This is the master bug for WebKit not passing Acid3.
The test can be found at http://www.hixie.ch/tests/evil/acid/003/
Correct rendering is at http://www.hixie.ch/tests/evil/acid/003/reference.html
Is this for real? The test seems to be deliberately obscured if you browser to the parent directory.
This test isn't even remotely ready yet.
IMHO this bug should be marked as INVALID.