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[ttml2] Prune elements whose condition evaluates to false

From: Nigel Megitt via GitHub <sysbot+gh@w3.org>
Date: Fri, 19 Jan 2018 10:54:30 +0000
To: public-tt@w3.org
Message-ID: <issues.opened-289936217-1516359269-sysbot+gh@w3.org>
nigelmegitt has just created a new issue for https://github.com/w3c/ttml2:

== Prune elements whose condition evaluates to false ==
Where are presentation elements pruned if their condition evaluates to false? I propose adding a pruning condition to [construct intermediate document]:

_they are a _presentation related element_ associated with a _condition_ that evaluates to false_

This needs to avoid pruning, say, `style` elements whose condition evaluates to false, because that would break referential styling (a style whose condition is false may reference a style whose condition is true).

To be sure that is the case, we need to modify the term definition of [presentation related element] to explicitly exclude styling elements. This appears to be a harmless change right now.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/583 using your GitHub account
Received on Friday, 19 January 2018 10:54:32 UTC

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