This page is for Web-wide linking convenience. It is intended to contain generally useful links to reliable sources, particularly pages where they offer important information which users frequently refer to. It is part of a family of pages across Wikia, based at the Programmer's Wiki. * W3C Markup Validation Service * XHTML 1.1: the current standard * HTML 4.01: the most recent version which was not based on XML * HTML 5: the next version, which will only include XHTML syntax for advanced uses