Accessibility statement

We aim to meet the Web Content Accessibility Guidelines (WCAG) 2.2 at level AA. Every page works on a phone at 360 pixels wide without sideways scrolling, loads as text first on slow connections, and can be used with a keyboard and a screen reader. Diagrams carry text descriptions, and color contrast meets AA.

English is available now. Further languages, including French and Spanish, will follow.

How we test. We assess the site ourselves, with automated checks (axe-core) and by hand: keyboard only, a screen reader, reduced motion and a phone 360 pixels wide.

Known limitations. On small screens the diagrams scale down to fit, so their smallest labels are small. Each diagram has a full text description.

Last reviewed: October 18, 2026.

If something doesn't work for you, tell us and we will fix it.