jwplayer/jwplayer — pull request #105 by foolip (2014-07-16 09:44:01+00:00)
Title: Don't look for webkitEnterFullscreen/webkitEnterFullScreen on <div>

These two functions have never been exposed on HTMLDivElement, only
on HTMLMediaElement/HTMLVideoElement:
http://trac.webkit.org/changeset/50893
http://trac.webkit.org/changeset/54143

Looking for it on the _playerElement

is useless, but harmless.