Per Secure Contexts and HTML, this should be true/false.
Created attachment 347817 [details] Patch
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/12628
Comment on attachment 347817 [details] Patch Clearing flags on attachment: 347817 Committed r235234: <https://trac.webkit.org/changeset/235234>
All reviewed patches have been landed. Closing bug.
<rdar://problem/43654136>