After the first preview shown and made available at MIX 2010 in March, Internet Explorer 9 Platform Preview 3 is now available for download and testing. This is, as with the previous two versions, a preview build without any navigation functionality. It’s really made to let you test the rendering and performance.
Read the full post by the IE team: HTML5, Native- Third IE9 Platform Preview Available for Developers.

We encourage you to try out this build and participate by giving your feedback.

Lots new stuff, a few highlights:

• <canvas> tag support
• WOFF (Web Open Font Format) support
• <audio> and <video> tags now available (GPU-powered). To learn more about the HTML5 video support I recommend these blog posts from the IE team: HTML5 Video, Follow Up on HTML5 Video in IE9, and Another Follow-up on HTML5 Video in IE9
• Improved support for previously announced standards (HTML5, CSS3, DOM L2&L3, EcmaScript5)
• New demos live on IE9 Test Drive

Download, test your sites, give feedback and give the special Test Drive demos a spin!