[Google to use HTML5 in Gmail](http://www.computerworld.com/s/article/9178558/Google_to_use_HTML5_in_Gmail) (emphasis added):
> Google’s current goal is to get Gmail to load in under a second. “Speed is a feature,” he said.
> Early tests have proved promising. For instance, Gmail looks for those browsers that can work with version 3 of the Cascading Style Sheets (CSS), a standard closely related to HTML5. __If the browser supports CSS3, Gmail will render the pages using these specifications, rather than its traditional approach of using the Document Object Model (DOM).__ The company has found that using CSS3 can speed the rendering time by 12 percent.
Glad to be finally get rid of that [DOM](http://en.wikipedia.org/wiki/Document_Object_Model).