Accessibility
Accessibility
This site targets the mechanisms of WCAG 2.2 level AA. That is a design target honestly stated, not a claim of audited conformance. This site has not yet undergone an independent accessibility audit or assistive-technology user test.
What is built in
- Keyboard first — every control, including the calculators and the mobile menu, operates with a keyboard alone; a skip link precedes the navigation; focus is always visible.
- Works without JavaScript — every calculator page renders a labelled worked example, the formula in words and a blank worksheet; navigation uses a native disclosure element, not a scripted menu.
- Screen-reader semantics — one
h1per page, labelled form controls, fieldset/legend question groups, a single polite live region per calculator for results and an alert region for validation messages. - Not colour alone — error and stop states pair colour with text prefixes and borders; the elevation diagram’s legend names each state in words.
- Touch targets — interactive elements aim for 44 px minimum in each dimension.
- Reduced motion — the site’s single animation (the result-panel wipe) is removed entirely under
prefers-reduced-motion. - Print — calculator sheets print as black-on-white plan records that survive photocopying.
- Zoom and reflow — layouts reflow to 340 px-wide viewports without horizontal scrolling.
Known limitations
- No formal audit or assistive-technology user testing has been performed yet.
- The tri-state answer buttons rely on modern CSS for their selected styling; on very old browsers the selected state falls back to the native radio indicator, which remains functional.
- The SVG diagrams are described in text alternatives, but their full detail is inherently visual; the information they carry is always repeated in nearby text.
Feedback
This site does not currently provide a contact form or published inbox (see the privacy sheet). When the site gains a feedback channel, it will be announced here and accessibility reports will be prioritised through it.
Statement written for content contract 2026-08-20.2. Changes are recorded on the methodology sheet.