RE: Padding on tt:p and tt:span elements

Hmm. I was sure I'd created an issue for this, but apparently not.

ISSUE-168<https://www.w3.org/AudioVideo/TT/tracker/issues/168> added to database

________________________________
From: Andreas Tai [tai@irt.de]
Sent: 08 May 2012 6:26 PM
To: Sean Hayes
Cc: Glenn Adams; John Birch; public-tt@w3.org
Subject: Re: Padding on tt:p and tt:span elements

Will there be an entry in the tracker for this?

In addition I attach an html-example that shows the wished behaviour and a CSS definition that is similiar to the needed TTML styles.

Best regards,

Andreas

Am 25.04.2012 21:56, schrieb Sean Hayes:
While what you say is true it is very inconvenient from an authoring perspective, and if the user can set the font (which is a requirement of the FCC rules), then you need the region to be able to adapt. Better to use the <p> background which does adapt naturally. You can artificially introduce the padding using spans with preserved space, however this is a pretty ugly hack. I think it makes sense to allow padding on these elements.

From: Glenn Adams [mailto:glenn@skynav.com]
Sent: 25 April 2012 17:04
To: John Birch
Cc: tai@irt.de<mailto:tai@irt.de>; public-tt@w3.org<mailto:public-tt@w3.org>
Subject: Re: Padding on tt:p and tt:span elements


On Wed, Apr 25, 2012 at 9:33 AM, John Birch <John.Birch@screensystems.tv<mailto:John.Birch@screensystems.tv>> wrote:
You hit the nail on the head. Font size at authoring time is only true if font exists at browser... Otherwise substitution means all bets are off.

not quite; you can always overestimate the size which permits containment without overflow

Best regards,
John


From: Glenn Adams [mailto:glenn@skynav.com<mailto:glenn@skynav.com>]
Sent: Wednesday, April 25, 2012 04:00 PM
To: John Birch
Cc: Andreas Tai <tai@irt.de<mailto:tai@irt.de>>; public-tt <public-tt@w3.org<mailto:public-tt@w3.org>>
Subject: Re: Padding on tt:p and tt:span elements


On Wed, Apr 25, 2012 at 5:22 AM, John Birch <John.Birch@screensystems.tv<mailto:John.Birch@screensystems.tv>> wrote:
In TTML as I understand it(as a result of derivation from xsl:fo?), there is no possible mechanism that can set the region size as a result of a calculation of the rendered text size on the display. In contrast to broadcast practises, in TTML the text is fitted inside a predefined region (or overflows / clips), rather than the region (growing) fitting the text.

it can, if the size can be determined at authoring time; but that will depend on font usage; so you are correct that if the font size is unknown, then you may have to overestimate the size, e.g., by using em or c length units
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