The clip that is set prior to beginning a transparency layer is not transform-aware.
Created attachment 16805 [details] Test Case
Created attachment 16806 [details] Patch that makes transforms work with opacity.
Comment on attachment 16806 [details] Patch that makes transforms work with opacity. This has a couple of minor issues. I'm going to polish it.
Created attachment 16807 [details] Fix that aggressively begins ancestor transparency layers when a transform is encountered
Comment on attachment 16807 [details] Fix that aggressively begins ancestor transparency layers when a transform is encountered r=me provided you remove the unused argument to beginTransparencyLayers() and add a change log
Landed in <http://trac.webkit.org/projects/webkit/changeset/26894>.