Selects the target element indicated by the fragment identifier of the document's URI.
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 https://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.