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.

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.