This shows up in the pixel results for fast/inline/continuation-outlines-with-layers.html
See http://trac.webkit.org/browser/trunk/LayoutTests/platform/chromium-linux/fast/inline/continuation-outlines-with-layers-expected.png?rev=84406 and http://trac.webkit.org/browser/trunk/LayoutTests/platform/chromium-win/fast/inline/continuation-outlines-with-layers-expected.png?rev=84406 Notice the way 'Content Before' is surrounded by an outline and compare to: http://trac.webkit.org/browser/trunk/LayoutTests/platform/mac/fast/inline/continuation-outlines-with-layers-expected.png?rev=84406