The IE 9 Platform Preview doesnt include the IE 9 user interface; instead, it is the plumbing, specifically the new Microsoft JavaScript engine (which is codenamed Chakra) and the new graphics subsystem, coupled with a home page full of test sites. Theres no back button and no built-in security. Its basically the IE 9 rendering engine and early developer tools.
Microsoft officials will show off the IE 9 developer preview and discuss Microsofts planned support for more of the emerging HTML5, CSS3 and SVG2 standards with that product during the Tuesday morning Mix 10 keynote.
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