Multimedia contents such as video, images, and sounds give flexibility presentation of learning material. For making sure multimedia contents accessible, they should be occupied with caption, audio description or alternative text (W3C,2008). Video captioning is creating text version of the spoken word in the video.

There are two type of video captioning which are open caption that is permanently embedded to the video, and closed caption that is can be set on/off by teachers or students. Audio description is information that allow student with visual impairment hear the visual content (Web Accessibility in Mind, n.d). Sometimes the video caption and audio description are made in two tiers for different cognitive ability like in the eLearner system (Sapp, 2009). Accessible images can be made by adding alternative text or alt-text for describing the content and function, instead of image appearance Web Accessibility in Mind (2009).

Sapp, W. (2009). Universal Design: Online Educational Media for Students with Disabilities. Journal of Visual Impairment & Blindness, 103(8), 495-500.Retrieved from http://ezproxy.lib.monash.edu.au/login?url=http://proquest.umi.com/pqdweb?did=1862973271&Fmt=7&clientId=16397&RQT=309&VName=PQD

W3C. (2008). Web Content Accessibility Guidelines (WCAG) 2.0. Retrieved 16 March, 2010, from http://www.w3.org/TR/2008/REC-WCAG20-20081211/.

Web Accessibility in Mind (n.d). Web Captioning Overview. Retrieved 12 April, 2010, from http://www.webaim.org/techniques/captions/.

Web Accessibility in Mind (2009). Quick Reference: Web Accessibility Principles. Retrieved 8 April, 2010, from http://www.webaim.org/resources/quickref/quickref.pdf