The W3C DOM and JavaScript - JavaScript by Example - page 621

Figure 15.7 The node properties.

15.5 DOM Inspectors

A DOM inspector is a browser tool that lets you dynamically traverse the DOM tree and
check CSS styles, in a two-paned window as shown in Figure 15.8. Now you can view
the markup in your Web page and all the nodes and their types for those parts of the
page that are of interest to you.

For Firefox: see https://developer.mozilla.org/en/dom_inspector.
For Internet Explorer see: http://www.ieinspector.com/dominspector/.
For Opera go to the menu: Tools

→ Advanced → Developer Tools.