A few points: I'm not sure what you mean by "Record audio and video", but there is a device access API for webapps to get to webcams, mics, video game controll

A few points: I'm not sure what you mean by "Record audio and video", but there is a device access API for webapps to get to webcams, mics, video game controllers, etc. Mozilla's audio api also allows Javascript to generate raw audio data, and I expect (well, certainly hope) that this will be adopted by the other browsers as well. Video overlays - I'm not sure what you meant since there are a few different terms like this. If you mean routing the video data in a certain way, you're right, I don't see that happening. If you mean overlaying one video on top of another (or anything like that), that's already possible - check out http://html5doctor.com/video-canvas-magic/ http://html5doctor.com/video-canvas-magic/ The rest of it you may be right. DRM will have to be browser-specific, and it's likely to fit in at all with an OSS project. Multi-threading seems like it would likely require a change to the Javascript implementations.