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RE: ISSUE-163 (Cell units): Clarify use of cell units in certain properties [DFXP 1.0]

From: John Birch <John.Birch@screensystems.tv>
Date: Tue, 13 Mar 2012 09:23:38 +0000
To: Timed Text Working Group <public-tt@w3.org>
Message-ID: <0981DC6F684DE44FBE8E2602C456E8ABFC31B8@SS-IP-EXMB-01.screensystems.tv>
Further: There appears to be nothing preventing the use of a fractional cell value for length... so 0.1c is permissible. :-)
However, I agree that there is no clarity as to how that is converted into a pixel value when the cell is non square.
Should one use the average of the x and y cell dimensions, the larger, or the smaller, or perhaps the matching direction dimension (e.g. top/before padding would be relative to cell height).
Of course the actual differences in calculated pixel values between these are 'likely' to be very small... but at least in the case of padding... could be noticeable.

Best regards,
John Birch

-----Original Message-----
From: Timed Text Working Group Issue Tracker [mailto:sysbot+tracker@w3.org] 
Sent: 12 March 2012 13:46
To: public-tt@w3.org
Subject: ISSUE-163 (Cell units): Clarify use of cell units in certain properties [DFXP 1.0]

ISSUE-163 (Cell units): Clarify use of cell units in certain properties [DFXP 1.0]


Raised by: Sean Hayes
On product: DFXP 1.0

Some properties that take a length as a value, e.g. border,  textOutline, and padding (one value supplied) do not forbid a cell unit. It is not clear to me what pixel value one would assign to these lengths if the cell in not a square. We should either prohibit cell in these contexts, or define which length is intended.

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Received on Tuesday, 13 March 2012 12:12:04 UTC

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