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DHTML is differentiated from [[Ajax (programming)|Ajax]] by the fact that a DHTML page is still request/reload-based. With DHTML, there may not be any interaction between the client and server after the page is loaded; all processing happens in JavaScript on the client side. By contrast, an Ajax page uses features of DHTML to initiate a request (or 'subrequest') to the server to perform additional actions. For example, if there are multiple tabs on a page, pure DHTML approach would load the contents of all tabs and then dynamically display only the one that is active, while AJAX could load each tab only when it is really needed.
== Uses ==
DHTML allows authors to add effects to their pages that are otherwise difficult to achieve, by changing the [[Document Object Model]] (DOM) and page style. The combination of HTML, CSS and JavaScript offers ways to:
* Animate text and images in their document.
* Embed a ticker or other dynamic display that automatically refreshes its content with the latest news, stock quotes, or other data.
* Use a form to capture user input, and then process, verify and respond to that data without having to send data back to the server.
* Include rollover buttons or drop-down menus.
A less common use is to create browser-based action games. Although a number of games were created using DHTML during the late 1990s and early 2000s,{{Citation needed|date=October 2008}} differences between browsers made this difficult: many techniques had to be implemented in code to enable the games to work on multiple platforms. Recently browsers have been converging towards [[web standards]], which has made the design of DHTML games more viable. Those games can be played on all major browsers and they can also be ported to [[KDE Plasma Workspaces|Plasma]] for [[KDE]], Widgets for [[macOS]] and Gadgets for [[Windows Vista]], which are based on DHTML code.
The term "DHTML" has fallen out of use in recent years as it was associated with practices and conventions that tended to not work well between various web browsers. DHTML may now be referred to as [[unobtrusive JavaScript]] coding (DOM Scripting), in an effort to place an emphasis on agreed-upon best practices while [[Progressive Enhancement|allowing similar effects in an accessible, standards-compliant way]].
DHTML support with extensive DOM access was introduced with [[Internet Explorer 4.0]]. Although there was a basic dynamic system with [[Netscape Navigator|Netscape Navigator 4.0]], not all HTML elements were represented in the DOM. When DHTML-style techniques became widespread, varying degrees of support among web browsers for the technologies involved made them difficult to develop and [[debug]]. Development became easier when [[Internet Explorer 5|Internet Explorer 5.0+]], [[Firefox|Mozilla Firefox]] 2.0+, and [[Opera (web browser)|Opera]] 7.0+ adopted a shared [[Document Object Model|DOM]] inherited from [[ECMAScript]].
More recently, [[JavaScript library|JavaScript libraries]] such as [[jQuery]] have abstracted away many of the day-to-day difficulties in cross-browser DOM manipulation.
== Structure of a web page ==
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