User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:11.0) Gecko/20100101 Firefox/11.0 Build ID: 20120312181643 Steps to reproduce: I created some simple HTML with 2 columns and 1 row spanning 3 rows. http://jsfiddle.net/Qz9H3/12/ Actual results: The borders aren't rendered properly (or as expected) - Safari displays them properly, chrome does too, but with a different issue. http://jsfiddle.net/Qz9H3/12/ Expected results: http://jsfiddle.net/Qz9H3/12/ The borders should stay around the defined TD and not span other columns, when HTML did describe it as such