[Bug 16706] New: <track>/WebVTT rendering of overlapping caption cues

https://www.w3.org/Bugs/Public/show_bug.cgi?id=16706

           Summary: <track>/WebVTT rendering of overlapping caption cues
           Product: TextTracks CG
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: WebVTT
        AssignedTo: ian@hixie.ch
        ReportedBy: silviapfeiffer1@gmail.com
         QAContact: dave.null@w3.org
                CC: mike@w3.org, public-texttracks@w3.org


The WebVTT layout algorithm tries very hard to not move cues around once
they've been displayed and to never obscure other cues. This means that for
cues that overlap in time, the rendering will be in a place where there is
space, sometimes with the earliest cue at the bottom. This is quite contrary to
common reading order (top-to-bottom) and conflicts with the (mainly US?) style
of scrolling captions up to make space for new caption text.

Users have expressed preferences for both rendering approaches: for rolling
previous captions out of the way and for adding new ones above existing ones.

Authors also want to have a means of controlling the display of
time-overlapping cues.

An analysis of the use cases for "rollup captions" can be found here, including
several different suggestions for how explicit support for this rendering style
could be added to the spec:
http://www.w3.org/community/texttracks/wiki/RollupCaptions .

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Received on Thursday, 12 April 2012 04:02:52 UTC