1 Test TextTrack constants.
3 EXPECTED (HTMLTrackElement.NONE == '0') OK
4 EXPECTED (HTMLTrackElement.LOADING == '1') OK
5 EXPECTED (HTMLTrackElement.LOADED == '2') OK
6 EXPECTED (HTMLTrackElement.ERROR == '3') OK
8 EXPECTED (TextTrack.DISABLED == '0') OK
9 EXPECTED (TextTrack.HIDDEN == '1') OK
10 EXPECTED (TextTrack.SHOWING == '2') OK