As usual, Google Chrome, Opera, and Apple Safari all pass the Acid3 test with the maximum score of 100. Mozilla Firefox 4 raises the browser's score from 94 to 97, and IE9 still scores a 95. CSS3 Selectors Test
Once again, every browser except Chrome earns the maximum score of 574 in the CSS3 Selectors Test; Google's browser scores 558. HTML5Test.com
Chrome again steals the show in HTML5 compliance, earning a score of 288 and 13 bonus points. With version 4, Firefox manages to climb from fourth place up to second, leap-frogging third-place finisher Opera, and sending Safari into fourth. Despite how well IE9 implements HTML5 hardware acceleration, it still finishes last in compliance of the upcoming standard.