Version 1.4.2
All the aspects of the API that were added, or had a new signature added, in the corresponding version of jQuery.
jQuery 1.4.2 Release Notes.
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.delegate()
Attach a handler to one or more events for all elements that match the selector, now or in the future, based on a specific set of root elements.
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.undelegate()
Remove a handler from the event for all elements which match the current selector, based upon a specific set of root elements.