duplicate-id-active
ID attribute value must be unique
Who might be affected
Screen Reader
Description
As implied by their property name, id values should be unique regardless of their accessibility.
Labeling interactable elements is an important part of accessibility and many labeling techniques use
ids to make link the labeled and labeling elements. When id values are not unique it might cause
confusion and misunderstanding with the UI by screen reader users.
Quick Fixes
Make sure that no interactable (focusable) element has a duplicate "id" value, and remove them if they exist.
How Users Are Affected
Screen readers will only refer to the first element with a certain id and skip each additional
element with the same id. The user will therefore not receive the full content.
WCAG Success criteria
This issue might cause elements to fail one or more of the following Success criteria:
4.1.1 Parsing (A)