ISSUE-439: #length-pixel forbidden

#length-pixel forbidden

State:
OPEN
Product:
TTML WebVTT mapping note
Raised by:
Pierre-Anthony Lemieux
Opened on:
2015-09-23
Description:
Although specifying lengths in pixels should generally be discouraged, I have seen many TTML documents use them.

As long as tts:extent is specified on <tt> using "px" metric, can't "px" coordinates be converted to percentage coordinates by merely dividing the horizontal (vertical) component by the number of tts:extent pixels in the horizontal (vertical) direction?
Related Actions Items:
No related actions
Related emails:
  1. {agenda} TTWG Meeting 2015-09-24 (from nigel.megitt@bbc.co.uk on 2015-09-23)
  2. ISSUE-439: #length-pixel forbidden [TTML WebVTT mapping note] (from sysbot+tracker@w3.org on 2015-09-23)

Related notes:

This is related to the general mapping approach taken in the document to make an "intermediate" document type as close as possible to WebVTT. WebVTT does not support "absolute" positioning with pixel. But you may allow pixel as length metric for font-size (this is supported in CSS).

Andreas Tai, 27 Oct 2015, 21:53:01

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David Singer <singer@apple.com>, Nigel Megitt <nigel.megitt@bbc.co.uk>, Chairs, Thierry Michel <tmichel@w3.org>, Philippe Le Hégaret <plh@w3.org>, Atsushi Shimono <atsushi@w3.org>, Staff Contacts
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