[Bug 20146] New: [WebVTT] Cue text rendering step adjustment

https://www.w3.org/Bugs/Public/show_bug.cgi?id=20146

            Bug ID: 20146
           Summary: [WebVTT] Cue text rendering step adjustment
    Classification: Unclassified
           Product: TextTracks CG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: WebVTT
          Assignee: ian@hixie.ch
          Reporter: silviapfeiffer1@gmail.com
        QA Contact: dave.null@w3.org
                CC: mike@w3.org, public-texttracks@w3.org

In Section 3.5 WebVTT cue text rendering rules, rendering step 10 we calculate
all the styles for the cues.

Step 7 sets the 'width' from 'size':
If the text track cue writing direction is horizontal, then let width be 'size
vw' and height be 'auto'. Otherwise, let width be 'auto' and height be 'size
vh'. (These are CSS values used by the next section to set CSS properties for
the rendering; 'vw' and 'vh' are CSS units.) [CSSVALUES]

Step 10 changes 'size' again in substep 2 and 4 to remove edge margin:
2. If x-position is less than edge margin and the sum of x-position and size is
more than edge margin, then increase x-position by edge margin and decrease
size by the same amount.

4. If x-position is less than right margin edge, and the sum of x-position and
size is more than right margin edge, then decrease size by edge margin.

However, the 'width' calculation from Step 7 is not repeated. Thus, the cues
potentially end up being too wide (e.g. 100% width, but offset by an edge
margin).

==

I think Step 7 should be moved after Step 10.

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Received on Thursday, 29 November 2012 03:08:56 UTC