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html5test.com doesn't include generators or other JS language features. Instead, see http://kangax.github.io/compat-table/es6/

I think it's disappointing that Safari lags behind as much as IE does. http://kangax.github.io/compat-table/es6/

That's not true. If you look at http://kangax.github.io/compat-table/es6/ you'll see IE11 preview (their "canary") has more green than any other browser including Chrome or Firefox. Yes, even more than Firefox nightly or Chrome canary.

> their "canary"

while that's sort of true, the big distinction is that the features in their "canary" aren't going to hit "stable" for another year or so, which is a lot of iterations of Firefox and Chrome in the meantime.

However, it is fantastic to see where they're headed with IE12.