Unfortunately, the two leading browsers -- Netscape Navigator and Microsoft Internet Explorer -- use different DOMs. This is one reason why their respective implementations of DHTML are so different. Both companies have submitted their DOMs to the World Wide Web Consortium (W3C) for standardization, which now has the daunting task of specifying a standard DOM without alienating either of the browser giants. The W3C's DOM specification will support both HTML and XML.

Document Object Model FAQ
W3C page containing the most frequently asked questions about the Document Object Model.

Document Object Model Specification
The W3C's current working draft of the DOM specification.

W3C's DOM site
Home page for the World Wide Consortium's (W3C) Document Object Model (DOM) activities. Contains links to the DOM specification, FAQs, and related resources.