ISSUE-214: Negative padding lengths should be prohibited.

negative padding

Negative padding lengths should be prohibited.

State:

CLOSED

Product:

TTML 1.0

Raised by:

Glenn Adams

Opened on:

2013-05-26

Description:

I just noticed that, unlike fontSize and lineHeight, we don't specify that padding lengths must be non-negaive. Rather we have the following language:

"If a specified value of this attribute is not supported, then a presentation processor must interpret the attribute as if the value 0px were specified."

I believe this was an oversight, since CSS 2 [1] states

"Unlike margin properties, values for padding values cannot be negative."

[1] http://www.w3.org/TR/2008/REC-CSS2-20080411/box.html#padding-properties

To resolve, I will add language proscribing negative lengths to section 8.2.1.6 [2].

[2] https://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttaf1-dfxp.html#style-attribute-padding

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 Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
5. TTML Agenda for 20/06/13 -- update -- (from Sean.Hayes@microsoft.com on 2013-06-19)
6. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-19)
7. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
8. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
9. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
10. TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from Sean.Hayes@microsoft.com on 2013-06-17)
11. TTML Agenda for 30/05/13 (from Sean.Hayes@microsoft.com on 2013-05-29)
12. ISSUE-214 (negative padding): Negative padding lengths should be prohibited. [TTML 1.0] (from sysbot+tracker@w3.org on 2013-05-26)

Related notes:

Display change log