The world is developing too fast and there are many reasons for its rapid development the main reason is the new things appearing in the computer, restless search is taking place in inventing new languages so once it is approved by the people then within no time the other one is appearing. HTML5 is a technology developed by the WHATWG, it is a open community started by four major browser vendors these vendors are Mozilla, opera and apple, this HTML5 is not the replacement of HTML 4.01 or XHTML, it is an evolution, the aims of it are big it tries
"HTML5 (also sometimes referred to as Web Applications 1.0) is a technology developed by the WHATWG, an open community started by three of the four major browser vendors: Mozilla, Opera, and Apple. HTML5 is not so much a replacement for HTML 4.01 or XHTML 1.0 as it is an upgrade or evolution. It aims for backwards compatibility, tries to remove undefined behavior in HTML 4.01 by defining it, and looks at the various browsers’ tag-soup parsing behavior to try to define the best solution that doesn’t break the web. At the same time, it adds sorely
If you've had difficulties getting your web page to display correctly in more than one browser, you're not alone. The unlikely culprit might just be in the Doctype tag that you may or may not have added to your document.
QuirksMode goes into significant depth on the issue: "When Netscape 4 and Explorer 4 implemented CSS, their support did not match the W3C standard (or, indeed, each other). Netscape 4 had horribly broken support. Explorer 4 came far closer to the standard, but didn't implement it with complete correctness either. Although Explorer
Membership and Participation
This Working Group is expected to have active participation of a diverse community, including browser vendors, authoring tools developers, content developers, etc. A full list of participants is available. A number of Working Group members answered a survey about background experience and expertise.
By charter, we operate primarily by email (see public-html archive), supplemented by web-based surveys, occasional teleconferences, and up to two in-person meetings per year. Some participants supplement these with IRC