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Cell Grid Safe Area [was Re: ISSUE-163 (Cell units): Clarify use of cell units in certain properties [DFXP 1.0]]

From: Glenn Adams <glenn@skynav.com>
Date: Tue, 13 Mar 2012 11:40:48 -0600
Message-ID: <CACQ=j+f7DGi6wzMjNhL+G3C9fDcZhJ8st8N0wU=w3MAGGf7jDw@mail.gmail.com>
To: John Birch <John.Birch@screensystems.tv>
Cc: Timed Text Working Group <public-tt@w3.org>
On Tue, Mar 13, 2012 at 11:30 AM, John Birch <John.Birch@screensystems.tv>wrote:

>  Cell grid is taken from root extent, which implies that cell 0, 0 is at
> the top left boundary of the root extent.
>
> Unfortunately in practise this is often undesirable as it is unlikely that
> you would want text placed so close to the boundary of the root extent.***
> *
>
> Is there any *padding* *like* mechanism that would allow a ‘safe area’ to
> be defined around the edge of the ‘virtual grid’ created by cell resolution.
>

We do not define that the root container is coterminous with the visible
screen. The external authoring context determines the origin of the root
container. I believe we have assumed that all of the root container is
within a safe area, but I agree that the spec does not specifically read on
this point.
Received on Tuesday, 13 March 2012 17:41:39 UTC

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