[Bug 28783] New: WebVTT: Rendering section doesn't work for descriptions and chapters

https://www.w3.org/Bugs/Public/show_bug.cgi?id=28783

            Bug ID: 28783
           Summary: WebVTT: Rendering section doesn't work for
                    descriptions and chapters
           Product: TextTracks CG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: WebVTT
          Assignee: dave.null@w3.org
          Reporter: silviapfeiffer1@gmail.com
        QA Contact: public-texttracks@w3.org
                CC: philipj@opera.com, silviapfeiffer1@gmail.com

When you look at the HTML spec
(https://html.spec.whatwg.org/multipage/embedded-content.html#rules-for-updating-the-text-track-rendering),
it talks about updating the display for cues that are "showing". And there, it
talks about visual rendering for subtitles and captions and for chapters (as a
navigation mechanism), and non-visual exposure for descriptions. 

Rendering of chapters doesn't really work in the way that the "Rendering"
section describes - 6.1 should be restricted to captions and subtitles only.
Then there needs to be something to describe how this works for chapters and
for descriptions.

I'm thinking that this doesn't have to be complicated.

For chapters we already have special parsing to extract the chapter titles. We
can say that the rendering of these chapter titles is expected part of the
rendering of the media element controls for navigation purposes and then leave
the details to the browsers.

For descriptions we could say that rendering is expected to be done by the
browser via speech synthesis, once such a feature is available in browsers, and
via exposure to screen readers in the meantime.

I'm after feedback for these ideas.

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Received on Tuesday, 9 June 2015 19:11:55 UTC