Deprecated Code
Deprecated code is code that is no longer included in the language specifications. Generally this happens because it is replaced with more accessible or efficient alternatives.
DHTML
Stands for Dynamic HyperText Markup Language. DHTML fuses XHTML (or any other markup language), the DOM, JavaScript (or other scripts), and CSS (or other presentation definition languages) to create interactive web content.
Directory
A database edited manually by Humans. Sites are indexed by category making this feature the main difference to a Search Engine. Users can navigate through the categories to locate documents or information. Most directories offer searching options (which is similar to searching from a Search Engine) within its database.
Dither
In GIF and certain other image formats, there is a limited color palette used for each image. Because of this, not all colors in an image are presented. Dither is used to approximate these colors by combining pixels of different colors side by side.
DNS
Stands for Domain Name Service (alternately Domain Name System or Domain Name Server). Basically, it’s the thing that converts IP addresses into domain names. DNS servers are provided with the IP address of your web server when you assign your domain name to those servers. In turn, when someone types your domain name into their web browser, those DNS servers translate the domain name to the IP address and point the browser to the correct web server.
Doctype
The doctype declaration specifies which version of HTML is used in a document. It has a direct effect on whether your HTML will validate.
Dom, The
Stands for Document Object Model. It’s a language-indpendent, cross-platform convention for representing objects in XML, XHTML, and HTML documents. Rules for interacting with and programming the DOM are specified in the DOM API.
Domain Name
An unique name that identifies one or more IP addresses. Domain names are used in URLs' to identify particular Web sites. Every web site is located by its unique IP address.
Drop-Down Menu
A drop-down menu (also known as a pull-down menu) is a navigation menu that “drops down” when you click it with a mouse or roll the mouse over it.
Dropbox
Dropbox is the easiest way to store, sync, and, share files online. There’s no complicated interface to learn. Dropbox works seamlessly with your operating system and automatically makes sure your files are up-to-date.
DTD
Stands for Document Type Definition. DTD is one of several SGML and XML schema languages. It provides a list of the attributes, comments, elements, entities, and notes in a document along with their relationships to each other.
Dynamic IP Address
An IP address (assigned by an ISP to a client PC) that changes periodically.
