http://trac.webkit.org/browser/trunk/Source/WebCore/rendering/RenderFullScreen.cpp?rev=HEAD#L154 The code here looks like: 154 while ((child = firstChild())) { 155 child->remove(); 156 parent()->addChild(child, this); 157 parent()->setNeedsLayoutAndPrefWidthsRecalc(); 158 } It seems to me like setNeedsLayoutAndPrefWidthsRecalc() should be called on the child (which then would recurse through the parents). hyatt, does that seem plausible? At least, if it is right to call it on the parent, it should be outside the loop. (I don't have a testcase either way, we found this by code inspection)