<code>td</code> is a special element that defined in <code>wrapMap</code>, in <code>jQuery.clean</code>/<code>jQuery.buildFragment</code> it should descend to the right depth, parent would not be <code>div</code> like with most nodes, but <code>tr</code> element, so <code>td</code> should be removed though it. 

I wanted to test that...