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WebAim Tutorial: Describes how to use headings, add alt text, create links, and use Word’s Accessibility Checker to identify accessibility problems. It also explains how to convert Word to HTML.
Creating Accessible PowerPoint Presentations
Microsoft PowerPoint Accessibility Guidelines: Provides best practices for creating accessible PowerPoints (Windows, Mac, iOS, Android, and online). It also provides instruction on how to alt text for graphic, hyperlinks, and accessible design tips.