Practical rules for color contrast, minimum font sizes, letter spacing limits, and screen reader compatibility.
WCAG AA Contrast Requirements
- Normal text (below 18pt or 14pt bold): minimum contrast ratio of **4.5:1** against background.
- Large text (18pt / 24px and above, or 14pt / 18.5px bold): minimum contrast ratio of **3.0:1**.
Avoid Justified Text on the Web
Fully justified text creates inconsistent gaps and 'rivers of white space' that cause severe reading difficulties for individuals with dyslexia. Stick to left-aligned (ragged right) text for western languages.