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Now ECMAScript has had a few different editions, but the one we care about is edition 3, which may surprise you. It was published way back in 1999, but that's the one that you can reliably assume full support for in every major browser, and it's the one we're going to focus on in this course. ECMAScript Version 5 was published at the end of 2009 and adds a few features to the language, particularly in the advanced area.
But I'm recording this course in mid-2011. ECMAScript 5 is only now getting some support in the most recent browser versions. Adoptions of standards like this take years, and yes, at some point in the future ECMAScript 5 will be the standard, but it isn't yet. And just to let you know, compatibility was a big deal in development of ECMAScript 5, so everything we do in this course will be compatible moving forward and it will also work in all the older browsers for many years to come. Now if you're wondering what happened to ECMAScript 4 in those ten years between edition 3 and edition 5, well it just got way out of hand and they abandoned it; ECMAScript 4 never happened.
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