Accessibility

The target

This site aims to meet WCAG 2.2 level AA. That is a target that has been designed and tested for — it is not a certification, and nobody has audited this site externally.

What has been done

• Semantic HTML throughout: real headings in order, real lists, real tables with header cells, landmarks, and a skip link to the main content.
• Every interactive control is reachable and operable by keyboard, with a visible focus indicator that is not removed anywhere.
• Colour contrast in both light and dark themes was checked against the 4.5:1 target for body text and 3:1 for large text and interface borders.
• Form fields have persistent labels, not placeholders standing in for labels. Errors are announced, associated with their field, and described in words rather than colour alone.
• Motion respects prefers-reduced-motion; nothing moves or auto-plays without being asked to.
• Diagrams are accessible SVG with text descriptions, and the explanation is in the prose as well as the picture. No information is presented only in a canvas or only in an image.
• The site is usable without JavaScript. Search and filtering are enhancements; every catalogue page lists its full contents in the HTML.
• Layouts were checked at 360, 390, 768, 1024 and 1440 pixels wide, and at 200% zoom, without horizontal scrolling or clipped content.

What is known to be incomplete

• No testing with real assistive-technology users has been done. Automated and manual keyboard testing is not a substitute for that.
• Video episodes are linked rather than embedded. Where a captioned version or transcript does not exist, the entry says so rather than implying one does.
• Long code samples scroll horizontally on narrow screens. They are focusable and keyboard-scrollable, but they remain awkward on a phone.

Telling me about a problem

If something here is not usable for you, please say so through the contact form. Accessibility defects are treated as defects, not as feature requests.