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IE9 (Internet Explorer 9) supports ECMAScript 5 support and more enhanced scripting

Internet Explorer 9‘s third platform preview comes with improved and new JavaScript performance in the “Chakra” engine.

“As context, the industry standard that defines the JavaScript language is ECMA-262: ECMAScript Language Specification developed and published by Ecma International. Prior to last year, it had been a decade since the introduction of the Third Edition of ECMA-262 in Dec 1999. In Dec 2009 Ecma approved the Fifth Edition of ECMA-262 as the successor to the Third Edition (a Fourth Edition was never published), and last year we debuted elements of ECMAscript 5 (ES5) support when we added native JSON support in IE8. Beyond JSON, though, ES5 standardizes many significant enhancements to the JavaScript language,” explains Microsoft.

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