ISSUE-41: change the default time container semantics of body as par

timeContainer default value

change the default time container semantics of body as par

State:
CLOSED
Product:
TTML 1.0
Raised by:
Sean Hayes
Opened on:
2008-12-11
Description:
All of the test suite examples look like the following:
...
</head>
<body>
<div>
<p tts:color="red"begin="0s" end="10s">This text must be red.</p>
</div>
</body>
</tt>

However the semantics here are in fact that nothing gets displayed:

Spec:

If no timeContainer attribute is specified, then a body element must be interpreted as having sequential time containment semantics

And (constraints on SMIL semantics)

The implicit duration of body, div, p, and span (whether anonyous or not) is defined as follows: if the element's parent time container is a parallel time container, then the implicit duration is equivalent to the indefinite duration value as defined by [SMIL 2.1]; if the element's parent time container is a sequential time container, then the implicit duration is equivalent to zero.

Thus since the div is in a sequential context, and neither dur nor end is specified, its active duration is 0.

Since we probably don’t want this behaviour, I suggest we either change the default time container semantics of body as par, or fix all of the test suite cases where this occurs.
Related Actions Items:
No related actions
Related emails:
  1. Agenda for TT telecon 9th April (from Sean.Hayes@microsoft.com on 2009-04-09)
  2. [minutes] Timed Text Working Group Teleconference 20090220 (from plh@w3.org on 2009-02-20)
  3. Default time containment semantics for body (Was: TTAF1-DFXP WD Editor's Copy Update - 20090130) (from plh@w3.org on 2009-02-20)

Related notes:

http://lists.w3.org/Archives/Public/public-tt/2008Dec/0106.html

Philippe Le Hégaret, 11 Dec 2008, 13:24:10

resolved in TTAF1-DFXP 20090415 update

Glenn Adams, 16 Apr 2009, 02:54:47

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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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