Don't clear 'web animations dirty' flag if we have no rare data

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

 /*
  * Copyright (C) 2008, 2009, 2011 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 706 matching lines @@
 
   if (getLayoutObject())
     return getLayoutObject()->style()->visibility() != EVisibility::kVisible;
 
   // This is an obscure corner case: if a node has no LayoutObject, that means
   // it's not rendered, but we still may be exploring it as part of a text
   // alternative calculation, for example if it was explicitly referenced by
   // aria-labelledby. So we need to explicitly call the style resolver to check
   // whether it's invisible or display:none, rather than relying on the style
   // cached in the LayoutObject.
-  Document* doc = getDocument();
-  if (doc && doc->frame() && getNode() && getNode()->isElementNode()) {
-    RefPtr<ComputedStyle> style =
-        doc->ensureStyleResolver().styleForElement(toElement(getNode()));
-    return style->display() == EDisplay::None ||
-           style->visibility() != EVisibility::kVisible;
+  Document* document = getDocument();
+  if (!document || !document->frame())
+    return false;
+  if (Node* node = getNode()) {
+    if (node->isConnected() && node->isElementNode()) {
+      RefPtr<ComputedStyle> style =
+          document->ensureStyleResolver().styleForElement(toElement(node));
+      return style->display() == EDisplay::None ||
+             style->visibility() != EVisibility::kVisible;
+    }
   }
-
   return false;
 }
 
 String AXObject::ariaTextAlternative(bool recursive,
                                      bool inAriaLabelledByTraversal,
                                      AXObjectSet& visited,
                                      AXNameFrom& nameFrom,
                                      AXRelatedObjectVector* relatedObjects,
                                      NameSources* nameSources,
                                      bool* foundTextAlternative) const {
@@ skipping 1014 matching lines @@
 }
 
 DEFINE_TRACE(AXObject) {
   visitor->trace(m_children);
   visitor->trace(m_parent);
   visitor->trace(m_cachedLiveRegionRoot);
   visitor->trace(m_axObjectCache);
 }
 
 }  // namespace blink