Accessibility

The explainer is plain HTML with a little script. Browser zoom, reader modes and translation tools all work on it, and nothing essential depends on the script running.

The refrigerant cycle drawing

The loop diagram is hidden from screen readers because its content is repeated as a numbered list directly underneath: take heat, squeeze, give heat, release. The pulse that travels around the loop is an animation on the drawing only; with reduced motion switched on, the loop is drawn still and slightly faded instead.

The price-per-kWh calculator

The calculator has four fields: two number boxes for your unit rates and two drop-down lists for the efficiencies. Each has a label you can see and that a screen reader announces. Typing a new rate updates the three results straight away, and the result is also written as a sentence, which is read out politely after a change, so the bar chart is never the only way to get the answer. Out-of-range or empty entries fall back to the default prices rather than showing an error.

Colour

The site uses a blue-to-orange gradient to suggest cold and warm. It is decoration: nothing is conveyed by colour alone, and text sits on plain or very light backgrounds.

Motion on the home page

One line under the main heading sharpens into focus as it appears. It is not the heading itself, so the page's main text is never delayed, and it shows normally if motion is reduced or scripts are off.

Tables and figures

Comparison tables have proper header cells and captions, and the wider ones scroll sideways inside their own frame on small screens. The illustration of heat pump types carries a written description of all three panels.

Printing

Guides print cleanly from the browser, with the menus and form left in place but the text at full width. The calculator prints the values currently entered, so you can keep a record of a comparison made with your own tariff.

Telling us about a barrier

If something on the site gets in your way, use the form at the bottom of this page with the address of the page and what you were trying to do. SEO-DONS LTD replies by email.