This is a legitimate question if you really know the answer or can provide some information.
Firefox and Chrome are continually working to include many of the features in ES Harmony...
My question is really 2 parts:
ECMAScript 2015 (ES6) is Partially Supported on Internet Explorer 11. If you use ECMAScript 2015 (ES6) and your users are using Internet Explorer 11, then they would see the feature properly. That doesn't guarantee that other web technologies are also compatible in Internet Explorer 11 though.
Safari, Chrome, Firefox and Edge all support the ES6 Modules import syntax. Here's what they look like. Simply add type="module" to your script tags and the browser will load them as ES Modules. The browser will follow all import paths, downloading and executing each module only once.
The draft is supposed to be feature-complete roughly by the end of this year, and the plan is to finalise the new standard by end of next year. How long it will take browsers to fully implement it is another question (ES6 is gonna be pretty large).
I certainly cannot answer (2), and I suppose even MS themselves cannot at this point. But I know that they have started prototyping some features, like block scoping.
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