SiteDesign Systems & Foundations · Accessibility
Tool that suggests the nearest passing colour alternatives when a pair fails contrast, instead of just reporting failure.
Why it’s a gem
Proposes fixes rather than only flagging failures — rare and immediately useful.
W3C's reference implementations for thirty accessible widget patterns, each with keyboard maps, ARIA semantics and working examples.
Heydon Pickering's long-form teardowns of eleven UI patterns, each reasoning from markup semantics to progressive enhancement.
Command-line tool that checks colour contrast across a palette or config file, suitable for CI pipelines.
Browser extension that renders a document's heading outline and flags skipped or misordered heading levels instantly.
Automation library that drives real VoiceOver and NVDA screen readers from Playwright or Jest for end-to-end a11y tests.
T-Mobile's generator that produces accessibility acceptance criteria per component for web, iOS and Android test plans.