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GitHub Accessibility Scanner

Definition

GitHub's open-source accessibility scanner, a browser-driven tool for automated accessibility checks whose behavior is extended through plugins. The alt-text plugin is one such plugin, adding image-alt-quality rules on top of the scanner's core checks. (Source: sources/2026-08-24-github-your-alt-text-passes-automated-checks-that-doesnt-mean-its-any-good)

Notes

• The scanner drives a real browser and exposes image findings through a normal reporting pipeline that carries the real page URL and original HTML — so findings are locatable and fixable.
• Some plugin findings can overlap the scanner's own built-in checks (e.g. the alt-text plugin's missing-alt rule covers the same ground as a core check).
• Automated checks are treated as a floor, not conformance — pairs with advisory-over-blocking framing.

Related

• companies/github