- [Web Content Accessibility Guidelines (WCAG) 2.2](https://www.w3.org/TR/WCAG/)
- [The A11Y Project](https://www.a11yproject.com/)
- [MDN accessibility documentation](https://developer.mozilla.org/en-US/docs/Web/Accessibility)
-- [Tenon.io Accessibility Checker](https://tenon.io/)
- [Color Contrast Analyser (CCA)](https://www.tpgi.com/color-contrast-checker/)
- ["HTML Codesniffer" bookmarklet for identifying accessibility issues](https://github.com/squizlabs/HTML_CodeSniffer)
- [Microsoft Accessibility Insights](https://accessibilityinsights.io/)