Yes. There's some working demos available which aim to explore this area so it can be standardised:<p><a href="http://blog.gingertech.net/2009/10/06/new-proposal-for-captions-and-other-timed-text-for-html5/" rel="nofollow">http://blog.gingertech.net/2009/10/06/new-proposal-for-capti...</a>