Check whether aria-expanded attribute is defined

Source/core/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 691 matching lines @@
     if (equalIgnoringCase(getAttribute(aria_disabledAttr), "true"))
         return false;
 
     Node* node = this->node();
     if (!node || !node->isElementNode())
         return true;
 
     return !toElement(node)->isDisabledFormControl();
 }
 
-bool AXNodeObject::isExpanded() const
+AccessibilityExpanded AXNodeObject::isExpanded() const
 {
-    if (equalIgnoringCase(getAttribute(aria_expandedAttr), "true"))
-        return true;
+    const AtomicString& expanded = getAttribute(aria_expandedAttr);
+    if (equalIgnoringCase(expanded, "true"))
+        return ExpandedExpanded;
+    if (equalIgnoringCase(expanded, "false"))
+        return ExpandedCollapsed;
 
-    return false;
+    return ExpandedUndefined;
 }
 
 bool AXNodeObject::isIndeterminate() const
 {
     Node* node = this->node();
     if (!isHTMLInputElement(node))
         return false;
 
     return toHTMLInputElement(node)->shouldAppearIndeterminate();
 }
@@ skipping 366 matching lines @@
 }
 
 String AXNodeObject::ariaDescribedByAttribute() const
 {
     WillBeHeapVector<RawPtrWillBeMember<Element> > elements;
     elementsFromAttribute(elements, aria_describedbyAttr);
 
     return accessibilityDescriptionForElements(elements);
 }
 
-
 String AXNodeObject::ariaLabeledByAttribute() const
 {
     WillBeHeapVector<RawPtrWillBeMember<Element> > elements;
     ariaLabeledByElements(elements);
 
     return accessibilityDescriptionForElements(elements);
 }
 
 AccessibilityRole AXNodeObject::ariaRoleAttribute() const
 {
@@ skipping 645 matching lines @@
     float range = maxValueForRange() - minValueForRange();
     float value = valueForRange();
 
     value += range * (percentChange / 100);
     setValue(String::number(value));
 
     axObjectCache()->postNotification(node(), AXObjectCacheImpl::AXValueChanged, true);
 }
 
 } // namespace blink