XRAY :: for web developers
This looks handy, especially since it works in Safari (‘cause I’m not using Firefox if I can help it.)
bq. “XRAY”:http://westciv.com/xray/index.html is a bookmarklet for Internet Explorer 6+, and Webkit and Mozilla based browsers (including Safari, Firefox, Camino or Mozilla). Use it to see the box model for any element on any web page.