Rollup captions: an analysis and suggestion

Hi all,

Here is an in-depth analysis of the requirements and most of the
proposals that have been made previously on this mailing list:

http://www.w3.org/community/texttracks/wiki/RollupCaptions

I apologize if I've missed your proposal - do add your proposals!

My suggestion would be to go with something that is similar to the
last proposal (an explicit introduction of rendering areas). This will
also help when we want to move captions through user interaction to a
different screen location.

Cheers,
Silvia.