According to Microsoft, Internet Explorer 9, currently in development, will have complete or nearly complete support for all CSS 3 selectors, border-radius CSS 3 property, faster JavaScript, and hardware accelerated rendering using Direct2D and DirectWrite. During the October 2009 Typ09 conference, Microsoft was reported as saying that it was ‘considering’ supporting WOFF in Internet Explorer 9. WOFF is “a strong favourite” for standardization by the W3C Web Fonts Working Group.

Microsoft has continued to downplay the importance of passing the Acid3 test, but speculation that IE 9 would support the SVG W3C recommendation was ignited when Microsoft announced they had joined the SVG Working Group. The build of IE 9 presented on the PDC, scored 32/100, up from 20/100 for Internet Explorer 8.
At MIX10, a new preview was released that featured support for CSS3 and SVG, a new Javascript engine called Chakra, and a score of 55/100 on the Acid3 test. The final build of Internet Explorer 9 is expected to be released in 2011. Support for the HTML5 video and audio tags was also promised. Some industry experts claim that Microsoft will release IE 9 as a major out-of-band version that is not tied to any particular version of Windows. According to[2], the system requirements are Windows Vista SP2 (With Platform Upgrade) and Windows 7. IE8 is also required.

Sinofsky refuse to hint at a release date, few expect IE 9 to appear significantly earlier than Microsoft’s usual two-year browser roll-out - which would see a full release in early 2011.