We built a simple JavaScript framework using the HTML 5 video element to enable page element changes to be synchronised with the current position of a video.
Click here to view a demonstration, based on R&D TV, episode 2. This prototype will only work in current versions of Firefox, Safari and Chrome.
There's more information about what we built here.
If you have comments, questions, or suggestions, please e-mail us at rad@bbc.co.uk