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

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.

Best regards,
John


From: Glenn Adams [mailto:glenn@skynav.com]
Sent: Wednesday, April 25, 2012 04:00 PM
To: John Birch
Cc: Andreas Tai <tai@irt.de>; public-tt <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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