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New Event APIs: .on() and .off()
The new .on() and .off() APIs unify all the ways of attaching events to a document in jQuery — and they’re shorter to type!
Improved Performance on Delegated Events
Better Support for HTML5 in IE6/7/8
Inside jQuery we've found several situations where we need to know if an argument is numeric, or would be successfully converted to a number if it is some other type. We decided to write and document jQuery.isNumeric() since it's a useful utility. Pass it an argument of any type and it returns true or false as appropriate.