Is there an easy way to figure out which CSS tags are/are not ok to use? My main question, is it ok to set the background image of a Table cell (TD) using CSS?

Something like this:

td {
background-position:top left;

PS. This is my first question on sitepoint, please just repond with the word Google, if this is child's play. I could search da net myself, but the whole reason I'm here in the first place is cause of searching. Usually I'll search for something and like 2 or 3 hours later I'll find myself reading what Carlo Fakelastname did for the last few months, or what Jane Doe's favorite movies are....etc.