1.1.1 Non-text Content
Images should have descriptive (alt) text.
1.2.1 Audio-only and Video-only (Pre-recorded)
Any audio-only content should also be conveyed in text. Any video content with no audio track should also be described in text, but could also be described with audio.
1.2.2 Captions (Pre-recorded)
The audio in videos should be captioned.
1.2.3 Audio Description or Media Alternative (Pre-recorded)
Actions, descriptions, and other important non-audio content in videos should be described in captions, a separate audio track, or a text-based alternative like a screenplay.
2.4.4 Link Purpose (In Context)
A link’s destination should be clear from either the link text itself or the surrounding sentence context.
2.5.2 Pointer Cancellation
Actions (like pressing a button) aren’t triggered on mouse-down; rather on mouse-up.
2.5.4 Motion Actuation
There is no reliance on device motion, like shaking or tilting, to carry out an action.
3.1.1 Language of Page
There’s a lang attribute on the element that matches the language of the page.
3.3.7 Redundant Entry
Users should not have to re-enter previously provided information unless necessary.
