Second parameter to Range.setStart() / setEnd() should be mandatory: - https://dom.spec.whatwg.org/#interface-range Firefox and Chrome agree with the specification.
Created attachment 284562 [details] Patch
Comment on attachment 284562 [details] Patch Clearing flags on attachment: 284562 Committed r203713: <http://trac.webkit.org/changeset/203713>
All reviewed patches have been landed. Closing bug.