Accommodation addresses requests made by individuals. For example, extended test-taking time. 

Accessibility, aka inclusive design, aka universal design is: “the design of products and environments to be usable by all people, to the greatest extent possible, without the need for adaptation or specialized design.” If a course employs universal design principles, most accommodation needs are met. 

Read more on the DO-IT (Disabilities, Opportunities, Internetworking, and Technology) website, Universal Design vs. Accommodation

Programmatically determined text that is used in place of non-text content, or text that is used in addition to non-text content and referred to from the programmatically determined text.

Version that provides all of the same information and functionality and is as up to date as any non-conformant content.

External devices that are designed, made, or adapted to assist a person to perform a particular task.

Narration added to the soundtrack to describe important visual details that cannot be understood from the main soundtrack alone.

Note 1: Audio descriptions of video provide information about actions, characters, scene changes, and onscreen text.

Note 2: In standard audio description, narration is added during existing pauses in dialogue. (See also extended audio descriptions)

Text presented and synchronized with multimedia to provide not only the speech, but also sound effects and sometimes speaker identification.

Note: In some countries, the term “subtitle” is used to refer to dialogue only and “captions” is used as the term for dialogue plus sounds and speaker identification. In other countries, subtitle (or its translation) is used to refer to both.

In regard to accessibility, the difference between the foreground text color and background color must be sufficient for those with visual impairments to read it. Often referred to as the “contrast ratio.”

Document including correctly sequenced descriptions of all visual settings, actions, and non-speech sounds combined with descriptive transcripts of all dialogue and a means of achieving any outcomes that are achieved using interaction during the multimedia.

Note: A screenplay used to create the multimedia content would meet this definition only if it was corrected to accurately represent the final multimedia after editing.

For keyboard and assistive technology users, the tab order through content, including interactive elements (form fields and links), determines the order in which these users can navigate the content. The tab order must reflect the logical order of the document. The tab order is the order in which objects receive input focus when users press the Tab key. 

The technology of moving pictures or images (i.e., narrated PowerPoint presentations are not video).

Note: Video can be made up of animated or photographic images, or both.

For those who rely on the keyboard and do not use a mouse, tabbing through the page elements should follow a logical order and and be visible. Elements can be highlighted or have a border that moves as you tab through the webpage.

The international standards for web accessibility developed by the W3C (World Wide Web Consortium). Current version is WCAG 2.1.