web Accessibility


alt tags or alternate text:

Assigned text to an image describing the content of an image. Disabled users are able to comprehend images they cannot see with alt tags read when using screen readers. Sighted users can view alternate text when it appears as pop-up text when a user moves the mouse over an image.


A characteristic or setting used in coding HTML. Assigning structure, color, font, and parameters are a few examples of its functionality.


Functionality that exists on the user's machine rather than handled by the server.

CSS absolute positioning:

Taking an element out of the flow of your HTML document and positioning it relative to the top-left corner of your page.

CSS style sheets:

CSS, or cascading style sheets, allow you to define how Web page elements are displayed. For example, specific colors, fonts, margins, and sizes can be associated with headers, body text, and links. When style sheets are applied to a new page, the elements are changed according to the specifications of the style dictated.


A region in a browser window that can display an HTML document (not a file) independent of what is being displayed in the rest of the browser window. A frame may be scrollable, and resizable, and have a border. You can display a page in a frame by creating a hyperlink to the page and specifying the frame as part of the hyperlink.


Distinguishes the column and row titles from the column and row data in a table.

hot area:

On a server-side image panel, the area containing a rectangle, object, or text that the user can click to view another panel containing related information.

hot spots:

On a client-side image map, the portions of a picture or graphic containing embedded links. You can identify hot spots by mousing over client-side image maps and seeing your cursor change into a pointing hand.


JavaScript can be thought of as an extension to HTML allowing authors to incorporate some functionality in their web pages.

longdesc or long description:

Detailed text assigned to an image describing the content of the image. Disabled users are able to comprehend images they cannot see with longdesc tags read when using screen readers. Long descriptions provide more detailed information using an additional HTML page.


HTML code added to format the text of a document. For example, you can label headings properly using <h1> name of heading </h1> to make information available for people using screen readers.

screen reader:

Voice output technology producing synthesized voice output for text and images displayed on the computer screen, as well as for keystrokes entered on the keyboard.


A computer in a network that is used to provide services to other computers in the network. Examples of services are access to files and routing of e-mail.


Functionality that is provided by a server rather than a user's machine. With server-side image maps, mouse coordinates are sent to a server, which then decides what action to take.


A convenient way to control the layout of text and images on a web page. Tables can be used to show data and/or images in columns and rows.


Commands written into a document specifying how it should be formatted. For example, in HTML, a boldface tag is represented as <b>text</b> replacing "text" with the words you want.