Parts of DHTML?

There are 4 parts of DHTML
Document Object Model (DOM) (definition): The DOM is what allows you to access any part of your Web page to change it with DHTML.
Scripts: scripts written in either JavaScript or ActiveX are the two most common scripting languages used to activate DHTML.
Cascading Style Sheets (CSS): CSS is used in DHTML to control the look and feel of the Web page
XHTML: XHTML or HTML 4.x is used to create the page itself and build the elements for the CSS and the DOM to work on. There is nothing special about XHTML for DHTML - but having valid XHTML is even more important