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The World Wide Web Consortium (W3C) HTML Working Group has published a draft of the HTML 5 specification, a major revision to the markup language that powers the Web. The specification is being authored collaboratively by representatives of numerous companies and organizations, including all of the leading browser makers. HTML 5 includes a broad assortment of significant changes and new features that aim to simplify web development and enable further growth of the Internet as a medium.
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Opera currently has the broadest support for HTML 5 features, but is still missing many parts. The rest of the browsers have only bits and pieces implemented at this time. For a more complete overview of HTML 5 support in various rendering engines, you can see this feature matrix at Wikipedia. For additional information, check out the actual HTML 5 draft.
http://arstechnica.com/news.ars/post/20080...s-from-w3c.html--
Presto is a layout engine for Opera
http://en.wikipedia.org/wiki/Presto_%28layout_engine%29--
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Using a simple meta declaration, we can specify the rendering engine we would like IE8 to use. For example, inserting this:
<meta http-equiv="X-UA-Compatible" content="IE=8" />
into the head of a document would make IE8 render the page using the new standards mode. This syntax could be easily expanded to incorporate other browsers as well:
<meta http-equiv="X-UA-Compatible" content="IE=8;FF=3;OtherUA=4" />
http://alistapart.com/articles/beyonddoctype