This might be a brilliant idea, on par with asm.js. Mozilla can implement it like they they did with asm.js, after all it is a subset, not a superset. It will

This might be a brilliant idea, on par with asm.js. Mozilla can implement it like they they did with asm.js, after all it is a subset, not a superset. It will then work in all browsers but (I guess) can be made to work much faster if the browser knows it can ignore the piles of old hacks that full html has to consider. Edit: and like asm.js it might lead to something even better going forward.