Check controls in system high contrast settings

What to change

Ask the supplier to test the main journey with a supported system contrast mode as well as the normal theme.

A worked example

Illustrative example

A checked contact-preference option retains a visible check marker, and the focused Continue button remains identifiable when the system changes the page colours.

How to check the result

Accept when essential controls and their states remain operable in the agreed contrast setting without needing to revert to the original theme.

A mistake to avoid

A screenshot of dark mode is not a substitute for testing the operating system's own contrast behaviour.

Your action checklist

Use these checks to prepare a discussion with your team or supplier. Tick a check when you have recorded the decision or evidence, rather than when a feature has simply been promised.

Decisions to recordEnable the setting in a suitable test device and inspect checkboxes, radio choices, focus outlines and icon buttons. Look for missing boundaries or selection markers.Complete a short form using the keyboard. Confirm that the current focus, selected answers and error states remain distinguishable throughout the task.Ask the supplier to demonstrate any adjusted rendering. The design should respect the user's chosen colours rather than forcing decorative backgrounds to remain unchanged.

Evidence, open questions and decisionsNext action and responsible role

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