Yep, MDN is the best place to search for how specific JS features are supposed to work.
They all follow the same spec but not all browsers have implemented the the newer features.
There’s a section at the bottom of each page on browser compatibility.
Even though it isn’t the official reference it is far more readable than the official reference and it has very few errors.
You’ll find that the MDN site covers ES6 as well as earlier versions - e.g.
let was introduced under ES6. If you scroll down towards the bottom of that page I linked to, you’ll see that it indicates which version of the specification that particular statement was introduced under.
That left out that ECMAScript 2016 (sometimes referred to as ES7) was release in June this year.
It’s perhaps better covered on that point here - https://en.wikipedia.org/wiki/ECMAScript
Does all js engines can run with node.js? Or there is a separate js version?
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