I read both links below
http://en.wikipedia.org/wiki/ECMAScript
What is the difference between JavaScript and ECMAScript?
My question is, does ECMAScript exist as something that I can download and use instead of JavaScript?
It’s just the standard that dictates the implementation of the javascript language, it’s not what you “download and run”. You can write your code against the ECMAScript specification and pretty much expect it to run on all javascript interpreters (or that idea anyway ;-))
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