principle: Perceivable
Make sure that everyone can perceive or detect the same content and components. Can people perceive this content with whatever capacity they have?
1.4.13 Content on Hover or Focus
Tooltips can be dismissed, usually via the esc key, the text in the tooltip can be selected, and they don’t time out on their own.
1.4.2 Audio Control
Auto playing audio that lasts more than 3 seconds can be turned down or stopped.
1.4.3 Contrast (Minimum)
Text has a contrast ratio of 4.5 to 1. Large text can be a 3 to 1 ratio if it’s over 24px, or bold and over 19px.
1.4.4 Resize Text
Text can be resized up to 200% without loss of content or functionality, except for captions and images of text.
1.4.5 Images of Text
Text is actual text; not images of text.
1.4.6 Contrast (Enhanced)
Text has a contrast ratio of 7:1 to 1. Large text can be a 4.5 to 1 ratio if it’s over 24px, or bold and over 19px.
1.4.7 Low or No Background Audio
For spoken audio content, any background noise or music is 20 decibels lower than the foreground speech.
1.4.8 Visual Presentation
For blocks of text, justification should be avoided, line-height should be at least 1.5, width should not exceed 80 characters, and users should be able to set text and background colors.
1.4.9 Images of Text (No Exception)
Text is actual text; never images of text.
