Create a software filter like "blur" or "opacity" and wrap that in a composited layer. Make sure that they are the same size.
The compositor will consider the layers to be opaque and thus render without opacity.
Created attachment 197314 [details]
Comment on attachment 197314 [details]
Attachment 197314 [details] did not pass efl-ews (efl):
Created attachment 197348 [details]
Added missing ifdef.
Comment on attachment 197348 [details]
Clearing flags on attachment: 197348
Committed r148117: <http://trac.webkit.org/changeset/148117>
All reviewed patches have been landed. Closing bug.
Could this have broken this test?