Whenever an image (i.e., a diagram, animation, photo, icon, etc.) is presented on a webpage, and is not purely decorative, the information that the image conveys should also be provided as a text alternative. Text alternatives are especially important when the image is being used for website navigation, controls, or as a visual cue. Another situation in which text alternatives must be provided is when an image or media is being used in the context of an assessment (e.g., tests or quizzes). In this case, the text description should be as descriptive as possible without giving away any of the answers. When including charts or diagrams on a webpage, it is important to consider both the colour contrast ratio and the size of text. These considerations, combined with the inclusion of text alternatives, will ensure that the information that charts and diagrams provide is available to all users.

CEL Accessibility Guidance (derived from WCAG 2.0) Addressing the Use of Images:

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  • Key Terms

    1. Must means do things in the manner described exactly.
    2. Should means do things in the manner described unless there is a good reason not to [i.e., instructor has other needs].
    3. [Supplementary information] is provided in square brackets.