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Re:JQuery 2.0 Drops Support for IE6/7/8; API-Compatible with... by wycats on Thursday June 28, 2012 @08:48PM (#4174698)
If you look at the second conditional comment, it will not be parsed as a comment in browsers without conditional comment support.

In other words, it will correctly use jQuery 2.0, like any other browser without conditional comment support.

Re:JQuery 2.0 Drops Support for IE6/7/8; API-Compatible with... by seldo on Thursday June 28, 2012 @08:55PM (#4174722)
It's a conditional conditional comment. I feel ill.
Re:JQuery 2.0 Drops Support for IE6/7/8; API-Compatible with... by WickyNilliams on Friday June 29, 2012 @10:01AM (#4176617)
It's known as a downlevel revealed conditional comment. You will see it in use in the HTML5 boilerplate. That said, I echo your sentiment, it is an immensely horrid syntax. For more info: http://css-tricks.com/downlevel-hidden-downlevel-revealed/