Conditionally reveal related question
conditionally-reveal-related-question
Conditionally reveal a related question on the chosen radio/checkbox.
Description
A follow-up that only applies to one radio or checkbox should appear when that option is chosen, and stay hidden otherwise. That keeps related inputs with the choice that needs them instead of scattering always-visible extras across the page. Conditionally revealing the related question reduces noise for people who picked a different option. Fail if the related follow-up is always visible for every option, or if it never becomes available after the qualifying choice is made. Use this when grouping related inputs around radios or checkboxes.
When to use
A follow-up applies only after one radio or checkbox choice.
Not when
Not for always-needed fields that belong on the page for every choice.
Agent hint
Conditionally reveal the related follow-up when that radio or checkbox is chosen.
A follow-up that applies only to one choice is revealed when that radio/checkbox is chosen.
Related follow-up is always visible, or never available after the choice.
Citations
GOV.UK Design System — Radios; GOV.UK Design System — Checkboxes
https://design-system.service.gov.uk/components/radios/