Actual (live) results in your browser:

This text should flow around the floated block, on its right side and below. This text should flow around the floated block, on its right side and below.

Expected results (screen shot):

Reference:
non-positioned block boxes created before and after the float box flow vertically as if the float did not exist
coming from CSS 2.1, section 9.5 Floats

Firefox 2.0.0.3, Firefox 3, Opera 9.20, Safari 2.0.4, Safari 3.0.2, Konqueror 3.5.5, Seamonkey 1.x, NS 6.1, NS 6.2, NS 7.0, NS 7.1, NS 7.2, Epiphany 2.14 all pass this test.

Credit must go to Lutz-Peter Hooge for creating a similar testcase.