Tonight I passed the W3 Schools HTML certification correctly answering 66 out of 70 questions. The certification can be verified here:
http://www.refsnesdata.no/certification/cert_diploma_html.asp
Username: matt@matthewstevenkelly.com

The HTML Developer Certificate is for developers who want to document their knowledge of HTML 4.01, XHTML, and CSS.

To pass the examination the developer must have a fundamental knowledge of:

• The Hypertext Markup Language – HTML 4.01
• The Extensible Hypertext Markup Language – XHTML 1.0
• Cascading Style Sheets – CSS1 and CSS2

It is based off of the standards produced by the World Wide Web Consortium

More infomation about the Consortium can be found here