Windows Internet Explorer 9 (abbreviated as IE9) is the upcoming version of the Internet Explorer web browser from Microsoft. It is currently available as a public beta version, released on September 16, 2010.
IE9 supports all CSS 3 selectors, border-radius CSS 3 property, improved JavaScript performance, and embedded ICC v2 or v4 color profiles support via Windows Color System. It also features hardware-accelerated graphics rendering using Direct2D, hardware accelerated text rendering using DirectWrite, hardware accelerated video rendering using Media Foundation, imaging support provided by Windows Imaging Component, and high fidelity printing powered by the XPS print pipeline.
IE9 also supports the HTML5 video and audio tags and the Web Open Font Format. Some industry experts claim that Microsoft will release IE9 as a major out-of-band version that is not tied to any particular version of Windows.
The system requirements for IE9 are Windows 7 or Windows Vista SP2 (with Platform Update and IE8); Windows XP is not supported. Both 32-bit and 64-bit builds are available.
Check out the performance ,Demos ,etc at Microsoft official website