I think there is a subtle problem with the section on event-handlers being pulled out of the html tags. It uses a GetElementByID example, which should only have one element per page (because it's an ID, not a Class), but then mentions the advantages of using the recommended procedure because it will let the programmer avoid having to update lots of elements on the page. I would suggest either using GetElementByClass as the example instead.
His W3C DOM Compatibility Tables, especially, have saved web developers from over the world an estimated GBP 5 million on hair implants and hair care products.
Browser vendors such as Microsoft, Opera, and Apple use these tables to solve bugs in their products.