Nice tool to see the Markup Elements on the Page..

XRAY — Visualize the elements of the DOM

clipped from ajaxian.com John Allsopp has developed XRAY, a bookmarklet that launches a tool to visualize the web page that you are on (a little like features in Firebug and Firefox). The look and feel is great, and the margin popups look like the new Safari/Webkit search functionality (mmm orange).