Alternative text or alt text provides a textual alternative to non-text content in web pages. Alt text should be added to all your images in your slides and your exercises (if applicable), as it is especially important for students who may have a visual impairment that prevents them from seeing your images or if a students' chosen browser is unable to display the image. Providing alternative text will ensure that all your content is available to all students.

See this article from WebAIM, which goes into detail on the importance of alternative text and its place in web accessibility.

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