Multimedia Accessibility
Video without captioning is not accessible to people who are hearing impaired and, without video description, may not be accessible to the visually impaired. A transcript of the video’s dialogue can be prepared in order to support the hearing impaired; however, computer technology is currently available that allows for the creation of captions and video description in digital video.
Microsoft Powerpoint
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Powerpoint Accessibility Techniques by WebAIM [2] - Convert PowerPoint presentations into accessible HTML (an add-on to PowerPoint).
Video Captioning
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Overview [3]