Readie - 11:11 pm on Mar 24, 2010 (gmt 0)
I do run my sites through the validator, but that doesn't stop some display errors creeping through in some browsers (à-la annoying little 1px off errors).
I hadn't even heard of these before :/
Mac IE 5 and Mac NN 4.
That's quite worrying for me - I use this for low-height cells sometimes:
The ones you really have to worry about are ones that rely on font availability and font sizing to "work."
<td class="something"><span style="font-size: 1px;"> </span></td>