IE9 Final Preview Released
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Microsoft's SunSpider benchmark of this preview release puts it ahead of every browser except Chrome 5+ and Opera 10.6.
Microsoft's Acid3 benchmark of IE9 preview 4 also had marked improvement. It improved 14% since preview 3 with a score of 95/100. The final 5 % of the web standards score consists of "in transition" specs, according to Microsoft, so it's unlikely that they'll get full support until there is consensus.
So far, Microsoft has contributed 519 new tests to web standards bodies with preview 4. They've contributed a total of 2,138 during the whole of IE9 development so far. Here's a look at how compatible Microsoft's submitted tests are across several browsers.
The fourth IE9 developer preview can be downloaded here. At the Web 2.0 Expo in May, Microsoft said that IE9 would not run on Windows XP. Hope you're ready to upgrade.
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