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HTML is used to create and design static web pages. It proved to be very useful and easy to understand and soon after its evolution it gained world wide popularity rapidly. But with the growth of internet and its related applications the internet users demanded something more in the websites. Web surfers were vigorously expecting more interactive, entertaining and exciting web content. Thus DHTML was introduced. Some people call DHTML as an advanced version of HTML, but some did not consider it a language or a new specification of HTML. Rather, they perceive DHTML as a new way of controlling the HTML commands and functions. DHTML is basically an amalgamation of four different techniques i.e. HTML, Scripting, Cascading Style Sheets (CSS) and Document Object Model (DOM). Using all these tools we can create more interactive and animated web pages to arrest the attention of the internet users. DHTML is used to insert special effects to a website such as mouse rollover effects, drop down lists, animations, advanced marquee effects etc. It allows you to control the HTML elements and change them.

The four techniques which are harmonically used in DHTML are:

1) HTML: DHTML uses the standard HTML code as its base.
2) Scripting: A client side scripting language such as Java Script is used to control the elements in DHTML
3) CSS: Cascading Style Sheets are also used to define and manage the style and layout of the web pages.
4) DOM: Document Object Model allows you to access any portion of a DHTML document and change its properties.

DHTML adds life to static HTML pages. The user feels that he is interacting with the website in real time. DHTML can add an effect with any event. For example when you click on an image, it background changes. In this the effect is related with the mouse click event. Similarly a lot of events such as mouse rollover, drag n drop, scroll etc. can be associated with one or more DHTML effects.

The four properties of DHTML are:

1) DHTML is used to modify and control the standard HTML tags and their attributes.
2) DHTML gives you real time interactivity with the web page. It can position different objects, images and text dynamically within the web page.
3) DHTML is also used dynamic fonts. Only Netscape Navigator supports this function.
4) Another important feature of DHTML is Data Binding. With the help of this property the web surfer can easily access databases from the websites. This feature is only supported by Microsoft’s Internet Explorer.

It is clear from the above discussion that DHTML has many advantages and some disadvantages too. DHTML is more complex than HTML. The DHTML editors are very costly. Apart from this some of the features of DHTML are browser specific but still DHTML is used worldwide as it has proved itself a great utility to enhance the quality and usability of web pages. Anyone can use DHTML in any form. From a small piece of creativity to large complex codes, DHTML can be used to make web sites better than ever before.