An anonymous reader writes "Microsoft's Internet Explorer 9 development team has announced the availability of the third IE9 platform preview release on the IE blog. Dean Hachamovitch writes, 'The third Platform Preview of Internet Explorer 9, available now, continues the deep work around hardware acceleration to enable the same standards-based markup to run faster. This is the latest installment of the rhythm we started in March, delivering platform preview releases approximately every eight weeks and listening to developers. You'll see more performance, same markup, and hardware-accelerated HTML5.' The announcement focuses on cross-browser compatibility, noting that when 'developers spend less time rewriting their sites to work across browsers they have more time to create amazing experiences on the Web.' Curiously, however, the video embedded in the page works only in some browsers. Dear Microsoft, IE9 supports many royalty-free, web-compatible formats out of the box (HTML, CSS, WOFF, PNG, and the like) so why not at least one more?"