ACTION-221: Double check spec language on css and xsl-fo around line height stacking strategy

Double check spec language on css and xsl-fo around line height stacking strategy

State:
closed
Person:
Glenn Adams
Due on:
October 24, 2013
Created on:
October 17, 2013
Related emails:
  1. Re: Line Height stacking strategy algorithm - approval needed (from pal@sandflow.com on 2014-01-22)
  2. Re: Line Height stacking strategy algorithm - approval needed (from pal@sandflow.com on 2014-01-21)
  3. Re: Line Height stacking strategy algorithm - approval needed (from glenn@skynav.com on 2014-01-20)
  4. Re: Line Height stacking strategy algorithm - approval needed (from nigel.megitt@bbc.co.uk on 2014-01-20)
  5. Re: Line Height stacking strategy algorithm - approval needed (from pal@sandflow.com on 2014-01-17)
  6. Line Height stacking strategy algorithm - approval needed (from nigel.megitt@bbc.co.uk on 2014-01-17)
  7. {minutes} 16/1/14 TTWG meeting (from nigel.megitt@bbc.co.uk on 2014-01-16)
  8. {agenda} 16/1/14 TTWG meeting (from nigel.megitt@bbc.co.uk on 2014-01-16)
  9. TTWG Agenda for 9/1/14 (from nigel.megitt@bbc.co.uk on 2014-01-08)
  10. Minutes for 12/12/13 (from nigel.megitt@bbc.co.uk on 2013-12-12)
  11. TTWG Agenda for 12/12/13 (from nigel.megitt@bbc.co.uk on 2013-12-11)
  12. Re: TTWG Agenda for 5/12/13 (from nigel.megitt@bbc.co.uk on 2013-12-11)
  13. Re: TTWG Agenda for 5/12/13 (from glenn@skynav.com on 2013-12-11)
  14. RE: TTWG Agenda for 5/12/13 (from mdolan@newtbt.com on 2013-12-10)
  15. TTWG Agenda for 5/12/13 (from nigel.megitt@bbc.co.uk on 2013-12-04)
  16. Re: TTML Agenda for 21/11/13 (from cyril.concolato@telecom-paristech.fr on 2013-11-21)
  17. Re: TTML Agenda for 21/11/13 (from glenn@skynav.com on 2013-11-21)
  18. Re: TTML Agenda for 21/11/13 (from tmichel@w3.org on 2013-11-21)
  19. TTML Agenda for 21/11/13 (from nigel.megitt@bbc.co.uk on 2013-11-20)
  20. RE: TTML Agenda for 31/10/13 (from Sean.Hayes@microsoft.com on 2013-10-31)
  21. TTML Agenda for 31/10/13 (from nigel.megitt@bbc.co.uk on 2013-10-30)
  22. {minutes} TTML Meeting of 17/10/13 (from glenn@skynav.com on 2013-10-17)

Related notes:

Determined that CSS2.1 is ambiguous regarding to resolution of 'normal', specifically in the language "When an element contains text that is rendered in more than one font, user agents may determine the 'normal' 'line-height' value according to the largest font size." [1], which language we had previously used to specify use of "largest font size". After consulting with CSS WG members, determined that "largest font size" was intended to correspond to "font metrics producing largest sum of ascent, descent and line gap for fonts that applied to immediate text node children of paragraph, and ignoring font size of span children of paragraph".

As a result of this review, completely revise language regarding resolution of 'normal' in TTML2, about which see https://dvcs.w3.org/hg/ttml/rev/4b056bc52a0d.

[1] http://www.w3.org/TR/CSS2/visudet.html#leading

Glenn Adams, 5 Dec 2013, 22:53:02

Display change log.

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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