axe-core rule: aria-valid-attr-value
ARIA attributes have invalid values
What it is
ARIA attributes carry values that are not valid for that attribute (for example aria-expanded="yes" instead of "true", or aria-labelledby pointing at an id that does not exist).
Who it blocks
Screen reader users hear missing or wrong states and labels; an aria-labelledby pointing nowhere leaves the control unnamed.
How to fix it
Use the allowed values for each ARIA attribute, and verify that every id referenced by aria-labelledby or aria-describedby exists on the page.
Example fix
<!-- Before -->
<button aria-expanded="yes" aria-labelledby="missing-id">Filters</button>
<!-- After -->
<span id="filters-label">Product filters</span>
<button aria-expanded="true" aria-labelledby="filters-label">Filters</button>This is one of the barrier types BarrierScan checks for on every scan. Request a free accessibility scan to see whether it appears on your site, alongside the rest of the automated findings.