As per https://html.spec.whatwg.org/multipage/semantics.html#the-link-element, link element should load resources using fetch. Fetch should consider data URLs resources as same origin.
<rdar://problem/30275036>
Created attachment 300993 [details] Patch
Comment on attachment 300993 [details] Patch Clearing flags on attachment: 300993 Committed r211926: <http://trac.webkit.org/changeset/211926>
All reviewed patches have been landed. Closing bug.