chromium/content/test/data/accessibility/html/prohibited-name.html

<div aria-label="Illegal aria-label">
  Illegal aria-label moves to description
</div>
<div aria-label="Redundant aria-label ignored">
  Redundant aria-label ignored
</div>
<div aria-label="Nowhere for aria-label to go" aria-description="Manual description">
  Some inner content
</div>