Answer Posted / anil

JavaScript language is officially standardized as ECMAScript
(ECMA-262) by European Computer Manufacturers Association
(ECMA) International. it is internationally oriented body
embraced by Microsoft and holding the standards for C#, CLI
and Open XML.

Microsoft's own version of JavaScript is JScript and it is
mostly compatible with ECMAScript v.3. The intersection
between these three variations of the same language is at:

# JavaScript 1.5 (without DOM)
# JScript as supported by IE6 (still the most widely used
browser)
# ECMAScript ver. 3


The largest difference between JavaScript and JScript is
actually interpreter/runtime related and not language
specific. IE6 was known for some notorious performance
issues related to its non-generational garbage collector
when operating on large object trees.

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