ISSUE-256: Unsupported value behavior for tts:fontSize

unsupported tts:fontSize

Unsupported value behavior for tts:fontSize

State:
CLOSED
Product:
TTML 1.0
Raised by:
Pierre-Anthony Lemieux
Opened on:
2013-06-19
Description:
Section 8.2.9 states:

"If a specified value of this attribute is not supported, then a presentation processor must interpret the attribute as if the value 1c were specified."

Let's say that 1c is equivalent to 24px, the device supports 12px and 24px fonts (as bitmaps without scaling support) and I specify tts:fontSize='12.1px'. Well 12.1px is not supported, so I would get a 24px font instead of 12px. This doesn't seem like a good idea.

I suggest changing this language to match what is used for "closest supported opacity" (8.3.1), namely, the following:

"If a presentation processor does not support a specific, valid font size value, then it must interpret it as being equal to the closest supported value."
Related Actions Items:
No related actions
Related emails:
  1. Minutes - 2013-06-27 (from glenn@skynav.com on 2013-07-11)
  2. RE: TTML Agenda for 26/06/13 (from mdolan@newtbt.com on 2013-06-27)
  3. TTML Agenda for 26/06/13 (from Sean.Hayes@microsoft.com on 2013-06-27)
  4. Re: TTML 1.0 Issues - Newly Moved to Pending Review (from glenn@skynav.com on 2013-06-20)
  5. Re: TTML 1.0 Issues - Newly Moved to Pending Review (from glenn@skynav.com on 2013-06-20)
  6. ISSUE-256 (unsupported tts:fontSize): Unsupported value behavior for tts:fontSize [TTML 1.0] (from sysbot+tracker@w3.org on 2013-06-19)

Related notes:

Fixed. https://dvcs.w3.org/hg/ttml/rev/70165fde28e1 (8.2.9)

Glenn Adams, 20 Jun 2013, 04:48:03

PAL: P2

Philippe Le Hégaret, 24 Oct 2013, 15:59:00

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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>, Staff Contacts
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