Webkit had to request changes to the tests in in Acid2. The Wikipedia page mentions that Acid3 was also updated to match Firefox's change in behavior: "On 2 A

Webkit had to request changes to the tests in in Acid2. The Wikipedia page mentions that Acid3 was also updated to match Firefox's change in behavior: "On 2 April 2010, Ian Hickson made minor changes to the test after Mozilla, due to privacy concerns, altered the way Gecko handles the :visited pseudo-class." http://en.wikipedia.org/wiki/Acid3#Development_and_impact http://en.wikipedia.org/wiki/Acid3#Development_and_impact