Just hours ago Microsoft released an amazing new resource that helps the entire frontend engineering industry. Their Windows Internet Explorer Testing Center contains thousands of test cases covering CSS 2.1, HTML5, and WAI-ARIA.
CSS gets the most coverage with 7005 tests, 3784 of them developed just since IE8’s “beta 2″ a few months ago. IE8 passes all 7005, including, mysteriously, 52 tests that do not pass on any other major browser.
For HTML5, coverage includes 13 cross-document messaging and 30 DOM Storage tests. For WAI – ARIA they submitted new samples to support their previously-submitted ARIA to MSAA roles, events, and mappings.
While a great resource for the standardization movement in general, it also goes a long way to support their stated belief that “IE8 RC1 has the most complete implementation of the CSS 2.1 specification in the industry.” It will be very interesting to see if any of the other browsers care to comment. I’m hoping for a four-way tie.