The Platform Preview is an early look at the Internet Explorer 9 platform so some features are incomplete, some may change, and some may be added.
Microsoft asks that you refrain from providing feedback on features where noted that they are either partially implemented or not available. Microsoft is aware of their condition and will provide updates in future releases. Similarly, for known issues, Microsoft is also aware of their existence and are actively working on them.
Using and setting the home pageThe default home page of the Platform Preview is the Internet Explorer 9 Test Drive site, which you can use to see demos for and information about the new Internet Explorer 9 platform. You can press F10 at any time to go to your home page.
To change your homepage, right click the Internet Explorer Platform Preview icon in the Start menu and choose Properties. In the Target field on the Shortcut tab add your home page URL to the end of the path
Developer ToolsThe Platform Preview includes built-in Developer Tools. These tools help developers debug and understand the interaction between their sites and the browser. To open the Developer Tools, click the Debug menu and click Developer Tools, or press F12.
The status bar indicates when the page generates script errors. You can use the Developer Tools to get more information about and debug script errors.
Article : Internet Explorer 9 Platform Preview 4 1.9.7916.6000
