availableLogicalWidth() needs to be implemented, since percentage padding depends on it.
Created attachment 68147 [details] Patch
Comment on attachment 68147 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=68147&action=review > WebCore/rendering/RenderBox.cpp:1739 > + if (style()->blockFlow() == TopToBottomBlockFlow || style()->blockFlow() == BottomToTopBlockFlow) I think you should start considering RenderStyle::blockFlowAxis() or RenderStyle::isVerticalBlockFlow() or something.
Yeah I'll add isVerticalTextFlow() in another patch and fix this. Fixed in r67886.