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The following WebIDL code: [[ interface TextTrackCue : EventTarget { attribute DOMString id; attribute double startTime; attribute double endTime; attribute boolean pauseOnExit; attribute EventHandler onenter; attribute EventHandler onexit; }; ]] http://www.w3.org/html/wg/drafts/html/CR/embedded-content-0.html#texttrackcue is missing the track attribute: [[ readonly attribute TextTrack? track; ]] http://www.w3.org/html/wg/drafts/html/master/embedded-content.html#texttrackcue The rest of the section talks about the track attribute thus my assumption that the attribute is simply missing in the interface.
The only instances of "track attribute" I can find in the spec are related to TrackEvent, which does have a track attribute.
There should be one in TextTrackCue as well. Here is its description you should look for: [[ The track attribute, on getting, must return the TextTrack object of the text track in whose list of cues the text track cue that the TextTrackCue object represents finds itself, if any; or null otherwise. ]] http://www.w3.org/html/wg/drafts/html/CR/embedded-content-0.html#texttrackcue Btw, the related test is at https://github.com/w3c/web-platform-tests/blob/master/html/semantics/embedded-content/media-elements/interfaces/TextTrackCue/track.html
Must be a merge error on the HTML5.0 spec, since we have it on the HTML5.1 spec: http://www.w3.org/html/wg/drafts/html/master/embedded-content.html#texttrackcue
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the Editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the Tracker Issue; or you may create a Tracker Issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: https://github.com/w3c/html/commit/3ed2f459ba285575c683e2b1be62c7337a959b93 Rationale: Fixed merge error