Implement closed shadow adjustment for Element.offsetParent

third_party/WebKit/Source/core/html/HTMLElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLElement.cpp b/third_party/WebKit/Source/core/html/HTMLElement.cpp
index 97f7595717213225f3016ec684e83d20fafde47f..7d232d27b792980f594d03353f394ffd3b571dda 100644
--- a/third_party/WebKit/Source/core/html/HTMLElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLElement.cpp
@@ -54,6 +54,7 @@
 #include "core/html/HTMLTemplateElement.h"
 #include "core/html/HTMLTextFormControlElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
+#include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutObject.h"
 #include "core/page/SpatialNavigation.h"
 #include "platform/Language.h"
@@ -1051,6 +1052,52 @@ const AtomicString& HTMLElement::eventParameterName()
     return eventString;
 }
 
+int HTMLElement::offsetLeftForBinding()
+{
+    document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
+    if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
+        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetLeft(unclosedOffsetParent())), layoutObject->styleRef()).round();
+    return 0;
+}
+
+int HTMLElement::offsetTopForBinding()
+{
+    document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
+    if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
+        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetTop(unclosedOffsetParent())), layoutObject->styleRef()).round();
+    return 0;
+}
+
+int HTMLElement::offsetWidthForBinding()
+{
+    document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
+    if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
+        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetWidth(unclosedOffsetParent())), layoutObject->styleRef()).round();
+    return 0;
+}
+
+int HTMLElement::offsetHeightForBinding()
+{
+    document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
+    if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
+        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetHeight(unclosedOffsetParent())), layoutObject->styleRef()).round();
+    return 0;
+}
+
+Element* HTMLElement::unclosedOffsetParent()
+{
+    document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
+
+    LayoutObject* layoutObject = this->layoutObject();
+    if (!layoutObject)
+        return nullptr;
+
+    Element* element = layoutObject->offsetParent();
+    while (element && (!element->isUnclosedNodeOf(*this) || (element->isInShadowTree() && element->containingShadowRoot()->type() == ShadowRootType::UserAgent)))
+        element = element->layoutObject()->offsetParent();
+    return element;
+}
+
 } // namespace blink
 
 #ifndef NDEBUG