http://trac.webkit.org/changeset/150043 made headers and footers stay pinned to the left edge when scrolling horizontally, but the bug still occurs when you are scrolled horizontally and zoomed in. Patch forthcoming. <rdar://problem/14006745>
Created attachment 204540 [details] Patch
Comment on attachment 204540 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=204540&action=review > Source/WebCore/page/scrolling/mac/ScrollingTreeScrollingNodeMac.mm:321 > + float horizontalScrollOffsetForBanner = scrollOffsetForFixedChildren.width(); > + if (frameScaleFactor() != 1) > + horizontalScrollOffsetForBanner = FrameView::scrollOffsetForFixedPosition(viewportRect(), totalContentsSize(), position, scrollOrigin(), 1, false, headerHeight(), footerHeight()).width(); > + This could use a comment. It is confusing enough.
Comment added! Thank you! http://trac.webkit.org/changeset/151564