WCAG in Plain English

Text contrast against its background must be at least 4.5:1 for normal text, or 3:1 for large text (over 24px, or bold and over 19px).

Text remains readable and usable when zoomed to 200%.

Text must be actual text, not images of text, unless a specific visual presentation is absolutely necessary (e.g. logo).

Text contrast against its background must be at least 7:1 for normal text, or 4.5:1 for large text (over 24px, or bold and over 19px).

Blocks of text (like paragraphs) must have a line height of at least 1.5, not be justified, and stay within 80 characters (or 40 for CJK scripts). Allow users to adjust spacing and colors using custom styles.

Text must be actual text, not images of text (no exception, not even for design or aesthetic reasons).

Content remains functional and easy to read when; zoomed to 400% or; viewed at 320px width, without needing to scroll in two directions (except for tables, maps, and similar content).

Text remains readable and usable when spacing is changed using custom styles to at least 1.5× line height, 2× spacing after paragraphs, 0.12× letter spacing, 0.16× word spacing, without content being hidden, cut off, or broken.

When additional content appears on hover or keyboard focus (including long press on touch), it must stay visible until dismissed or no longer valid, be dismissible (e.g. using the key), and remain visible when hovered or focused.