The wilderness Downtown. This is one of the latest examples in the Google Chrome HTML5 Experiments site.
As they explain the “experience”:
“Choreographed windows, interactive flocking, custom rendered maps, real-time compositing, procedural drawing, 3D canvas rendering… this Chrome Experiment has them all. "The Wilderness Downtown" is an interactive interpretation of Arcade Fire’s song "We Used To Wait" and was built entirely with the latest open web technologies, including HTML5 video, audio, and canvas.”
And to be honest, it is looking very closely like what a browser-based music-video should look like. I think….