ISSUE-233: Superscript and subscript character style

Superscript and subscript

Superscript and subscript character style

State:
CLOSED
Product:
TTML2
Raised by:
Pierre-Anthony Lemieux
Opened on:
2013-05-30
Description:
[The following is extracted from the liaison received from SMPTE at https://lists.w3.org/Archives/Member/w3c-archive/2012Sep/0214.html]

See Section 6.4.2 at ST 428-7.

It shall be possible to apply a superscript/subscript style parameter to a <span> element, for the purpose of introducing an offset from the baseline of horizontal text. The parameter value shall be one of "sub", "super" or "normal".

For a value of "normal", no modifications to the rendered text shall be made.
For a value of "sub" and "super", the baseline of the <span> element shall be offset vertically by – 0.5 em and 0.5 em, respectively. In both cases, the font size shall be 0.6 em.

The parameter is not applicable when vertical progression is used.
Related Actions Items:
No related actions
Related emails:
  1. Re: [ttml2] Action-369 Action-382 - draft dispositions flattened thread incorporating changes (from nigel.megitt@bbc.co.uk on 2015-03-19)
  2. Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-03-18)
  3. Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from glenn@skynav.com on 2015-03-05)
  4. Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-03-05)
  5. Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from glenn@skynav.com on 2015-03-04)
  6. Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-03-04)
  7. Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-02-25)
  8. [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-02-06)
  9. {minutes} TTML Meeting of 24/10/13 (from glenn@skynav.com on 2013-10-24)
  10. RE: TTML Agenda for 24/10/13 (from mdolan@newtbt.com on 2013-10-23)
  11. TTML Agenda for 24/10/13 (from nigel.megitt@bbc.co.uk on 2013-10-23)
  12. ISSUE-233 (Superscript and subscript): Superscript and subscript character style [TTML.next] (from sysbot+tracker@w3.org on 2013-05-30)

Related notes:

This seems a request to support the CSS3 Font Module's font-variant-position property [1] or something like that, though mandating specific offsets is questionable (though might be used in case the font itself doesn't specify the nominal offset).

[1] http://www.w3.org/TR/css3-fonts/#propdef-font-variant-position

Glenn Adams, 30 May 2013, 20:35:04

May be duplication of Issue 24.

Glenn Adams, 25 Aug 2013, 17:12:17

See ISSUE-24

Pierre-Anthony Lemieux, 21 Oct 2013, 20:27:03

Duplicate of issue-24

Philippe Le Hégaret, 24 Oct 2013, 15:07:30

Addressed in https://dvcs.w3.org/hg/ttml/rev/32a8268a5577

Glenn Adams, 24 Sep 2014, 21:14:06

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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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