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WCAG 1.4.12 Text Spacing & Flow Validator

Verify typography adaptability with WCAG 2.1 SC 1.4.12 line, paragraph, and letter spacing rules

Spacing Controls

Line Height (Min 1.5x)1.50x ✓
Paragraph Margin (Min 2.0x)2.00x ✓
Letter Spacing (Min 0.12x)0.12em ✓
Word Spacing (Min 0.16x)0.16em ✓

Live Spacing & Layout Preview

Verify that text does not truncate, overlap, or clip when user spacing is applied.
WCAG 1.4.12 Compliant

Success Criterion 1.4.12 requires that in content implemented using markup languages that support style property adjustments, no loss of content or functionality occurs when users override default text spacing properties.

People with low vision or reading disabilities such as dyslexia often read faster and with higher comprehension when line, letter, and word spacing can be increased. Web authors must build flexible card containers and buttons that do not fix vertical heights rigidly.

Test your UI components by pasting the generated bookmarklet into your browser console or bookmarks toolbar to audit live production layouts instantly.

About WCAG 1.4.12 Text Spacing & Flow Validator

Test container layout resilience under user-defined text spacing adjustments. Includes live interactive spacing controls, compliance verifiers, and one-click JavaScript bookmarklets.

Key Capabilities & Features

  • Evaluates all 4 WCAG 1.4.12 criteria (line-height, paragraph, letter, word)
  • One-click "Force WCAG Spacing" toggle
  • Live paragraph layout flow simulator
  • Copyable CSS !important overrides snippet
  • JavaScript bookmarklet for live production testing

How to Use WCAG 1.4.12 Text Spacing & Flow Validator

1

Adjust Spacing

Use the sliders to modify line height, paragraph margin, and tracking.

2

Check Compliance

Ensure values meet or exceed 1.5x line height and 2.0x paragraph margin.

3

Test Your Site

Copy the bookmarklet into your browser to test live production pages.

Privacy & In-Browser Execution Guarantee

Calculations run 100% in your browser. Zero tracking.

Frequently Asked Questions

What are the 4 WCAG 1.4.12 text spacing thresholds?

Line height to at least 1.5 times the font size; spacing below paragraphs to at least 2 times font size; letter spacing to at least 0.12 times font size; word spacing to at least 0.16 times font size.

Why do users adjust text spacing?

People with low vision or cognitive reading disabilities like dyslexia frequently increase text spacing to significantly boost reading comprehension and speed.

What causes text spacing failures in web development?

Fixed CSS heights (e.g. height: 40px) or overflow: hidden on text containers, which causes text to clip, overlap, or truncate when user spacing styles are applied.

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