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As a conclusion of bug 20890, an audio with subtitles displayed becomes audio-visual and so video, so, it should not be permited to have an attribute kind set to subtitle in a track whose parent is an audio element.
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-v2.html Status: Rejected Change Description: none Rationale: This is a misunderstanding - there is nothing inherently visual about the <track> element. Subtitles in a <track> element in an <audio> element will provide the cues (e.g. the individual subtitles) through the JavaScript API. It allows the Web developer to do something with the cues in sync with the video, e.g. display them in a div next to the video or some other screen location. Something like was put together in SVG here: http://svg-wow.org/blog/2009/10/04/animated-lyrics/ .
The exemple you linked doesn't use any track element. Anyway, the concept of animated lyrics can effectively seen as something different then audio-video. So, I close the bug.
(In reply to comment #2) > The exemple you linked doesn't use any track element. Yes, I didn't use it as an HTML example, but only to demonstrate the idea. Sorry for the confusion.