Implement the inert attribute

third_party/WebKit/Source/devtools/front_end/accessibility/AccessibilityNodeView.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.AccessibilitySubPane}
  */
 WebInspector.AXNodeSubPane = function()
 {
@@ skipping 632 matching lines @@
         break;
     case "emptyAlt":
         reasonElement = WebInspector.formatLocalized("Element has empty alt text.", []);
         break;
     case "emptyText":
         reasonElement = WebInspector.formatLocalized("No text content.", []);
         break;
     case "inert":
         reasonElement = WebInspector.formatLocalized("Element is inert.", []);
         break;
+    case "inertRoot":
+        reasonElement = WebInspector.formatLocalized("Element is in an inert subtree from:\u00a0", []);
+        break;
     case "inheritsPresentation":
         reasonElement = WebInspector.formatLocalized("Element inherits presentational role from\u00a0", []);
         break;
     case "labelContainer":
         reasonElement = WebInspector.formatLocalized("Part of label element:\u00a0", []);
         break;
     case "labelFor":
         reasonElement = WebInspector.formatLocalized("Label for\u00a0", []);
         break;
     case "notRendered":
@@ skipping 13 matching lines @@
         reasonElement = WebInspector.formatLocalized("Static text node is used as name for\u00a0", []);
         break;
     case "uninteresting":
         reasonElement = WebInspector.formatLocalized("Element not interesting for accessibility.", []);
         break;
     }
     if (reasonElement)
         reasonElement.classList.add("ax-reason");
     return reasonElement;
 };