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Web Development Terms and Acronyms

What is a browser ?
A software application used to locate and display Web pages such as Internet Explorer or Firefox.
What is CSS?
CSS (Cascading Style Sheets) is a web standard for controlling the layout and appearance of a web page. Style sheets can be updated quickly, allowing changes to fonts, colors, margins, positioning, etc. by updating just one small text file. They can also be used to control how your page prints out. For instance, your navigation will not waste your customer's paper by printing your navigation. You may also choose to have your contact information automatically appear.
What is a DNS?
DNS (Domain Name System/Service) is an internet system/service that translates domain names like into Internet Protocol IP addresses. Every time you use a domain name, therefore, a DNS service must translate the name into the corresponding (IP address).'s IP address is You will probably only need to know this term if you are changing your web hosting.
What is a Favicon?
A favicon is a small graphic that is associated with a page or web site. The favicon allows the web developer to customize the site in the web browser, both in the tab bar that is displayed in many browsers as well as in the bookmarks when a site is saved.
How big is a Megbyte (MB)?
The basic unit used in computer data storage is called a bit (binary digit). Eight bits are a byte. A Kilobyte is about 1,000 bytes and a Megabyte is about 1,000 Kilobytes. (For example the logo on our home page is about 8 KB and a high-quality JPEG photo from a 6.3 megapixel digital camera is about 3MB.)
What is PHP?
PHP (PHP Hypertext Preprocessor) is a scripting language developed allowing web developers to write pages quickly. For instance, updating site navigation or contact information or adding random quotes. We use it for the Diablo Canyon Independent Safety Committee web site beause they have over 500 pages and their navigation changes frequently.
What is a URL?
URL (Universal Resource Locator) is the unique address of any web document, also known as a web address. The URL you are viewing now is “”.
What is WAI/Accessibility on the internet?
The Web Accessibility Initiative (WAI) is a set of standards developed bo help web designers and developers create sites that better meet the needs of people with disabilities, including blindness and low vision, deafness and hearing loss, learning disabilities, cognitive limitations, limited movement, speech disabilities, photosensitivity and combinations of these.
What is XHTML?
XHTML (Extensible Hypertext Markup Language) is the modern language used for displaying web pages. It is read by the web browser, which then structures the page layout. XHTML is more powerful than last century's HTML because it supports a wider range of tags and needs to be more rigorously defined and handled. XHTML allows your customers to access your web site from almost any internet device.

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