Text to Speech proposal

I have attached a proposal for how we could add TTS support to HTML by
introducing a <tts> element that shares a lot of functionality with
<audio>.

This is based on an earlier version that I linked to in a thread in
September (http://lists.w3.org/Archives/Public/public-xg-htmlspeech/2010Sep/0018.html).
The main differences are in examples, clarifications, formatting, and
handling of SSML <mark> elements.

-- 
Bjorn Bringert
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