Category:OutputPageBeforeHTML extensions

The  category contains extensions that intercept processing after all templates>Special:MyLanguage/Help:Templates|templates, pfunc>Special:MyLanguage/Manual:Parser functions|parser functions, and variables>Special:MyLanguage/Manual:Variables|variables in wiki text has been expanded, but before the wiki text has been converted to HTML.

They are implemented by attaching a function to the OutputPageBeforeHTML hook.