IE 9 focuses very much on three key themes: Best interoperable HTML5, Hardware Accelerated Graphics, and High Performance Browser. IE9 will include extensive support for DOM, CSS3, SVG standards and XHTML. IE9 uses Windows’ modern graphics APIs and the PC’s hardware to accelerate all graphics and text that the browser draws on screen. A basic example involves a small, simple web page that animates images, having them follow the mouse pointer:
“Doing HTML5 right – our intent from the start – is more about designing our browser’s subsystems around what these new apps will need than it's about a particular set of features. From beginning, we approached IE9 with the goal of enabling professional-grade, modern HTML5 support on top of modern hardware through Windows,” said IE blog on HTML5, Hardware Accelerated: First IE9 Platform Preview Available for Developers.