One of my coworkers asked me the other day about whether absolutely positioned elements can be placed over form elements. I recalled back to yesteryear when that certainly was an issue, though I wasn’t sure if that still affected browsers today. (Most commonly, the issue would come up with dynamic menus which form elements could sometimes peek through.)
After some Googling, I came up with this page at the DHTML Lab (aka WebReference) which addresses the issue...