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This site aims to meet WCAG 2.1 Level AA as it comes, and it has no known failures at that level. Contrast, reflow, text spacing, keyboard operation, focus visibility and page structure have all been measured rather than assumed.

The Accessible switch in the header turns on a conforming alternate version. It carries the same content and the same functionality, presented so that four further Level AAA criteria are met: contrast at 7:1, targets at 44 by 44 pixels, a choice of light or dark theme with larger type, and no content that changes without being asked to.

Known exceptions at Level AAA

Two criteria are not met, and both are about the writing rather than the presentation, so no display mode can satisfy them:

• 3.1.3 Unusual Words — the posts use technical vocabulary without a glossary to define it.
• 3.1.5 Reading Level — the posts assume reading ability beyond lower secondary education and carry no plain-language summary.

Both are fixable by writing rather than by code, and neither is claimed. If something here is hard to use, that is a fault worth hearing about.