It shouldn’t come as a surprise that Internet Explorer 9 has topped W3C’s first official HTML5 conformance tests. While HTML5 is still a developing standard, Microsoft’s commitment to standards is commendable. With IE9, Microsoft has been talking a lot about HTML5, CSS3 and their dedication to make IE9 standard complaint. The tests go on to prove that it wasn’t just PR talk. They meant it. IE9 has been scoring well on the ACID3 tests as well.
The test results can be found on W3C and one should keep in mind that the results reflect only parts of the HTML5 standard and not all of it. IE9 platform preview is followed by Chrome 7 beta and Firefox 4 Beta. The scores:
Source: The Register