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jQuery.browser
We recommend against using this property, please try to use feature detection instead (see jQuery.support). Contains flags for the useragent, read from navigator.userAgent. While jQuery.browser will not be removed from future versions of jQuery, every effort to use jQuery.support and proper feature detection should be made.
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event.which
For key or button events, this attribute indicates the specific button or key that was pressed.
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jQuery.unique()
Sorts an array of DOM elements, in place, with the duplicates removed. Note that this only works on arrays of DOM elements, not strings or numbers.
