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BOOK: Professional JavaScript for Web Developers 3rd edition
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Old July 11th, 2012, 07:08 AM
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Default JavaScript history and ECMA-262 version 2

Hi everyone.
In page 4 of chapter 1 there is a topic that I don't understand. This topic is related with the following sentence:

"ECMAScript implementations tipically don't use the second edition (referred to second edition ECMA-262) as a measure of conformance".

Did no browser use ECMA-262 version 2 for the implementation of Javascript?. And then, why ECMA-262 version 2 was made if no vendor browser used it?.

Sorry if somebody don't understand my english language; I'm not a native english.

Last edited by eduardo_bpe; December 12th, 2012 at 08:10 AM.. Reason: spelling correction
Old June 12th, 2015, 12:58 PM
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Hey eduardo,

The answer lies in the couple sentences beforehand:

"The second edition of ECMA-262 was largely editorial. The standard was updated to get into strict agreement with ISO/IEC-16262 and didn't feature any additions, changes or omissions."

From the browser perspective, 1 & 2 are the same, so there are no new changes to implement.

The table on page 6 illustrates Netscape Navigator and Internet Explorer had already implemented Edition 1 before Edition 2, whereas Opera began their ECMAScript implementation when Edition 2 was already complete.

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