Anyone serious about working on their own website should install Chris Pederick's Web Developer browser extension, (and I suggest using it with FireFox).
The toolbar adds all kinds of diagnostic tools for debugging CSS, HTML, DOM, images and more. In-fact, it has so many features, many developers forget what is buried deep inside the toolbar's pull-down menus.
Lets say you wanted to outline all the TABLE CELLS on a page. You could [READ MORE...]