Ignores ARIA relations (e.g. aria-labelledby) that point to an invisible target.

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp

 /*
 * Copyright (C) 2008 Apple 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 1251 matching lines @@
 
     return AXNodeObject::textAlternative(recursive, inAriaLabelledByTraversal, visited, nameFrom, relatedObjects, nameSources);
 }
 
 //
 // ARIA attributes.
 //
 
 void AXLayoutObject::ariaFlowToElements(AXObjectVector& flowTo) const
 {
-    accessibilityChildrenFromAttribute(aria_flowtoAttr, flowTo);
+    accessibilityChildrenFromAttribute(aria_flowtoAttr, flowTo, false /* includeHiddenObjects */);
 }
 
 void AXLayoutObject::ariaControlsElements(AXObjectVector& controls) const
 {
-    accessibilityChildrenFromAttribute(aria_controlsAttr, controls);
+    accessibilityChildrenFromAttribute(aria_controlsAttr, controls, false /* includeHiddenObjects */);
 }
 
 void AXLayoutObject::ariaOwnsElements(AXObjectVector& owns) const
 {
-    accessibilityChildrenFromAttribute(aria_ownsAttr, owns);
+    accessibilityChildrenFromAttribute(aria_ownsAttr, owns, false /* includeHiddenObjects */);
 }
 
 void AXLayoutObject::ariaDescribedbyElements(AXObjectVector& describedby) const
 {
-    accessibilityChildrenFromAttribute(aria_describedbyAttr, describedby);
+    accessibilityChildrenFromAttribute(aria_describedbyAttr, describedby, true /* includeHiddenObjects */);
 }
 
 void AXLayoutObject::ariaLabelledbyElements(AXObjectVector& labelledby) const
 {
-    accessibilityChildrenFromAttribute(aria_labelledbyAttr, labelledby);
+    accessibilityChildrenFromAttribute(aria_labelledbyAttr, labelledby, true /* includeHiddenObjects */);
 }
 
 bool AXLayoutObject::ariaHasPopup() const
 {
     return elementAttributeValue(aria_haspopupAttr);
 }
 
 bool AXLayoutObject::ariaRoleHasPresentationalChildren() const
 {
     switch (m_ariaRole) {
@@ skipping 1268 matching lines @@
                     result.unite(labelRect);
                 }
             }
         }
     }
 
     return result;
 }
 
 } // namespace blink