Firefox has an accessibility inspector: https://developer.mozilla.org/en-US/docs/Tools/Accessibility_inspector https://developer.mozilla.org/en-US/docs/Tools/Ac

Firefox has an accessibility inspector: https://developer.mozilla.org/en-US/docs/Tools/Accessibility_inspector https://developer.mozilla.org/en-US/docs/Tools/Accessibility... Google develops Lighthouse, which, although an extension, I believe includes some a11y checks: https://developers.google.com/web/tools/lighthouse/ https://developers.google.com/web/tools/lighthouse/ Similarly, Mozilla also promoted Webhint: https://webhint.io/ https://webhint.io/ (which is cross-browser) I'd also recommend Khan Academy's tota11y, which just works as a bookmarklet: https://khan.github.io/tota11y/ https://khan.github.io/tota11y/