Web Hypertext Application Technology (WHAT) is released and created by Apple, Mozilla, and Opera (started in 2004).
XHTML crew joins HTML5 due to downfall of XHTML support. (Mainly they realized it was bad). (jan 1, 2008 – jan 1, 2010)
Description:
https://blog.rackspace.com/internet-history-html-evolution
Added to timeline:
HTML Timeline
Date: