Have you seen this browser behavior in IE9? Click on a link to an HTML5 page, and the document mode that was set to IE9 is automatically reset to IE7.The problematic result is that the new canvas element does not work – as well as other HTML 5 goodies. And even more puzzling part is that the page has the HTML 5 DTD. There’s a lot of detail to learn about document compatibility in IE 9.