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The ECMAScript 2015 standard, also known as ES6, is completely supported, bringing this major JavaScript evolution to Safari on macOS and iOS.

Very nice to see ES6 getting implemented by all major browsers.

Obligatory "ES6 is supported but not ES6 modules."

ES6 only defined syntax for modules, it didn't define a way to load modules, that's a different standard

Yes this is exciting. It appears Safari 10 is the only browser today implementing 100% of ES6 according to kangax.