The current implementation of StyleSheet.parentStyleSheet assumes that the parentStyleSheet is the direct parent of the StyleSheet. This is never the case, as StyleSheet is always parented by a CSSRule.
Created attachment 112575 [details] Ein Patch
Comment on attachment 112575 [details] Ein Patch r=me
Comment on attachment 112575 [details] Ein Patch Clearing flags on attachment: 112575 Committed r98568: <http://trac.webkit.org/changeset/98568>
All reviewed patches have been landed. Closing bug.