Microsoft unveils IE9 public preview

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Microsoft is showing an early preview of Internet Explorer 9 today at its MIX10 developer conference. The forthcoming release will supposedly mark a major change from previous versions, focusing heavily on performance improvements and standards support -- particularly HTML 5 and SVG. It will also make full use of hardware acceleration for rendering graphics, while a new JavaScript engine, code-named Chakra, compiles JavaScript in the background on a separate CPU core if available.

Microsoft is making a first developer preview of IE 9 available at It is a 31MB download and will run only in Windows 7, Windows Vista Service Pack 2 (SP2) and Windows Server R2. This is not a full-featured browser by any means, but includes the underlying rendering engine and should at least offer a first look at the work Microsoft has done so far. There's no navigation buttons or built-in security, for example.

The development team is committing to delivering an update to the browser code every eight weeks, putting the first such update in mid-May, and to interact with developers via the Microsoft Connect feedback loop as the company moves toward a more full featured beta. Unfortunately, it remains unclear when a public beta would be ready.

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