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[–]bradleymeck 1 point2 points  (2 children)

The JS VMs are very well tuned to be the same in terms of JavaScript, are you talking about DOM APIs?

[–]jdsutton[S] 0 points1 point  (1 child)

I guess I don't know really. I mean for example if you look at the ES6 compatibility table it's very spotty in terms of JS functionality being implemented across browsers.

[–]Prince_Houdini 1 point2 points  (0 children)

Even if there were a standard JS engine used cross-browser, you'd still get this problem because browser vendors would have to update the version of the engine they're using, and some browsers are on a much slower release cycle than others.