theme: Zoom and Legibility
How text and layouts respond to zoom and visual customization.
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.
1.4.8 Visual Presentation
For blocks of text, justification must be avoided, line-height must be at least 1.5, width must not exceed 80 characters, and users must be able to set text and background colors.
1.4.9 Images of Text (No Exception)
Text is actual text; never images of text.
1.4.10 Reflow
Content must remain readable and usable without requiring horizontal scrolling when viewed at a width of 320 CSS pixels (typically the width of a mobile viewport). Layouts should adapt responsively, and text should reflow to fit the screen.
1.4.12 Text Spacing
Users can increase letter, word, line, and paragraph spacing without cutting off content or breaking functionality.
1.4.13 Content on Hover or Focus
Tooltips and similar content should stay visible, be easy to dismiss (usually with the Esc key), and let users select and interact with the text.
