URI fragment
The fragment identifier introduced by a hash mark # is the optional last part of a URL for a document.The generic RFC 3986 syntax for URIs also allows an optional query part introduced by a question mark ?.Fragments depend on the document MIME type and are evaluated by the client (web browser).Web browsers typically display the top of the document for an empty fragment.The fragment identifier functions differently to the rest of the URI: its processing is exclusively client-sided with no participation from the web server, though the server typically helps to determine the MIME type, and the MIME type determines the processing of fragments.