How do I know which version of Javascript I’m using?

Wikipedia (or rather, the community on Wikipedia) keeps a pretty good up-to-date list here.

  • Most browsers are on 1.5 (though they have features of later versions)
  • Mozilla progresses with every dot release (they maintain the standard so that’s not surprising)
  • Firefox 4 is on JavaScript 1.8.5
  • The other big off-the-beaten-path one is IE9 – it implements ECMAScript 5, but doesn’t implement all the features of JavaScript 1.8.5 (not sure what they’re calling this version of JScript, engine codenamed Chakra, yet).

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