Created attachment 70560 [details] HTML page that recreates the issue Given one or more inline elements with padding or margin ("spans") flowing inside a fixed container, adding an absolutely positioned child to the span causes the spans to overflow beyond the bounds of the container. Removing the absolutely positioned child (or setting 'display: none') results in normal flow. It appears as if the presence of the absolutely positioned child causes the margin/padding dimensions to not be summed, as the overflow is proportional to the cumulative margin and padding. The attached file renders correctly (or as expected) in Mozilla.
Created attachment 197983 [details] Patch
Comment on attachment 197983 [details] Patch r=me
Comment on attachment 197983 [details] Patch Clearing flags on attachment: 197983 Committed r148453: <http://trac.webkit.org/changeset/148453>
All reviewed patches have been landed. Closing bug.