ttml - What happens if different region attribute values are specified on parent and child? -


suppose have following ttml document:

<tt xml:lang="en" xmlns="http://www.w3.org/ns/ttml" xmlns:tts="http://www.w3.org/ns/ttml#styling">   <head>     <layout>       <region xml:id="a"/>       <region xml:id="b"/>     </layout>   </head>   <body>     <div region="a">       <p region="b">abc</p>     </div>   </body> </tt>

according 9.3.2 intermediate synchronic document construction, visual marks produced regions a , b?

at first expecting a produce nothing , b produce abc, specification seems contradict implying anonymous span abc pruned (directly or indirectly) both when evaluating region a , b, seems bit counter-intuitive.

the algorithm prunes content , nothing displayed. captured on w3c ttwg issue tracker in issue-341.

why author document behaviour though - mean, intend happen? under conditions not achieve same thing removing region reference div? ask interest - if there's use case here can use drive spec development in ttml.


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