User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36 Steps to reproduce: I loaded a HTML doc with a <track> inside a <video>. I removed the video element from the DOM, then added it back. Test case: http://jsfiddle.net/4efxr61w/5/ Actual results: The video.textTracks.length === 0 after the video is removed from the DOM. Expected results: The video.textTracks should contain the child <track> element.

After a little digging, this may also be related these: Bug 1206304 - Created text tracks don't appear in the textTracks list https://bugzilla.mozilla.org/show_bug.cgi?id=1206304 Bug 1097279 - HTML5 video tracks without src aren't counted. Lose count after wrap. https://bugzilla.mozilla.org/show_bug.cgi?id=1097279

See https://dxr.mozilla.org/mozilla-central/source/dom/html/HTMLTrackElement.cpp#277

I'm experiencing the same thing. For video.js, I tried to enable native text track support but I'm unable to do so because video.js wraps the video element in a div so all tracks that are available when video.js initializes are lost due to this bug. Here's my test case: http://plnkr.co/edit/xmG766?p=preview

Review commit: https://reviewboard.mozilla.org/r/48943/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/48943/

Review commit: https://reviewboard.mozilla.org/r/48945/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/48945/

Comment on attachment 8745234 [details] MozReview Request: Bug 1242594 - Don't remove the textTrack if it's parent is not null. r=rillian https://reviewboard.mozilla.org/r/48943/#review46347

Comment on attachment 8745235 [details] MozReview Request: Bug 1242594 - Add testcase. r=rillian https://reviewboard.mozilla.org/r/48945/#review46349

https://hg.mozilla.org/integration/mozilla-inbound/rev/bbbac91d2aff https://hg.mozilla.org/integration/mozilla-inbound/rev/3e66690c2448

https://hg.mozilla.org/mozilla-central/rev/bbbac91d2aff https://hg.mozilla.org/mozilla-central/rev/3e66690c2448