DHTML stands for Dynamic Hyper Text Markup Language (usually referred to as Dynamic HTML). DHTML is a client-side scripting language and it is a very powerful tool that allows web builders do wonders with their web sites. DHTML is also made up of various technologies such as CSS, HTML, JavaScript, and the Document Object Model (DOM).
unfortunately though, DHTML is not used widely for one important reason - not all browsers support it (3.0 browsers for example). since there are still a lot of people using 3.0 browsers, web developers and designers have no choice but to refrain from using this fluent and interestingly dynamic Markup Language.
for further information on DHTML,
visit: www.w3schools.com/dhtml