For AI agents and LLMs: a machine-readable index is available at llms.txt. A plain-Markdown version of any documentation page is available by appending .md to its URL.
Skip to main content

Text Spacing (1.4.12)

Content must remain readable and functional when users override text spacing properties (line height, paragraph spacing, letter spacing, and word spacing) up to specified thresholds.

WCAG Reference

Applies to: WCAG 2.1, WCAG 2.2 Introduced in: WCAG 2.1 | Level: AA | Read the official specification →

What this rule checks​

The scanner tests whether content is clipped, truncated, or overlapping when text spacing is increased to WCAG-specified thresholds: line height 1.5x font size, paragraph spacing 2x font size, letter spacing 0.12x font size, word spacing 0.16x font size.

Why it matters​

Users with dyslexia and other reading disabilities use custom text spacing to improve readability. If a page clips or overlaps text when spacing is increased, those users lose access to the content.

Common failure patterns​

  • fixed-height containers that clip text when line height increases
  • overflow: hidden on text containers that truncates content with increased spacing
  • absolutely positioned labels that overlap adjacent content when letter spacing grows
  • tooltip or badge text that overflows its container

Remediation guidance​

  • avoid fixed heights on text containers; use min-height or auto-height
  • do not use overflow: hidden on elements that contain user-facing text
  • test with a text-spacing bookmarklet that applies the WCAG thresholds
  • ensure layouts flex and reflow when text occupies more space
Last updated on

Terminal First Testing With Kane CLI

Natural language browser & mobile app tests right from terminal.

×
Schedule Your Personal Demo
Kane CLI terminal

Help and Support

Related Articles