Wikipedia pages are written in the MediaWiki markup language , which supports some HTML coding , and which also allows special coding for wikitables , infoboxes , navboxes , and templates ( see : HELP : Template ) . Wikipedia pages are written in the MediaWiki markup language , which supports some HTML coding , such as or tags , but which also allows special coding for wikitables , infoboxes , navboxes , and templates ( see : HELP : Template or A quick guide to templates ) .