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Many parts of the fourth edition, which was abandoned due to disagreements over its complexity, formed the basis of 2009’s ECMAScript edition 5, which was a huge success. It was released in 2009, and by 2013, all major browsers — Internet Explorer included — were in full compliance.
The ambitious sixth major edition of the standard, called ES6 and codenamed “Harmony,” was released in 2015. Like ES5, it was a major success and all major browsers were in full compliance by spring 2017.
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