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All modern browsers (no that does not include IE11) have full ES2016 support in their stable version.

In fact, aside from Edge which lags a bit behind (and FF 52 ESR) all of them seem to have full ES2017 support already in their latest stable.

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No. Firefox and Chrome don't have proper tail call optimizations.

up to 12% of internet users still use IE11, and even more if you count lower versions. It will take them about a decade to upgrade to a "modern browser". There are still large companies who want browser compatibility down to IE 8.

That's not a matter of "browser compatibility" which is what GP complained about. The browsers are compatible, if you decide not to use them, you can hardly fault the browsers.

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