[Bug 28105] New: Should the rendering area be the video element or the video box within?

https://www.w3.org/Bugs/Public/show_bug.cgi?id=28105

            Bug ID: 28105
           Summary: Should the rendering area be the video element or the
                    video box within?
           Product: TextTracks CG
           Version: unspecified
          Hardware: PC
               URL: http://dev.w3.org/html5/webvtt/
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: WebVTT
          Assignee: dave.null@w3.org
          Reporter: philipj@opera.com
        QA Contact: public-texttracks@w3.org
                CC: philipj@opera.com, silviapfeiffer1@gmail.com

http://dev.w3.org/html5/webvtt/#processing-model says:

"Let video be the media element or other playback mechanism."

"The viewport (and initial containing block) is video's rendering area."

This isn't explicit about what the rendering area is when the <video> element
is not the same size as the video rendered within. This can happen with
object-fit, both with the default contain but also any value other than fill.

Points to consider:

* Percentage positions in WebVTT ought to be relative to the video. Otherwise
cues may end up obscuring what they were indented to avoid.

* Using the video rendering area is a bit more complicated implementation-wise.

* Using the video rendering area would make it impossible to deliberately use a
video which is taller than needed, so that the captions can be rendered beneath
the video.

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Received on Thursday, 26 February 2015 07:47:24 UTC