Steps to reproduce: 1) Make sure the back/forward cache is enabled. 2) Go to the URL. 3) Go to about:blank. 4) Go back. Result: ASSERTION FAILED: obj->isInlineFlow() || obj == this (WebCore/rendering/bidi.cpp:466 WebCore::InlineFlowBox* WebCore::RenderBlock::createLineBoxes(WebCore::RenderObject*))