> HTML4 was developed by World Wide Web consortium and WHATWG (web hypertext application technology working group) and HTML5 is being developed by web hypertext

> HTML4 was developed by World Wide Web consortium and WHATWG (web hypertext application technology working group) and HTML5 is being developed by web hypertext application technology working group (WHATWG) and W3C HTML WG. That's not right. HTML4 was finalized in 1998 but WHATWG wasn't formed until 2004 - and it was formed in response to the W3C pushing the compatibility-breaking XHTML as a successor to HTML4.