From Joomla! Documentation
The "API15" namespace is an archived namespace. This page contains information for a Joomla! version which is no longer supported. It exists only as a historical reference, it will not be improved and its content may be incomplete and/or contain broken links.
|token||Displays a hidden token field to reduce the risk of CSRF exploits|
jimport( 'joomla.html.html.form' );