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An update on the accessibility of conditionally revealed questions

• A GOV.UK blog about the ‘conditional reveal’ option in the GDS Design System’s radio and checkbox components.
• The GOV.UK Accessibility Team discovered that the implementation failed WCAG 2.1 Success Criterion 4.1.2: Name, Role, Value, as the act of conditionally revealing content would not notify some screen reader users.
• This came down to the use of aria-expanded, which the team later realised was “not supported for the role of a radio button or checkbox in the ARIA specification.”
• Further user research found that some users were in fact notified of changes, despite it not being supported. Additionally, the notification did help users; so they brought their findings to the ARIA Working Group for consideration.
• The team then prototyped a few different ways of improving the relationship between the question and the revealed content. The conclusion was to avoid using “multiple fields or text content (like warning text) within reveals”. Simple questions with a single input were fine.

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