- April 13, 2005: Acid2 test announced by WaSP.
- April 27, 2005: Internal builds of Safari pass it.
- May 22, 2005: Public beta of iCab passes (but no one else notices for a week).
- June 5, 2005: Development builds of Konqueror pass.
- October 31, 2005: Safari 2.0.2 becomes the first non-beta web browser to pass the Acid2 test.
- Update: November 29, 2005: Konqueror 3.5 is the second released browser to pass.
- Update: March 10, 2006: Development builds of Opera pass.
- Update: June 20, 2006: Opera 9 passes
- Update: December 9, 2006: Development builds of Firefox 3 pass
- Update: December 19, 2007: Development builds of Internet Explorer 8 pass
So who’s next? Well, Opera 9 beta 1 is very close—there’s a pair of red squares that should be black, but that’s it. Neither IE7 nor Firefox 1.5 will have much in the way of Acid2-related fixes, though the trunk builds of Firefox show improvement, so
2.0 has a chance (since 2.0 will use the same engine as 1.5).