target selector
Description: Selects the target element indicated by the fragment identifier of the document's URI.
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version added: 1.9jQuery( ":target" )
If the document's URI contains a fragment identifier, or hash, then the :target selector will match the element with an ID that matches the identifier. For example, given a document with a URI of http://example.com/#foo, $( "p:target" ) will select the <p id="foo"> element.
Further discussion of this usage can be found in the W3C CSS specification.