Implement closed shadow adjustment for Element.offsetParent

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 622 matching lines @@
     if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
         return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetHeight()), layoutObject->styleRef()).round();
     return 0;
 }
 
 Element* Element::offsetParent()
 {
     document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
 
     LayoutObject* layoutObject = this->layoutObject();
-    if (!layoutObject)
-        return nullptr;
-
-    Element* element = layoutObject->offsetParent();
-    if (!element)
-        return nullptr;
-
-    if (element->isInShadowTree() && !element->containingShadowRoot()->isOpenOrV0())
-        return nullptr;
-
-    return element;
+    return layoutObject ? layoutObject->unclosedOffsetParent() : nullptr;
 }
 
 int Element::clientLeft()
 {
     document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
 
     if (LayoutBox* layoutObject = layoutBox())
         return adjustLayoutUnitForAbsoluteZoom(layoutObject->clientLeft(), layoutObject->styleRef()).round();
     return 0;
 }
@@ skipping 3053 matching lines @@
 
 DEFINE_TRACE_WRAPPERS(Element)
 {
     if (hasRareData()) {
         visitor->traceWrappers(elementRareData());
     }
     ContainerNode::traceWrappers(visitor);
 }
 
 } // namespace blink