Internet Explorer 9 Preview 4 预览版第四版下载：
What's new in Internet Explorer 9 Platform Preview 2 1.9.7766.6000:
Features Available:
- IE9 User Agent String
- getElementsByClassName
- characterSet
- CSS3 Media Queries
- HTML5 Events
- DOMContentLoaded
- DOM Core
- DocumentType, ProcessingInstruction, createDocument
- DOM Traversal
- DOM L3 Events
- DOMAttrModified, Composition events
Features Partially Implemented :
- DataURI
- Support in script source
Developer Tools Features Available :
- User Agent String Picker
- A new tool that can be used to change the user agent string that IE sends with every request. The tool comes with some built in presets and new custom user agent strings can be added.
- Console Tab
- The console window is now a full tab and has been expanded to include the logging of diagnostic information from IE.
- Network inspection improvements
- Shortened URL
- Color coding for errors
- Scaling units (eg. 500 ms becomes 0.5 s)
下载地址：http://download.microsoft.com/download/0/7/0/07051518-20A3-43E6-B3E3-C6176D92B6DA/iepreview.msi
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