We fail the Opera-submitted test at http://w3c-test.org/html/tests/submission/Opera/media/interfaces/TextTrackCue/line.html. We fail the first test because inserting a new TextTrack with a cue does not set the cue's .line property to that of the previous cue - 1.
<rdar://problem/12758050>
We are passing all tests: https://wpt.fyi/results/webvtt/api/VTTCue/line.html?label=experimental&label=master&aligned= http://wpt.live/webvtt/api/VTTCue/line.html ___ Marking this as 'RESOLVED CONFIGURATION CHANGED'.