That must be why asm.js v0.1 already introduced non-standard language extensions (imul) and has a roadmap full of more. Which browsers does the asm.js of today

That must be why asm.js v0.1 already introduced non-standard language extensions (imul) and has a roadmap full of more. Which browsers does the asm.js of today run on? And which browsers will the asm.js of the future run on?