While a separate Web performance group within W3C does look at performance, the purpose of the HTML5 test suite is to help vendors and developers ensure that HTML5 applications work across all browsers. For example, a developer might check the test results before enabling a certain feature in an application, just to make sure it will work across IE9, Firefox, Chrome, Safari and Opera.
Developers can build HTML5 applications today, but they have to keep in mind that they are early adopters and act accordingly, Le Hegaret says.
"If you think HTML5 is perfectly stable today and you can use it without worrying about interoperability issues, I think you're going to fool yourself," he says.
Although the first round of HTML5 tests focused on desktop browsers, Le Hegaret says HTML5 compatibility is advancing more rapidly on mobile devices such as iPhones and Androids.
"We are in better shape on the mobile platform than we are on the desktop platform," he says. "The mobile market is upgrading more rapidly than the desktop market. But the desktop PC is catching up pretty rapidly."
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