[Bug 20723] New: Error in definition of "WebVTT file using only nested cues"

https://www.w3.org/Bugs/Public/show_bug.cgi?id=20723

            Bug ID: 20723
           Summary: Error in definition of "WebVTT file using only nested
                    cues"
    Classification: Unclassified
           Product: TextTracks CG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: WebVTT
          Assignee: ian@hixie.ch
          Reporter: lawrence.forooghian@saffrondigital.com
        QA Contact: dave.null@w3.org
                CC: mike@w3.org, public-texttracks@w3.org

The January 3rd, 2013 version of the spec says:

A WebVTT file <http://dev.w3.org/html5/webvtt/#webvtt-file> whose cues all
have an end time offset x greater than or equal to the end time offsets of
all the cues whose start time offsets are less than x is said to be a
WebVTT file using only nested cues.

An example of such a file is then given, starting as follows:

WEBVTT

00:00.000 --> 01:24.000
Introduction

00:00.000 --> 00:44.000
Topics


If you look at the second cue (x = 00:44.000), then the first cue is a cue
whose start time is less than x (it's 00:00.000), however x is not greater
than or equal to the end time offset of the first cue (which is 01:24.000).

I think that a correct definition would be:

A WebVTT file which, given any two cues with start and end time offsets (x1,
y1) and (x2, y2) respectively, has either (x1 <= x2 and y1 >= y2) or (x1 >= x2
and y1 <= y2), is said to be a WebVTT file using only nested cues.

(I'm not suggesting that this be the exact wording.)

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Received on Monday, 21 January 2013 09:24:05 UTC