HowToCodePage

Accessibility

Building sites everyone can use.

💡
This course has 3 lessons. Start with the first one and use the next / previous links at the bottom of each lesson — the sidebar keeps the whole course in order.

Lessons

  1. WCAG in plain languageThe four principles behind the guidelines, what the conformance levels mean, and the failures that account for most real-world barriers.
  2. Semantic HTML and keyboard accessWhy the right element is most of accessibility, how tab order really works, and the fixes that come free with native controls.
  3. Focus management, ARIA and testingMoving focus deliberately in dynamic interfaces, using ARIA only when needed, and a testing routine that finds real barriers.

More in Building a Website

SEO Basics Domains & DNS Web Hosting CDNs & Caching

Last refreshed 2026-09-17.