On April 12 , Microsoft made available a developer preview of IE 10. It is available on the IE Test Drive site . Microsoft officials said to expect the company to offer new builds every 12 weeks . (With IE 9 , it was every eight weeks.) IE 10 will build on the HTML5 and accelerated hardware graphics capabilities that Microsoft built into IE 9. It also will include support for additional standards, like CSS3 Gradients on background images and CSS3 Flexible Box Layout, officials said. IE 10 is expected by many Microsoft watchers to be the IE build that Microsoft will include in Windows 8 when it ships, most likely in 2012. It took Microsoft about a year to move from the first developer preview to the final release-to-Web build of IE 9.