Every browser supports asm.js, since it's just a subset of standard JS. Some browsers do optimize it, though. https://en.wikipedia.org/wiki/Asm.js#Implementatio

Every browser supports asm.js, since it's just a subset of standard JS. Some browsers do optimize it, though. https://en.wikipedia.org/wiki/Asm.js#Implementations https://en.wikipedia.org/wiki/Asm.js#Implementations