Microsoft is currently inviting testers to an Internet Explorer 9 technical feedback program.
The program is open to those who were top bug filers for the Internet Explorer 8 beta. Several testers began receiving emails over the weekend inviting them to the technical feedback program. Microsoft recently released a developer preview build of Internet Explorer 9. The preview build does not include the UI elements of Internet Explorer 9 but allows developers to test the new JavaScript engine and HTML5/CSS3 support. Microsoft has said it will update the preview build regularly. In an email to testers, Justin Saint Clair - Program Manager of Internet Explorer invited testers to join a "select group of IE9 Tech Feedback participants."
Microsoft originally unveiled Internet Explorer 9 at PDC 2009. IE 9 will take advantage of the power of the GPU for all page rendering and developers can exploit this using CSS, DHTML and javascript. A new JS engine (codenamed Chakra) will also be built into Internet Explorer 9 with greater interoperability and standards support all round. Features such as rounded corner CSS support will be built in. In January, Neowin revealed that Microsoft is planning to enhance tabbed browsing in IE9. According to a software patent, the Quick Tabs feature in Internet Explorer is likely to be enhanced with better functionality and greater tab management options.