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:
- Re: [ttml2] Action-369 Action-382 - draft dispositions flattened thread incorporating changes (from nigel.megitt@bbc.co.uk on 2015-03-19)
- Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-03-18)
- Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from glenn@skynav.com on 2015-03-05)
- Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-03-05)
- Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from glenn@skynav.com on 2015-03-04)
- Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-03-04)
- Re: [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-02-25)
- [ttml2] Action-369 - collate smpte issues and draft dispositions (from nigel.megitt@bbc.co.uk on 2015-02-06)
- {minutes} TTML Meeting of 24/10/13 (from glenn@skynav.com on 2013-10-24)
- RE: TTML Agenda for 24/10/13 (from mdolan@newtbt.com on 2013-10-23)
- TTML Agenda for 24/10/13 (from nigel.megitt@bbc.co.uk on 2013-10-23)
- 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
May be duplication of Issue 24.
Glenn Adams, 25 Aug 2013, 17:12:17See ISSUE-24
Pierre-Anthony Lemieux, 21 Oct 2013, 20:27:03Duplicate of issue-24
Philippe Le Hégaret, 24 Oct 2013, 15:07:30Addressed in https://dvcs.w3.org/hg/ttml/rev/32a8268a5577
Glenn Adams, 24 Sep 2014, 21:14:06Display change log