set and get scrollTop/Left through documentElement and body should be symmetric, according to the d…

Source/core/html/HTMLBodyElement.cpp

Index: Source/core/html/HTMLBodyElement.cpp
diff --git a/Source/core/html/HTMLBodyElement.cpp b/Source/core/html/HTMLBodyElement.cpp
index eed6b0ccc044ff4651261af1214e5e0907678360..23d1423fef1a73f7031cb4cf8993ed8a7b8071be 100644
--- a/Source/core/html/HTMLBodyElement.cpp
+++ b/Source/core/html/HTMLBodyElement.cpp
@@ -268,6 +268,9 @@ int HTMLBodyElement::scrollLeft()
 
 void HTMLBodyElement::setScrollLeft(int scrollLeft)
 {
+    if (!document().inQuirksMode())
+        return;
+
     Document& document = this->document();
     document.updateLayoutIgnorePendingStylesheets();
     Frame* frame = document.frame();
@@ -296,6 +299,9 @@ int HTMLBodyElement::scrollTop()
 
 void HTMLBodyElement::setScrollTop(int scrollTop)
 {
+    if (!document().inQuirksMode())
+        return;
+
     Document& document = this->document();
     document.updateLayoutIgnorePendingStylesheets();
     Frame* frame = document.frame();