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chromium/content/test/data/accessibility/mac/attributes/ax-visited.html 

<!--
@SCRIPT:
  a.accessibilityAttributeNames.has(AXVisited)
  a.accessibilityAttributeValue(AXVisited)
  // Todo: test link after being visited.
-->
<!DOCTYPE html>
<a id="a" href="https://example.com">link</a>