifier} linkifier
   * @param {?WebInspector.CSSRule} rule
   * @return {!Node}
   */
  WebInspector.StylePropertiesSection.createRuleOriginNode = function(cssModel, linkifier, rule)
  {
      if (!rule)
          return createTextNode("");
  
      var firstMatchingIndex = rule.matchingSelectors && rule.matchingSelectors.length ? rule.matchingSelectors[0] : 0;
      var ruleLocation = rule.selectors[firstMatchingIndex].range;
  
      var header = rule.styleSheetId ? cssModel.styleSheetHeaderForId(rule.styleSheetId) : null;
      if (ruleLocation && rule.styleSheetId && header && header.resourceURL())
          return WebInspector.StylePropertiesSection._linkifyRuleLocation(cssModel, linkifier, rule.styleSheetId, ruleLocation);
  
      if (rule.isUserAgent)
          return createTextNode(WebInspector.UIString("user agent stylesheet"));
      if (rule.isInjected)
          return createTextNode(WebInspector.UIString("injected stylesheet"));
      if (rule.isViaInspector)
          return createTextNode(WebInspector.UIString("via inspector"));
  
      if (header && header.ownerNode) {
          var link = WebInspector.DOMPresentationUtils.linkifyDeferredNodeReference(header.ownerNode);
          link.textContent = "<style>…</style>";
          return link;
      }
  
      return createTextNode("");
  }
  
  /**
   * @param {!WebInspector.CSSStyleModel} cssModel
   * @param {!WebInspector.Linkifier} linkifier
   * @param {string} styleSheetId
   * @param {!WebInspector.TextRange} ruleLocation
   * @return {!Node}
   */
  WebInspector.StylePropertiesSection._linkifyRuleLocation = function(cssModel, linkifier, styleSheetId, ruleLocation)
  {
      var styleSheetHeader = cssModel.styleSheetHeaderForId(styleSheetId);
      var sourceURL = styleSheetHeader.resourceURL();
      var lineNumber = styleSheetHeader.lineNumberInSource(ruleLocation.startLine);
      var columnNumber = styleSheetHeader.columnNumberInSource(ruleLocation.startLine, ruleLocation.startColumn);
      var matchingSelectorLocation = new WebInspector.CSSLocation(cssModel, styleSheetId, sourceURL, lineNumber, columnNumber);
      return linkifier.linkifyCSSLocation(matchingSelectorLocation);
  }
  
  /**
   * @constructor
   * @extends {WebInspector.StylePropertiesSection}
   * @param {!WebInspector.StylesSidebarPane} stylesPane
   * @param {string} defaultSelectorText
   * @param {string} styleSheetId
   * @param {!WebInspector.TextRange} ruleLocation
   * @param {!WebInspector.StylesSectionModel} insertAfterStyleRule
   */
  WebInspector.BlankStylePropertiesSection = function(stylesPane, defaultSelectorText, styleSheetId, ruleLocation, insertAfterStyleRule)
  {
      var dummyCascade = new WebInspector.SectionCascade();
      var blankSectionModel = dummyCascade.appendModelFromStyle(WebInspector.CSSStyleDeclaration.createDummyStyle(stylesPane._cssModel), defaultSelectorText);
      blankSectionModel.setEditable(true);
      WebInspector.StylePropertiesSection.call(this, stylesPane, blankSectionModel);
      this._ruleLocation = ruleLocation;
      this._styleSheetId = styleSheetId;
      this._selectorRefElement.removeChildren();
      this._selectorRefElement.appendChild(WebInspector.StylePropertiesSection._linkifyRuleLocation(this._parentPane._cssModel, this._parentPane._linkifier, styleSheetId, this._actualRuleLocation()));
      if (insertAfterStyleRule)
          this._createMediaList(insertAfterStyleRule.media());
      this._insertAfterStyleRule = insertAfterStyleRule;
      this.element.classList.add("blank-section");
  }
  
  WebInspector.BlankStylePropertiesSection.prototype = {
      /**
       * @return {!WebInspector.TextRange}
       */
      _actualRuleLocation: function()
      {
          var prefix = this._rulePrefix();
          var lines = prefix.split("\n");
          var editRange = new WebInspector.TextRange(0, 0, lines.length - 1, lines.peekLast().length);
          return this._ruleLocation.rebaseAfterTextEdit(WebInspector.TextRange.createFromLocation(0, 0), editRange);
      },
  
      /**
       * @return {string}
       */
      _rulePrefix: function()
      {
          return this._ruleLocation.startLine === 0 && this._ruleLocation.startColumn === 0 ? "" : "\n\n";
      },
  
      /**
       * @return {boolean}
       */
      get isBlank()
      {
          return !this._normal;
      },
  
      /**
       * @override
       * @param {!Element} element
       * @param {string} newContent
       * @param {string} oldContent
       * @param {!WebInspector.StylePropertyTreeElement.Context|undefined} context
       * @param {string} moveDirection
       */
      editingSelectorCommitted: function(element, newContent, oldContent, context, moveDirection)
      {
          if (!this.isBlank) {
              WebInspector.StylePropertiesSection.prototype.editingSelectorCommitted.call(this, element, newContent, oldContent, context, moveDirection);
              return;
          }
  
          /**
           * @param {!WebInspector.CSSRule} newRule
           * @this {WebInspector.StylePropertiesSection}
           */
          function successCallback(newRule)
          {
              var doesSelectorAffectSelectedNode = newRule.matchingSelectors.length > 0;
              this._makeNormal(newRule);
  
              if (!doesSelectorAffectSelectedNode)
                  this.element.classList.add("no-affect");
  
              var ruleTextLines = ruleText.split("\n");
              var startLine = this._ruleLocation.startLine;
              var startColumn = this._ruleLocation.startColumn;
              var newRange = new WebInspector.TextRange(startLine, startColumn, startLine + ruleTextLines.length - 1, startColumn + ruleTextLines[ruleTextLines.length - 1].length);
              this._parentPane._styleSheetRuleEdited(newRule, this._ruleLocation, newRange);
  
              this._updateRuleOrigin();
              if (this.element.parentElement) // Might have been detached already.
                  this._moveEditorFromSelector(moveDirection);
  
              delete this._parentPane._userOperation;
              this._editingSelectorEnded();
              this._markSelectorMatches();
  
              this._editingSelectorCommittedForTest();
          }
  
          /**
           * @this {WebInspector.StylePropertiesSection}
           */
          function failureCallback()
          {
              this.editingSelectorCancelled();
              this._editingSelectorCommittedForTest();
          }
  
          if (newContent)
              newContent = newContent.trim();
          this._parentPane._userOperation = true;
  
          var cssModel = this._parentPane._cssModel;
          var ruleText = this._rulePrefix() + newContent + " {}";
          cssModel.addRule(this._styleSheetId, this._parentPane.node(), ruleText, this._ruleLocation, successCallback.bind(this), failureCallback.bind(this));
      },
  
      editingSelectorCancelled: function()
      {
          delete this._parentPane._userOperation;
          if (!this.isBlank) {
              WebInspector.StylePropertiesSection.prototype.editingSelectorCancelled.call(this);
              return;
          }
  
          this._editingSelectorEnded();
          this._parentPane.removeSection(this);
      },
  
      /**
       * @param {!WebInspector.CSSRule} newRule
       */
      _makeNormal: function(newRule)
      {
          this.element.classList.remove("blank-section");
          var model = this._insertAfterStyleRule.cascade().insertModelFromRule(newRule, this._insertAfterStyleRule);
          this.styleRule = model;
  
          // FIXME: replace this instance by a normal WebInspector.StylePropertiesSection.
          this._normal = true;
      },
  
      __proto__: WebInspector.StylePropertiesSection.prototype
  }
  
  /**
   * @constructor
   * @extends {TreeElement}
   * @param {!WebInspector.StylesSectionModel} styleRule
   * @param {!WebInspector.CSSProperty} property
   * @param {boolean} inherited
   * @param {boolean} overloaded
   * @param {boolean} expandable
   */
  WebInspector.StylePropertyTreeElementBase = function(styleRule, property, inherited, overloaded, expandable)
  {
      this._styleRule = styleRule;
      this.property = property;
      this._inherited = inherited;
      this._overloaded = overloaded;
  
      // Pass an empty title, the title gets made later in onattach.
      TreeElement.call(this, "", expandable);
  
      this.selectable = false;
  }
  
  WebInspector.StylePropertyTreeElementBase.prototype = {
      /**
       * @return {!WebInspector.CSSStyleDeclaration}
       */
      style: function()
      {
          return this._styleRule.style();
      },
  
      /**
       * @return {?WebInspector.DOMNode}
       */
      node: function()
      {
          return null;  // Overridden by ancestors.
      },
  
      /**
       * @return {!WebInspector.StylesSidebarPane|!WebInspector.ComputedStyleSidebarPane}
       */
      parentPane: function()
      {
          throw "Not implemented";
      },
  
      get inherited()
      {
          return this._inherited;
      },
  
      /**
       * @return {boolean}
       */
      hasIgnorableError: function()
      {
          return !this.parsedOk && WebInspector.StylesSidebarPane.ignoreErrorsForProperty(this.property);
      },
  
      get overloaded()
      {
          return this._overloaded;
      },
  
      set overloaded(x)
      {
          if (x === this._overloaded)
              return;
          this._overloaded = x;
          this._updateState();
      },
  
      get disabled()
      {
          return this.property.disabled;
      },
  
      get name()
      {
          if (!this.disabled || !this.property.text)
              return this.property.name;
  
          var text = this.property.text;
          var index = text.indexOf(":");
          if (index < 1)
              return this.property.name;
  
          text = text.substring(0, index).trim();
          if (text.startsWith("/*"))
              text = text.substring(2).trim();
          return text;
      },
  
      get value()
      {
          if (!this.disabled || !this.property.text)
              return this.property.value;
  
          var match = this.property.text.match(/(.*);\s*/);
          if (!match || !match[1])
              return this.property.value;
  
          var text = match[1];
          var index = text.indexOf(":");
          if (index < 1)
              return this.property.value;
  
          return text.substring(index + 1).trim();
      },
  
      get parsedOk()
      {
          return this.property.parsedOk;
      },
  
      /**
       * @override
       */
      onattach: function()
      {
          this.updateTitle();
      },
  
      updateTitle: function()
      {
          this._updateState();
          this._expandElement = createElement("span");
          this._expandElement.className = "expand-element";
  
          var propertyRenderer = new WebInspector.StylesSidebarPropertyRenderer(this._styleRule.rule(), this.node(), this.name, this.value);
          if (this.parsedOk) {
              propertyRenderer.setColorHandler(this._processColor.bind(this));
              propertyRenderer.setBezierHandler(this._processBezier.bind(this));
          }
  
          this.listItemElement.removeChildren();
          this.nameElement = propertyRenderer.renderName();
          this.nameElement.title = this.property.propertyText;
          this.valueElement = propertyRenderer.renderValue();
          if (!this.treeOutline)
              return;
  
          this.listItemElement.createChild("span", "styles-clipboard-only").createTextChild(this.disabled ? "  /* " : "  ");
          this.listItemElement.appendChild(this.nameElement);
          this.listItemElement.createTextChild(": ");
          this.listItemElement.appendChild(this._expandElement);
          this.listItemElement.appendChild(this.valueElement);
          this.listItemElement.createTextChild(";");
          if (this.disabled)
              this.listItemElement.createChild("span", "styles-clipboard-only").createTextChild(" */");
  
          if (!this.parsedOk) {
              // Avoid having longhands under an invalid shorthand.
              this.listItemElement.classList.add("not-parsed-ok");
  
              // Add a separate exclamation mark IMG element with a tooltip.
              this.listItemElement.insertBefore(WebInspector.StylesSidebarPane.createExclamationMark(this.property), this.listItemElement.firstChild);
          }
          if (this.property.inactive)
              this.listItemElement.classList.add("inactive");
          this._updateFilter();
      },
  
      /**
       * @return {boolean}
       */
      _updateFilter: function()
      {
          var regex = this.parentPane().filterRegex();
          var matches = !!regex && (regex.test(this.property.name) || regex.test(this.property.value));
          this.listItemElement.classList.toggle("filter-match", matches);
  
          this.onpopulate();
          var hasMatchingChildren = false;
          for (var i = 0; i < this.childCount(); ++i)
              hasMatchingChildren |= this.childAt(i)._updateFilter();
  
          if (!regex) {
              if (this._expandedDueToFilter)
                  this.collapse();
              this._expandedDueToFilter = false;
          } else if (hasMatchingChildren && !this.expanded) {
              this.expand();
              this._expandedDueToFilter = true;
          } else if (!hasMatchingChildren && this.expanded && this._expandedDueToFilter) {
              this.collapse();
              this._expandedDueToFilter = false;
          }
          return matches;
      },
  
      /**
       * @param {string} text
       * @return {!Node}
       */
      _processColor: function(text)
      {
          // We can be called with valid non-color values of |text| (like 'none' from border style)
          var color = WebInspector.Color.parse(text);
          if (!color)
              return createTextNode(text);
  
          if (!this._styleRule.editable()) {
              var swatch = WebInspector.ColorSwatch.create();
              swatch.setColorText(text);
              return swatch;
          }
  
          var stylesPopoverHelper = this.parentPane()._stylesPopoverHelper;
          return new WebInspector.ColowSwatchPopoverIcon(this, stylesPopoverHelper, text).element();
      },
  
      /**
       * @return {string}
       */
      renderedPropertyText: function()
      {
          return this.nameElement.textContent + ": " + this.valueElement.textContent;
      },
  
      /**
       * @param {string} text
       * @return {!Node}
       */
      _processBezier: function(text)
      {
          var geometry = WebInspector.Geometry.CubicBezier.parse(text);
          if (!geometry || !this._styleRule.editable())
              return createTextNode(text);
          var stylesPopoverHelper = this.parentPane()._stylesPopoverHelper;
          return new WebInspector.BezierPopoverIcon(this, stylesPopoverHelper, text).element();
      },
  
      _updateState: function()
      {
          if (!this.listItemElement)
              return;
  
          if (this.style().isPropertyImplicit(this.name))
              this.listItemElement.classList.add("implicit");
          else
              this.listItemElement.classList.remove("implicit");
  
          if (this.hasIgnorableError())
              this.listItemElement.classList.add("has-ignorable-error");
          else
              this.listItemElement.classList.remove("has-ignorable-error");
  
          if (this.inherited)
              this.listItemElement.classList.add("inherited");
          else
              this.listItemElement.classList.remove("inherited");
  
          if (this.overloaded)
              this.listItemElement.classList.add("overloaded");
          else
              this.listItemElement.classList.remove("overloaded");
  
          if (this.disabled)
              this.listItemElement.classList.add("disabled");
          else
              this.listItemElement.classList.remove("disabled");
      },
  
      __proto__: TreeElement.prototype
  }
  
  /**
   * @constructor
   * @extends {WebInspector.StylePropertyTreeElementBase}
   * @param {!WebInspector.StylesSidebarPane} stylesPane
   * @param {!WebInspector.StylesSectionModel} styleRule
   * @param {!WebInspector.CSSProperty} property
   * @param {boolean} isShorthand
   * @param {boolean} inherited
   * @param {boolean} overloaded
   */
  WebInspector.StylePropertyTreeElement = function(stylesPane, styleRule, property, isShorthand, inherited, overloaded)
  {
      WebInspector.StylePropertyTreeElementBase.call(this, styleRule, property, inherited, overloaded, isShorthand);
      this._parentPane = stylesPane;
      this.isShorthand = isShorthand;
      this._applyStyleThrottler = new WebInspector.Throttler(0);
  }
  
  /** @typedef {{expanded: boolean, hasChildren: boolean, isEditingName: boolean, previousContent: string}} */
  WebInspector.StylePropertyTreeElement.Context;
  
  WebInspector.StylePropertyTreeElement.prototype = {
      /**
       * @override
       * @return {?WebInspector.DOMNode}
       */
      node: function()
      {
          return this._parentPane.node();
      },
  
      /**
       * @override
       * @return {!WebInspector.StylesSidebarPane}
       */
      parentPane: function()
      {
          return this._parentPane;
      },
  
      /**
       * @return {?WebInspector.StylePropertiesSection}
       */
      section: function()
      {
          return this.treeOutline && this.treeOutline.section;
      },
  
      _updatePane: function()
      {
          var section = this.section();
          if (section && section._parentPane)
              section._parentPane._refreshUpdate(section);
      },
  
      /**
       * @param {!WebInspector.CSSStyleDeclaration} newStyle
       */
      _applyNewStyle: function(newStyle)
      {
          var oldStyleRange = /** @type {!WebInspector.TextRange} */ (this.style().range);
          var newStyleRange = /** @type {!WebInspector.TextRange} */ (newStyle.range);
          this._styleRule.updateStyleDeclaration(newStyle);
          if (this._styleRule.rule())
              this._parentPane._styleSheetRuleEdited(/** @type {!WebInspector.CSSRule} */(this._styleRule.rule()), oldStyleRange, newStyleRange);
      },
  
      /**
       * @param {!Event} event
       */
      toggleEnabled: function(event)
      {
          var disabled = !event.target.checked;
  
          /**
           * @param {?WebInspector.CSSStyleDeclaration} newStyle
           * @this {WebInspector.StylePropertyTreeElement}
           */
          function callback(newStyle)
          {
              delete this._parentPane._userOperation;
  
              if (!newStyle)
                  return;
              this._applyNewStyle(newStyle);
  
              this._updatePane();
              this.styleTextAppliedForTest();
          }
  
          this._parentPane._userOperation = true;
          this.property.setDisabled(disabled, callback.bind(this));
          event.consume();
      },
  
      onpopulate: function()
      {
          // Only populate once and if this property is a shorthand.
          if (this.childCount() || !this.isShorthand)
              return;
  
          var longhandProperties = this.style().longhandProperties(this.name);
          for (var i = 0; i < longhandProperties.length; ++i) {
              var name = longhandProperties[i].name;
              var inherited = false;
              var overloaded = false;
  
              var section = this.section();
              if (section) {
                  inherited = section.isPropertyInherited(name);
                  overloaded = section.styleRule.isPropertyOverloaded(name);
              }
  
              var liveProperty = this.style().getLiveProperty(name);
              if (!liveProperty)
                  continue;
  
              var item = new WebInspector.StylePropertyTreeElement(this._parentPane, this._styleRule, liveProperty, false, inherited, overloaded);
              this.appendChild(item);
          }
      },
  
      onattach: function()
      {
          WebInspector.StylePropertyTreeElementBase.prototype.onattach.call(this);
  
          this.listItemElement.addEventListener("mousedown", this._mouseDown.bind(this));
          this.listItemElement.addEventListener("mouseup", this._resetMouseDownElement.bind(this));
          this.listItemElement.addEventListener("click", this._mouseClick.bind(this));
      },
  
      /**
       * @param {!Event} event
       */
      _mouseDown: function(event)
      {
          if (this._parentPane) {
              this._parentPane._mouseDownTreeElement = this;
              this._parentPane._mouseDownTreeElementIsName = this._isNameElement(/** @type {!Element} */(event.target));
              this._parentPane._mouseDownTreeElementIsValue = this._isValueElement(/** @type {!Element} */(event.target));
          }
      },
  
      _resetMouseDownElement: function()
      {
          if (this._parentPane) {
              delete this._parentPane._mouseDownTreeElement;
              delete this._parentPane._mouseDownTreeElementIsName;
              delete this._parentPane._mouseDownTreeElementIsValue;
          }
      },
  
      updateTitle: function()
      {
          WebInspector.StylePropertyTreeElementBase.prototype.updateTitle.call(this);
  
          if (this.parsedOk && this.section() && this.parent.root) {
              var enabledCheckboxElement = createElement("input");
              enabledCheckboxElement.className = "enabled-button";
              enabledCheckboxElement.type = "checkbox";
              enabledCheckboxElement.checked = !this.disabled;
              enabledCheckboxElement.addEventListener("click", this.toggleEnabled.bind(this), false);
              this.listItemElement.insertBefore(enabledCheckboxElement, this.listItemElement.firstChild);
          }
      },
  
      /**
       * @param {!Event} event
       */
      _mouseClick: function(event)
      {
          if (!event.target.isComponentSelectionCollapsed())
              return;
  
          event.consume(true);
  
          if (event.target === this.listItemElement) {
              var section = this.section();
              if (!section || !section.editable)
                  return;
  
              if (section._checkWillCancelEditing())
                  return;
              section.addNewBlankProperty(this.property.index + 1).startEditing();
              return;
          }
  
          if (WebInspector.KeyboardShortcut.eventHasCtrlOrMeta(/** @type {!MouseEvent} */(event)) && this.section().navigable) {
              this._navigateToSource(/** @type {!Element} */(event.target));
              return;
          }
  
          this.startEditing(/** @type {!Element} */(event.target));
      },
  
      /**
       * @param {!Element} element
       */
      _navigateToSource: function(element)
      {
          console.assert(this.section().navigable);
          var propertyNameClicked = element === this.nameElement;
          var uiLocation = WebInspector.cssWorkspaceBinding.propertyUILocation(this.property, propertyNameClicked);
          if (uiLocation)
              WebInspector.Revealer.reveal(uiLocation);
      },
  
      /**
       * @param {!Element} element
       * @return {boolean}
       */
      _isNameElement: function(element)
      {
          return element.enclosingNodeOrSelfWithClass("webkit-css-property") === this.nameElement;
      },
  
      /**
       * @param {!Element} element
       * @return {boolean}
       */
      _isValueElement: function(element)
      {
          return !!element.enclosingNodeOrSelfWithClass("value");
      },
  
      /**
       * @param {?Element=} selectElement
       */
      startEditing: function(selectElement)
      {
          // FIXME: we don't allow editing of longhand properties under a shorthand right now.
          if (this.parent.isShorthand)
              return;
  
          if (selectElement === this._expandElement)
              return;
  
          var section = this.section();
          if (section && !section.editable)
              return;
  
          if (!selectElement)
              selectElement = this.nameElement; // No arguments passed in - edit the name element by default.
          else
              selectElement = selectElement.enclosingNodeOrSelfWithClass("webkit-css-property") || selectElement.enclosingNodeOrSelfWithClass("value");
  
          if (WebInspector.isBeingEdited(selectElement))
              return;
  
          var isEditingName = selectElement === this.nameElement;
          if (!isEditingName)
              this.valueElement.textContent = restoreURLs(this.valueElement.textContent, this.value);
  
          /**
           * @param {string} fieldValue
           * @param {string} modelValue
           * @return {string}
           */
          function restoreURLs(fieldValue, modelValue)
          {
              const urlRegex = /\b(url\([^)]*\))/g;
              var splitFieldValue = fieldValue.split(urlRegex);
              if (splitFieldValue.length === 1)
                  return fieldValue;
              var modelUrlRegex = new RegExp(urlRegex);
              for (var i = 1; i < splitFieldValue.length; i += 2) {
                  var match = modelUrlRegex.exec(modelValue);
                  if (match)
                      splitFieldValue[i] = match[0];
              }
              return splitFieldValue.join("");
          }
  
          /** @type {!WebInspector.StylePropertyTreeElement.Context} */
          var context = {
              expanded: this.expanded,
              hasChildren: this.isExpandable(),
              isEditingName: isEditingName,
              previousContent: selectElement.textContent
          };
  
          // Lie about our children to prevent expanding on double click and to collapse shorthands.
          this.setExpandable(false);
  
          if (selectElement.parentElement)
              selectElement.parentElement.classList.add("child-editing");
          selectElement.textContent = selectElement.textContent; // remove color swatch and the like
  
          /**
           * @param {!WebInspector.StylePropertyTreeElement.Context} context
           * @param {!Event} event
           * @this {WebInspector.StylePropertyTreeElement}
           */
          function pasteHandler(context, event)
          {
              var data = event.clipboardData.getData("Text");
              if (!data)
                  return;
              var colonIdx = data.indexOf(":");
              if (colonIdx < 0)
                  return;
              var name = data.substring(0, colonIdx).trim();
              var value = data.substring(colonIdx + 1).trim();
  
              event.preventDefault();
  
              if (!("originalName" in context)) {
                  context.originalName = this.nameElement.textContent;
                  context.originalValue = this.valueElement.textContent;
              }
              this.property.name = name;
              this.property.value = value;
              this.nameElement.textContent = name;
              this.valueElement.textContent = value;
              this.nameElement.normalize();
              this.valueElement.normalize();
  
              this.editingCommitted(event.target.textContent, context, "forward");
          }
  
          /**
           * @param {!WebInspector.StylePropertyTreeElement.Context} context
           * @param {!Event} event
           * @this {WebInspector.StylePropertyTreeElement}
           */
          function blurListener(context, event)
          {
              var treeElement = this._parentPane._mouseDownTreeElement;
              var moveDirection = "";
              if (treeElement === this) {
                  if (isEditingName && this._parentPane._mouseDownTreeElementIsValue)
                      moveDirection = "forward";
                  if (!isEditingName && this._parentPane._mouseDownTreeElementIsName)
                      moveDirection = "backward";
              }
              this.editingCommitted(event.target.textContent, context, moveDirection);
          }
  
          this._originalPropertyText = this.property.propertyText;
  
          this._parentPane.setEditingStyle(true);
          if (selectElement.parentElement)
              selectElement.parentElement.scrollIntoViewIfNeeded(false);
  
          var applyItemCallback = !isEditingName ? this._applyFreeFlowStyleTextEdit.bind(this) : undefined;
          this._prompt = new WebInspector.StylesSidebarPane.CSSPropertyPrompt(isEditingName ? WebInspector.CSSMetadata.cssPropertiesMetainfo : WebInspector.CSSMetadata.keywordsForProperty(this.nameElement.textContent), this, isEditingName);
          this._prompt.setAutocompletionTimeout(0);
          if (applyItemCallback) {
              this._prompt.addEventListener(WebInspector.TextPrompt.Events.ItemApplied, applyItemCallback, this);
              this._prompt.addEventListener(WebInspector.TextPrompt.Events.ItemAccepted, applyItemCallback, this);
          }
          var proxyElement = this._prompt.attachAndStartEditing(selectElement, blurListener.bind(this, context));
  
          proxyElement.addEventListener("keydown", this._editingNameValueKeyDown.bind(this, context), false);
          proxyElement.addEventListener("keypress", this._editingNameValueKeyPress.bind(this, context), false);
          proxyElement.addEventListener("input", this._editingNameValueInput.bind(this, context), false);
          if (isEditingName)
              proxyElement.addEventListener("paste", pasteHandler.bind(this, context), false);
  
          selectElement.getComponentSelection().setBaseAndExtent(selectElement, 0, selectElement, 1);
      },
  
      /**
       * @param {!WebInspector.StylePropertyTreeElement.Context} context
       * @param {!Event} event
       */
      _editingNameValueKeyDown: function(context, event)
      {
          if (event.handled)
              return;
  
          var result;
  
          if (isEnterKey(event)) {
              event.preventDefault();
              result = "forward";
          } else if (event.keyCode === WebInspector.KeyboardShortcut.Keys.Esc.code || event.keyIdentifier === "U+001B")
              result = "cancel";
          else if (!context.isEditingName && this._newProperty && event.keyCode === WebInspector.KeyboardShortcut.Keys.Backspace.code) {
              // For a new property, when Backspace is pressed at the beginning of new property value, move back to the property name.
              var selection = event.target.getComponentSelection();
              if (selection.isCollapsed && !selection.focusOffset) {
                  event.preventDefault();
                  result = "backward";
              }
          } else if (event.keyIdentifier === "U+0009") { // Tab key.
              result = event.shiftKey ? "backward" : "forward";
              event.preventDefault();
          }
  
          if (result) {
              switch (result) {
              case "cancel":
                  this.editingCancelled(null, context);
                  break;
              case "forward":
              case "backward":
                  this.editingCommitted(event.target.textContent, context, result);
                  break;
              }
  
              event.consume();
              return;
          }
      },
  
      /**
       * @param {!WebInspector.StylePropertyTreeElement.Context} context
       * @param {!Event} event
       */
      _editingNameValueKeyPress: function(context, event)
      {
          /**
           * @param {string} text
           * @param {number} cursorPosition
           * @return {boolean}
           */
          function shouldCommitValueSemicolon(text, cursorPosition)
          {
              // FIXME: should this account for semicolons inside comments?
              var openQuote = "";
              for (var i = 0; i < cursorPosition; ++i) {
                  var ch = text[i];
                  if (ch === "\\" && openQuote !== "")
                      ++i; // skip next character inside string
                  else if (!openQuote && (ch === "\"" || ch === "'"))
                      openQuote = ch;
                  else if (openQuote === ch)
                      openQuote = "";
              }
              return !openQuote;
          }
  
          var keyChar = String.fromCharCode(event.charCode);
          var isFieldInputTerminated = (context.isEditingName ? keyChar === ":" : keyChar === ";" && shouldCommitValueSemicolon(event.target.textContent, event.target.selectionLeftOffset()));
          if (isFieldInputTerminated) {
              // Enter or colon (for name)/semicolon outside of string (for value).
              event.consume(true);
              this.editingCommitted(event.target.textContent, context, "forward");
              return;
          }
      },
  
      /**
       * @param {!WebInspector.StylePropertyTreeElement.Context} context
       * @param {!Event} event
       */
      _editingNameValueInput: function(context, event)
      {
          // Do not live-edit "content" property of pseudo elements. crbug.com/433889
          if (!context.isEditingName && (!this._parentPane.node().pseudoType() || this.name !== "content"))
              this._applyFreeFlowStyleTextEdit();
      },
  
      _applyFreeFlowStyleTextEdit: function()
      {
          var valueText = this.valueElement.textContent;
          if (valueText.indexOf(";") === -1)
              this.applyStyleText(this.nameElement.textContent + ": " + valueText, false);
      },
  
      kickFreeFlowStyleEditForTest: function()
      {
          this._applyFreeFlowStyleTextEdit();
      },
  
      /**
       * @param {!WebInspector.StylePropertyTreeElement.Context} context
       */
      editingEnded: function(context)
      {
          delete this._originalPropertyText;
          this._resetMouseDownElement();
  
          this.setExpandable(context.hasChildren);
          if (context.expanded)
              this.expand();
          var editedElement = context.isEditingName ? this.nameElement : this.valueElement;
          // The proxyElement has been deleted, no need to remove listener.
          if (editedElement.parentElement)
              editedElement.parentElement.classList.remove("child-editing");
  
          this._parentPane.setEditingStyle(false);
      },
  
      /**
       * @param {?Element} element
       * @param {!WebInspector.StylePropertyTreeElement.Context} context
       */
      editingCancelled: function(element, context)
      {
          this._removePrompt();
          this._revertStyleUponEditingCanceled();
          // This should happen last, as it clears the info necessary to restore the property value after [Page]Up/Down changes.
          this.editingEnded(context);
      },
  
      _revertStyleUponEditingCanceled: function()
      {
          if (this._propertyHasBeenEditedIncrementally)
              this.applyStyleText(this._originalPropertyText, false);
          else if (this._newProperty)
              this.treeOutline.removeChild(this);
          else
              this.updateTitle();
      },
  
      /**
       * @param {string} moveDirection
       * @return {?WebInspector.StylePropertyTreeElement}
       */
      _findSibling: function(moveDirection)
      {
          var target = this;
          do {
              target = (moveDirection === "forward" ? target.nextSibling : target.previousSibling);
          } while(target && target.inherited);
  
          return target;
      },
  
      /**
       * @param {string} userInput
       * @param {!WebInspector.StylePropertyTreeElement.Context} context
       * @param {string} moveDirection
       */
      editingCommitted: function(userInput, context, moveDirection)
      {
          this._removePrompt();
          this.editingEnded(context);
          var isEditingName = context.isEditingName;
  
          // Determine where to move to before making changes
          var createNewProperty, moveToPropertyName, moveToSelector;
          var isDataPasted = "originalName" in context;
          var isDirtyViaPaste = isDataPasted && (this.nameElement.textContent !== context.originalName || this.valueElement.textContent !== context.originalValue);
          var isPropertySplitPaste = isDataPasted && isEditingName && this.valueElement.textContent !== context.originalValue;
          var moveTo = this;
          var moveToOther = (isEditingName ^ (moveDirection === "forward"));
          var abandonNewProperty = this._newProperty && !userInput && (moveToOther || isEditingName);
          if (moveDirection === "forward" && (!isEditingName || isPropertySplitPaste) || moveDirection === "backward" && isEditingName) {
              moveTo = moveTo._findSibling(moveDirection);
              if (moveTo)
                  moveToPropertyName = moveTo.name;
              else if (moveDirection === "forward" && (!this._newProperty || userInput))
                  createNewProperty = true;
              else if (moveDirection === "backward")
                  moveToSelector = true;
          }
  
          // Make the Changes and trigger the moveToNextCallback after updating.
          var moveToIndex = moveTo && this.treeOutline ? this.treeOutline.rootElement().indexOfChild(moveTo) : -1;
          var blankInput = /^\s*$/.test(userInput);
          var shouldCommitNewProperty = this._newProperty && (isPropertySplitPaste || moveToOther || (!moveDirection && !isEditingName) || (isEditingName && blankInput));
          var section = /** @type {!WebInspector.StylePropertiesSection} */(this.section());
          if (((userInput !== context.previousContent || isDirtyViaPaste) && !this._newProperty) || shouldCommitNewProperty) {
              section._afterUpdate = moveToNextCallback.bind(this, this._newProperty, !blankInput, section);
              var propertyText;
              if (blankInput || (this._newProperty && /^\s*$/.test(this.valueElement.textContent)))
                  propertyText = "";
              else {
                  if (isEditingName)
                      propertyText = userInput + ": " + this.property.value;
                  else
                      propertyText = this.property.name + ": " + userInput;
              }
              this.applyStyleText(propertyText, true);
          } else {
              if (isEditingName)
                  this.property.name = userInput;
              else
                  this.property.value = userInput;
              if (!isDataPasted && !this._newProperty)
                  this.updateTitle();
              moveToNextCallback.call(this, this._newProperty, false, section);
          }
  
          /**
           * The Callback to start editing the next/previous property/selector.
           * @param {boolean} alreadyNew
           * @param {boolean} valueChanged
           * @param {!WebInspector.StylePropertiesSection} section
           * @this {WebInspector.StylePropertyTreeElement}
           */
          function moveToNextCallback(alreadyNew, valueChanged, section)
          {
              if (!moveDirection)
                  return;
  
              // User just tabbed through without changes.
              if (moveTo && moveTo.parent) {
                  moveTo.startEditing(!isEditingName ? moveTo.nameElement : moveTo.valueElement);
                  return;
              }
  
              // User has made a change then tabbed, wiping all the original treeElements.
              // Recalculate the new treeElement for the same property we were going to edit next.
              if (moveTo && !moveTo.parent) {
                  var rootElement = section.propertiesTreeOutline.rootElement();
                  if (moveDirection === "forward" && blankInput && !isEditingName)
                      --moveToIndex;
                  if (moveToIndex >= rootElement.childCount() && !this._newProperty)
                      createNewProperty = true;
                  else {
                      var treeElement = moveToIndex >= 0 ? rootElement.childAt(moveToIndex) : null;
                      if (treeElement) {
                          var elementToEdit = !isEditingName || isPropertySplitPaste ? treeElement.nameElement : treeElement.valueElement;
                          if (alreadyNew && blankInput)
                              elementToEdit = moveDirection === "forward" ? treeElement.nameElement : treeElement.valueElement;
                          treeElement.startEditing(elementToEdit);
                          return;
                      } else if (!alreadyNew)
                          moveToSelector = true;
                  }
              }
  
              // Create a new attribute in this section (or move to next editable selector if possible).
              if (createNewProperty) {
                  if (alreadyNew && !valueChanged && (isEditingName ^ (moveDirection === "backward")))
                      return;
  
                  section.addNewBlankProperty().startEditing();
                  return;
              }
  
              if (abandonNewProperty) {
                  moveTo = this._findSibling(moveDirection);
                  var sectionToEdit = (moveTo || moveDirection === "backward") ? section : section.nextEditableSibling();
                  if (sectionToEdit) {
                      if (sectionToEdit.rule())
                          sectionToEdit.startEditingSelector();
                      else
                          sectionToEdit._moveEditorFromSelector(moveDirection);
                  }
                  return;
              }
  
              if (moveToSelector) {
                  if (section.rule())
                      section.startEditingSelector();
                  else
                      section._moveEditorFromSelector(moveDirection);
              }
          }
      },
  
      _removePrompt: function()
      {
          // BUG 53242. This cannot go into editingEnded(), as it should always happen first for any editing outcome.
          if (this._prompt) {
              this._prompt.detach();
              delete this._prompt;
          }
      },
  
      styleTextAppliedForTest: function() { },
  
      /**
       * @param {string} styleText
       * @param {boolean} majorChange
       */
      applyStyleText: function(styleText, majorChange)
      {
          this._applyStyleThrottler.schedule(this._innerApplyStyleText.bind(this, styleText, majorChange));
      },
  
      /**
       * @param {string} styleText
       * @param {boolean} majorChange
       * @param {!WebInspector.Throttler.FinishCallback} finishedCallback
       */
      _innerApplyStyleText: function(styleText, majorChange, finishedCallback)
      {
          if (!this.treeOutline) {
              finishedCallback();
              return;
          }
  
          styleText = styleText.replace(/\s/g, " ").trim(); // Replace &nbsp; with whitespace.
          if (!styleText.length && majorChange && this._newProperty && !this._propertyHasBeenEditedIncrementally) {
              // The user deleted everything and never applied a new property value via Up/Down scrolling/live editing, so remove the tree element and update.
              var section = this.section();
              this.parent.removeChild(this);
              section.afterUpdate();
              return;
          }
  
          var currentNode = this._parentPane.node();
          this._parentPane._userOperation = true;
  
          /**
           * @param {?WebInspector.CSSStyleDeclaration} newStyle
           * @this {WebInspector.StylePropertyTreeElement}
           */
          function callback(newStyle)
          {
              delete this._parentPane._userOperation;
  
              if (!newStyle) {
                  if (majorChange) {
                      // It did not apply, cancel editing.
                      this._revertStyleUponEditingCanceled();
                  }
                  finishedCallback();
                  this.styleTextAppliedForTest();
                  return;
              }
              this._applyNewStyle(newStyle);
  
              this._propertyHasBeenEditedIncrementally = true;
              this.property = newStyle.propertyAt(this.property.index);
  
              // We are happy to update UI if user is not editing.
              if (!this._parentPane._isEditingStyle && currentNode === this.node())
                  this._updatePane();
  
              finishedCallback();
              this.styleTextAppliedForTest();
          }
  
          // Append a ";" if the new text does not end in ";".
          // FIXME: this does not handle trailing comments.
          if (styleText.length && !/;\s*$/.test(styleText))
              styleText += ";";
          var overwriteProperty = !this._newProperty || this._propertyHasBeenEditedIncrementally;
          this.property.setText(styleText, majorChange, overwriteProperty, callback.bind(this));
      },
  
      /**
       * @override
       * @return {boolean}
       */
      ondblclick: function()
      {
          return true; // handled
      },
  
      /**
       * @override
       * @param {!Event} event
       * @return {boolean}
       */
      isEventWithinDisclosureTriangle: function(event)
      {
          return event.target === this._expandElement;
      },
  
      __proto__: WebInspector.StylePropertyTreeElementBase.prototype
  }
  
  /**
   * @constructor
   * @extends {WebInspector.TextPrompt}
   * @param {!WebInspector.CSSMetadata} cssCompletions
   * @param {!WebInspector.StylePropertyTreeElement} treeElement
   * @param {boolean} isEditingName
   */
  WebInspector.StylesSidebarPane.CSSPropertyPrompt = function(cssCompletions, treeElement, isEditingName)
  {
      // Use the same callback both for applyItemCallback and acceptItemCallback.
      WebInspector.TextPrompt.call(this, this._buildPropertyCompletions.bind(this), WebInspector.StyleValueDelimiters);
      this.setSuggestBoxEnabled(true);
      this._cssCompletions = cssCompletions;
      this._treeElement = treeElement;
      this._isEditingName = isEditingName;
  
      if (!isEditingName)
          this.disableDefaultSuggestionForEmptyInput();
  }
  
  WebInspector.StylesSidebarPane.CSSPropertyPrompt.prototype = {
      /**
       * @override
       * @param {!Event} event
       */
      onKeyDown: function(event)
      {
          switch (event.keyIdentifier) {
          case "Up":
          case "Down":
          case "PageUp":
          case "PageDown":
              if (this._handleNameOrValueUpDown(event)) {
                  event.preventDefault();
                  return;
              }
              break;
          case "Enter":
              if (this.autoCompleteElement && !this.autoCompleteElement.textContent.length) {
                  this.tabKeyPressed();
                  return;
              }
              break;
          }
  
          WebInspector.TextPrompt.prototype.onKeyDown.call(this, event);
      },
  
      /**
       * @override
       * @param {!Event} event
       */
      onMouseWheel: function(event)
      {
          if (this._handleNameOrValueUpDown(event)) {
              event.consume(true);
              return;
          }
          WebInspector.TextPrompt.prototype.onMouseWheel.call(this, event);
      },
  
      /**
       * @override
       * @return {boolean}
       */
      tabKeyPressed: function()
      {
          this.acceptAutoComplete();
  
          // Always tab to the next field.
          return false;
      },
  
      /**
       * @param {!Event} event
       * @return {boolean}
       */
      _handleNameOrValueUpDown: function(event)
      {
          /**
           * @param {string} originalValue
           * @param {string} replacementString
           * @this {WebInspector.StylesSidebarPane.CSSPropertyPrompt}
           */
          function finishHandler(originalValue, replacementString)
          {
              // Synthesize property text disregarding any comments, custom whitespace etc.
              this._treeElement.applyStyleText(this._treeElement.nameElement.textContent + ": " + this._treeElement.valueElement.textContent, false);
          }
  
          /**
           * @param {string} prefix
           * @param {number} number
           * @param {string} suffix
           * @return {string}
           * @this {WebInspector.StylesSidebarPane.CSSPropertyPrompt}
           */
          function customNumberHandler(prefix, number, suffix)
          {
              if (number !== 0 && !suffix.length && WebInspector.CSSMetadata.isLengthProperty(this._treeElement.property.name))
                  suffix = "px";
              return prefix + number + suffix;
          }
  
          // Handle numeric value increment/decrement only at this point.
          if (!this._isEditingName && WebInspector.handleElementValueModifications(event, this._treeElement.valueElement, finishHandler.bind(this), this._isValueSuggestion.bind(this), customNumberHandler.bind(this)))
              return true;
  
          return false;
      },
  
      /**
       * @param {string} word
       * @return {boolean}
       */
      _isValueSuggestion: function(word)
      {
          if (!word)
              return false;
          word = word.toLowerCase();
          return this._cssCompletions.keySet().hasOwnProperty(word);
      },
  
      /**
       * @param {!Element} proxyElement
       * @param {!Range} wordRange
       * @param {boolean} force
       * @param {function(!Array.<string>, number=)} completionsReadyCallback
       */
      _buildPropertyCompletions: function(proxyElement, wordRange, force, completionsReadyCallback)
      {
          var prefix = wordRange.toString().toLowerCase();
          if (!prefix && !force && (this._isEditingName || proxyElement.textContent.length)) {
              completionsReadyCallback([]);
              return;
          }
  
          var results = this._cssCompletions.startsWith(prefix);
          if (!this._isEditingName && !results.length && prefix.length > 1 && "!important".startsWith(prefix))
              results.push("!important");
          var userEnteredText = wordRange.toString().replace("-", "");
          if (userEnteredText && (userEnteredText === userEnteredText.toUpperCase())) {
              for (var i = 0; i < results.length; ++i)
                  results[i] = results[i].toUpperCase();
          }
          var selectedIndex = this._cssCompletions.mostUsedOf(results);
          completionsReadyCallback(results, selectedIndex);
      },
  
      __proto__: WebInspector.TextPrompt.prototype
  }
  
  /**
   * @constructor
   * @param {?WebInspector.CSSRule} rule
   * @param {?WebInspector.DOMNode} node
   * @param {string} name
   * @param {string} value
   */
  WebInspector.StylesSidebarPropertyRenderer = function(rule, node, name, value)
  {
      this._rule = rule;
      this._node = node;
      this._propertyName = name;
      this._propertyValue = value;
  }
  
  WebInspector.StylesSidebarPropertyRenderer._colorRegex = /((?:rgb|hsl)a?\([^)]+\)|#[0-9a-fA-F]{6}|#[0-9a-fA-F]{3}|\b\w+\b(?!-))/g;
  WebInspector.StylesSidebarPropertyRenderer._bezierRegex = /((cubic-bezier\([^)]+\))|\b(linear|ease-in-out|ease-in|ease-out|ease)\b)/g;
  
  /**
   * @param {string} value
   * @return {!RegExp}
   */
  WebInspector.StylesSidebarPropertyRenderer._urlRegex = function(value)
  {
      // Heuristically choose between single-quoted, double-quoted or plain URL regex.
      if (/url\(\s*'.*\s*'\s*\)/.test(value))
          return /url\(\s*('.+')\s*\)/g;
      if (/url\(\s*".*\s*"\s*\)/.test(value))
          return /url\(\s*(".+")\s*\)/g;
      return /url\(\s*([^)]+)\s*\)/g;
  }
  
  WebInspector.StylesSidebarPropertyRenderer.prototype = {
      /**
       * @param {function(string):!Node} handler
       */
      setColorHandler: function(handler)
      {
          this._colorHandler = handler;
      },
  
      /**
       * @param {function(string):!Node} handler
       */
      setBezierHandler: function(handler)
      {
          this._bezierHandler = handler;
      },
  
      /**
       * @return {!Element}
       */
      renderName: function()
      {
          var nameElement = createElement("span");
          nameElement.className = "webkit-css-property";
          nameElement.textContent = this._propertyName;
          nameElement.normalize();
          return nameElement;
      },
  
      /**
       * @return {!Element}
       */
      renderValue: function()
      {
          var valueElement = createElement("span");
          valueElement.className = "value";
  
          if (!this._propertyValue)
              return valueElement;
  
          var formatter = new WebInspector.StringFormatter();
          formatter.addProcessor(WebInspector.StylesSidebarPropertyRenderer._urlRegex(this._propertyValue), this._processURL.bind(this));
          if (this._bezierHandler && WebInspector.CSSMetadata.isBezierAwareProperty(this._propertyName))
              formatter.addProcessor(WebInspector.StylesSidebarPropertyRenderer._bezierRegex, this._bezierHandler);
          if (this._colorHandler && WebInspector.CSSMetadata.isColorAwareProperty(this._propertyName))
              formatter.addProcessor(WebInspector.StylesSidebarPropertyRenderer._colorRegex, this._colorHandler);
  
          valueElement.appendChild(formatter.formatText(this._propertyValue));
          valueElement.normalize();
          return valueElement;
      },
  
      /**
       * @param {string} url
       * @return {!Node}
       */
      _processURL: function(url)
      {
          var hrefUrl = url;
          var match = hrefUrl.match(/['"]?([^'"]+)/);
          if (match)
              hrefUrl = match[1];
          var container = createDocumentFragment();
          container.createTextChild("url(");
          if (this._rule && this._rule.resourceURL())
              hrefUrl = WebInspector.ParsedURL.completeURL(this._rule.resourceURL(), hrefUrl);
          else if (this._node)
              hrefUrl = this._node.resolveURL(hrefUrl);
          var hasResource = hrefUrl && !!WebInspector.resourceForURL(hrefUrl);
          // FIXME: WebInspector.linkifyURLAsNode() should really use baseURI.
          container.appendChild(WebInspector.linkifyURLAsNode(hrefUrl || url, url, undefined, !hasResource));
          container.createTextChild(")");
          return container;
      }
  }
  
  /**
   * @constructor
   */
  WebInspector.StylesSidebarPane.MatchedRulesPayload = function()
  {
      /** @type {?WebInspector.CSSStyleDeclaration} */
      this.inlineStyle = null;
      /** @type {?WebInspector.CSSStyleDeclaration} */
      this.attributesStyle = null;
      /** @type {?Array.<!WebInspector.CSSRule>} */
      this.matchedCSSRules = null;
      /** @type {?Array.<{pseudoId: number, rules: !Array.<!WebInspector.CSSRule>}>} */
      this.pseudoElements = null;
      /** @type {?Array.<{matchedCSSRules: !Array.<!WebInspector.CSSRule>}>} */
      this.inherited = null;
  }
  
  WebInspector.StylesSidebarPane.MatchedRulesPayload.prototype = {
      /**
       * @return {boolean}
       */
      fulfilled: function()
      {
          return !!(this.matchedCSSRules && this.pseudoElements && this.inherited);
      }
  }
  