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I stopped reading this as soon as I got to the "negative point" that Microsoft thanked JQuery for supporting IE9.

Libraries such as JQuery of course have to support major versions of all browsers. In particular in this case much of the work was disabling workarounds required in earlier versions of IE!

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Mozilla actually run the unit tests of most major libraries as part of their regular test suite to make sure that the Internet will by-and-large still work on any new release. So I think the author has a valid point here, new browsers shouldn't break existing libraries this badly.

Webkit (recently) and Opera (last year) also incorporated jQuery's test suite into their own.

Perhaps, but as the parent post had stated: the changes to JQuery were to get rid of workarounds for past versions of IE. If Microsoft kept bug-for-bug compatible with older versions of IE, they'd be lambasted for that. Now you're lambasting them for actually fixing things. Rock, meet hard place.

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