Version 1.1
All the aspects of the API that were added, or had a new signature added, in the corresponding version of jQuery.
jQuery 1.1 Release Notes.
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jQuery.ajaxSetup()
Set default values for future Ajax requests.
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.attr()
Get the value of an attribute for the first element in the set of matched elements.
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event.data
The optional data passed to jQuery.fn.bind when the current executing handler was bound.
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.one()
Attach a handler to an event for the elements. The handler is executed at most once per element.