Error · duplicate-id
Repeated internal names
Lighthouse / axe call it: id attribute value must be unique
Two elements share the same internal name, which confuses assistive technology and can break forms.
Who it leaves out: blind people (screen readers) · people who can't use a mouse
How to fix it
Make each name unique. Developer task, listed precisely below.
In the code
Make every id unique on the page; duplicates break labels, ARIA references and anchors.
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Related errors
Automated testing covers roughly half of WCAG criteria; a full conformance claim also requires manual review. Technical information, not legal advice.