In this case http://jsfiddle.net/25bwx5sw/6/ border-radius and overflow:hidden renders incorrect.
The example speaks for itself.
Issue is found in Safari 7.1/8.0 on OS X and Safari 8.0 on iOS.
Regressed in http://trac.webkit.org/changeset/170532
Created attachment 239814 [details]
Created attachment 239826 [details]
Comment on attachment 239826 [details]
Clearing flags on attachment: 239826
Committed r174716: <http://trac.webkit.org/changeset/174716>
All reviewed patches have been landed. Closing bug.