Our approach
This site is built to be usable with a keyboard alone, with assistive technology, and at increased text sizes. It targets the Web Content Accessibility Guidelines 2.1 at level AA as a design goal.
What is implemented
- Semantic HTML landmarks, headings in order, and labelled form controls throughout.
- Visible focus styles on every interactive element, and dropdown menus that open with the keyboard and close on Escape.
- Colour contrast tested against WCAG AA for body text and interface components.
- Layouts that reflow to a single column without horizontal scrolling down to 320 pixels wide.
- Data conveyed by colour - gains and losses - always carries a sign or a label as well.
- Charts are decorative summaries of data that is also available in adjacent tables.
Known limitations
The live-updating calculator sliders announce their values through the associated label, but do not currently emit ARIA live-region updates as results change.
Feedback
Accessibility problems can be reported through the contact form.
Last updated October 24, 2026.