WCAG 2.1 AA checks
6 min readLast updated 2026-04-27New
The specific WCAG 2.1 AA rules that Check Studio validates automatically.
Check Studio runs 42 automated WCAG 2.1 AA checks using axe-core. Here are the most impactful rules and how they are validated.
Color and contrast
- color-contrast: Text must have 4.5:1 contrast against background
- link-in-text-block: Links must be distinguishable from surrounding text
Navigation and focus
- bypass: Page must have a skip link or landmark
- focus-order: Tab order must follow visual layout
- no-focus-traps: Focus must not be trapped in any element
Form labels
- label: Every form input must have a label
- aria-required-attr: Required ARIA attributes must be present
- aria-roles: ARIA roles must be valid
Manual checks
Automated checks cover ~30% of WCAG 2.1 AA. Manual testing with screen readers is still required for full compliance.
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