User stylesheets may be affected.
<rdar://problem/38565834>
Created attachment 344253 [details] patch
Should be testable?
Created attachment 344301 [details] with test
Created attachment 344303 [details] with a test
Comment on attachment 344303 [details] with a test Clearing flags on attachment: 344303 Committed r233510: <https://trac.webkit.org/changeset/233510>
All reviewed patches have been landed. Closing bug.