Dynamic content is basically about modifying the content of an HTML document "on the fly". To see how dynamic content can work for you, enter your name in the text box below and click. 
Dynamic content allows us to change content on the fly.
Before the advent of the DOM, changing the information displayed on a Web page once it was loaded required a postback, or another round-trip to the server. Any customization of the current page content required that the page be sent back to the server, which spends additional time to process the request and deliver the response back to the client.
The only ways then to maintain some semblance of efficiency were to use:
- framesets, wherein one frame's content stays constant while another frame changes its content based on the user's activity on the initial page, or
- iframes ( inline frames ), wherein the author could control only which parts of the page need to be reloaded.
DHTML has changed all that. It offers authors the ability to add, replace, remove, show or hide the content of the HTML document before or after the document has loaded, and is particularly useful in cases where there really is no need for a postback.
In this section, we learn how to go about: