All tests should succeed.
Test 1 fails, while tests 2, 3 and 4 succeed, in the following browsers:
Macintosh Safari 4.0 beta (Webkit 528.16.1)
Macintosh Safari 3.2.1 (Webkit 525.27.1)
Macintosh Safari 3.1.2 (Webkit 525.18)
Windows Chrome 1.0.154.43 (Webkit 525.19)
All four tests succeed in Firefox, IE 7, Opera and Konqueror.
All four tests succeed in Safari 1.3.2 (Webkit 312.9)
https://bugs.webkit.org/show_bug.cgi?id=23581