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

On Wed, Apr 25, 2012 at 9:33 AM, John Birch <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]
> *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>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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