What the check looks for
- captions or a transcript for narrated slides, synced captions for video and a transcript for audio;
- alt text on images, or a decorative mark;
- labels on shapes, icons, inputs, tabs and buttons, and titles on embeds;
- keyboard equivalents for pointer-only triggers, focus order, and hover or focus layers;
- text contrast of 4.5:1, and 3:1 for large text, controls and focus rings;
- empty or skipped headings.
Blockers and warnings
Each finding names where it is and why. Blockers stop a production export until they are fixed. Warnings tell you what to review.
What checks cannot do
Checks catch common, detectable problems. They do not make a course WCAG compliant on their own. Some items, such as autoplay, stay on a manual checklist. Test with real users and assistive technology.