The IE 9 Platform Preview doesn’t 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. There’s no back button and no built-in security. It’s basically the IE 9 rendering engine and early developer tools.
Microsoft officials will show off the IE 9 developer preview and discuss Microsoft’s 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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