Current spec behavior is to clip elements to the viewport. We should respect that unless the spec changes.
<rdar://problem/39014307>
Created attachment 336808 [details] Patch
Comment on attachment 336808 [details] Patch Clearing flags on attachment: 336808 Committed r230088: <https://trac.webkit.org/changeset/230088>
All reviewed patches have been landed. Closing bug.