• 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 (削除) 2.0 has a chance (削除ここまで) (追記) 3.0 might make it (追記ここまで) (追記) will pass (追記ここまで) (since 2.0 will use the same engine as 1.5).