First parameter to HTMLMediaElement.canPlayType() should be mandatory: - https://html.spec.whatwg.org/multipage/embedded-content.html#htmlmediaelement Firefox and Chrome agree with the specification.
Created attachment 284744 [details] Patch
Comment on attachment 284744 [details] Patch Clearing flags on attachment: 284744 Committed r203806: <http://trac.webkit.org/changeset/203806>
All reviewed patches have been landed. Closing bug.