Show reasons why nodes are ignored in accessibility sidebar

Source/modules/accessibility/AXNodeObject.cpp

 /*
 * Copyright (C) 2012, Google Inc. All rights reserved.
 *
 * 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
@@ skipping 149 matching lines @@
 
 bool AXNodeObject::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReasons) const
 {
 #if ENABLE(ASSERT)
     // Double-check that an AXObject is never accessed before
     // it's been initialized.
     ASSERT(m_initialized);
 #endif
 
     // If this element is within a parent that cannot have children, it should not be exposed.
-    if (isDescendantOfLeafNode())
+    if (isDescendantOfLeafNode()) {
+        if (ignoredReasons)
+            ignoredReasons->append(IgnoredReason(AXAncestorIsLeafNode, leafNodeAncestor()));
         return true;
+    }
 
     // Ignore labels that are already referenced by a control's title UI element.
     AXObject* controlObject = correspondingControlForLabelElement();
-    if (controlObject && !controlObject->deprecatedExposesTitleUIElement() && controlObject->isCheckboxOrRadio())
+    if (controlObject && !controlObject->deprecatedExposesTitleUIElement() && controlObject->isCheckboxOrRadio()) {
+        if (ignoredReasons) {
+            HTMLLabelElement* label = labelElementContainer();
+            if (label && !label->isSameNode(node())) {
+                AXObject* labelAXObject = axObjectCache()->getOrCreate(label);
+                ignoredReasons->append(IgnoredReason(AXLabelContainer, labelAXObject));
+            }
+
+            ignoredReasons->append(IgnoredReason(AXLabelFor, controlObject));
+        }
         return true;
+    }
 
-    return m_role == UnknownRole;
+    if (m_role == UnknownRole) {
+        if (ignoredReasons)
+            ignoredReasons->append(IgnoredReason(AXUninteresting));
+        return true;
+    }
+    return false;
 }
 
 static bool isListElement(Node* node)
 {
     return isHTMLUListElement(*node) || isHTMLOListElement(*node) || isHTMLDListElement(*node);
 }
 
 static bool isPresentationalInTable(AXObject* parent, HTMLElement* currentElement)
 {
     if (!currentElement)
@@ skipping 2029 matching lines @@
         ariaLabeledByElements(elements);
 
         for (const auto& element : elements) {
             RefPtr<AXObject> axElement = axObjectCache()->getOrCreate(element);
             textOrder.append(AccessibilityText(ariaLabeledBy, AlternativeText, axElement));
         }
     }
 }
 
 } // namespace blink