On the Web, accessibility means that any person, including someone with disabilities, can obtain the information they need from the pages in your site. Anything that prevents a person from obtaining needed information makes that content inaccessible.
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Modified from "Principles of Accessible Design." Introduction to Web Accessibility (webAIM)
Captions can be requested from a video page in the Captions can be requested from a video page in the Libraries Media Space. Click the “Actions” button and select “+Order Captions”.