Getting to the answer, however you use the web.

What is built in

• Every calculator works from the keyboard alone, and the focus outline is visible on a real background rather than assumed.
• Answers are announced when they change: the headline figure is a live region, so a screen reader hears the new number without hunting for it.
• Motion respects prefers-reduced-motion. The scroll animations, the smooth scrolling and the counting figures all stop — not shorten — and the page simply is what it is.
• Nothing is conveyed by colour alone. A withheld figure is marked and labelled, not merely tinted.
• Text reflows to 320px without a horizontal scrollbar, and wide tables scroll inside their own box rather than the page.
• Every page works without JavaScript for reading; the calculators need it to calculate, but nothing is hidden waiting for a script that may not arrive.

What has not been done

There has been no formal WCAG audit and no testing with real assistive technology users. The measures above are the result of care during construction, which is not the same as verification. Treating them as a compliance claim would be overstating them.

If something gets in your way

Tell us what happened and what you were using — that is more useful than a standards reference, and it gets fixed faster. baireecoal@gmail.com.