We currently fail four reftests in layout/floats/ that Microsoft says they've fixed and haven't gotten compatibility problems as a result of fixing. So after Firefox 4 we should try fixing them. They're layout/reftests/floats/...: other-float-outside-rule-3-left-2.html other-float-outside-rule-3-right-2.html other-float-outside-rule-7-left.html other-float-outside-rule-7-right.html and in the CSS 2.1 test suite they are: http://test.csswg.org/suites/css2.1/20101027/html4/floats-rule3-outside-left-002.htm http://test.csswg.org/suites/css2.1/20101027/xhtml1/floats-rule3-outside-left-002.xht http://test.csswg.org/suites/css2.1/20101027/html4/floats-rule3-outside-right-002.htm http://test.csswg.org/suites/css2.1/20101027/xhtml1/floats-rule3-outside-right-002.xht http://test.csswg.org/suites/css2.1/20101027/html4/floats-rule7-outside-left-001.htm http://test.csswg.org/suites/css2.1/20101027/xhtml1/floats-rule7-outside-left-001.xht http://test.csswg.org/suites/css2.1/20101027/html4/floats-rule7-outside-right-001.htm http://test.csswg.org/suites/css2.1/20101027/xhtml1/floats-rule7-outside-right-001.xht This is related to the issue previously reported as: http://lists.w3.org/Archives/Public/www-style/2009Jan/0445.html http://wiki.csswg.org/spec/css2.1#issue-101
It looks to me like IE fixed rule 3 but not rule 7... though the IE I'm testing isn't the latest.
Also, the tests in http://dbaron.org/css/test/2009/float-outside-tests/ are easier to check visually.
(And IE fixed rule 5. And they fixed the BFC displacement for one side but not the other!)
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