Producing web pages
* HTML CSS DHTML XHTML A to Z of tags        Accessibility          Design

11.1 Use W3C technologies

Build web pages with technologies that are endorsed by the World Wide Web Consortium (W3C) and are capable of delivering the functionality you require to implement a user requirement. Work with the most recent specification of whatever W3C technology you choose for a particular development.

W3C technologies include standardised versions of HTML, XML, style sheets, multimedia and many other technologies. They are non-proprietary, which means that they are more likely to be usable across a wide variety of browsers and user agents.