The document is a presentation about new features in Internet Explorer 9 for web developers. It summarizes that IE9 has improved support for HTML5, CSS3, SVG and passes more ACID3 tests compared to previous versions. Specifically, it now supports features like border-radius, CSS selectors like :nth-child(), RGBA/HSLA colors, @font-face fonts using WOFF format and media queries for responsive design. Developer tools have also been improved in IE9 for debugging web pages.