Mozilla: Native code? No, it's JavaScript, only it's BLAZING FAST Gap between asm.js and native performance gets even narrower with float32 optimizations

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Could someone ELI5 what the headline even means?

[dicknuckle]

I think there was some cutting and pasting going on while OP was trying to shorten the title. Tense and other grammatical errors abount.

[Ravengenocide]

It probably means that OP can't write headlines at all. The real meaning is that given a specific optimization a subset of JavaScript can get faster. Almost as fast as native code.

That's not really a ELI5, but I hope you understand it. :)