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Video Overlay

From WHATWG Wiki
Revision as of 11:24, 28 November 2009 by Philipj (talk | contribs) (→‎References)
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<overlay> is a proposal to display and style subtitles/captions for <video> in a uniform way, regardless of whether they are in-band or from an external resource. It also doubles as a container to overlay arbitrary (HTML) content on a <video>, enabling advanced scripted overlays such as karaoke animations or visual annotations.


Use Case Description

Complete description of the use case.

Current Limitations

HTML5 currently lacks convenient markup and interfaces to handle at least three things:

  • Syncing and displaying external subtitles/captions with <video>
  • Styling in-band subtitles/captions from media resources
  • Placing

Current Usage and Workarounds

Some evidence that this feature is desperately needed on the web. You may provide a separate examples page for listing these.


Explanation of how and why new markup would be useful.

Requests for this Feature

  • Source

    I would like this feature ...

Proposed Solutions

My Solution

Brief description of the solution and of how it address the problem at hand.

Processing Model

Explanation of the changes introduced by this solution. It explains how the document is processed, and how errors are handled. This should be very clear, including things such as event timing if the solution involves events, how to create graphs representing the data in the case of semantic proposals, etc.


Cases not covered by this solution in relation to the problem description; other problems with this solution, if any.


Description of how and why browser vendors would take advantage of this feature.


Reasons why page authors would use this solution.


Silvia Pfeiffer's blog posts:

Silvia Pfeiffer's <itext> proposals:

Mailing lists: