Implement closed shadow adjustment for Element.offsetParent

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

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index ebaa903a39c876845428c9f71fc889bc35ced02e..87b382affe98ab14745f1b1f9efa12af937baefd 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -640,17 +640,7 @@ 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()