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

<!--
@SCRIPT:
  autocomplete.accessibilityAttributeNames.has(AXAutocompleteValue)
  autocomplete.accessibilityAttributeValue(AXAutocompleteValue)
  not_applicable.accessibilityAttributeNames.has(AXAutocompleteValue)
  not_applicable.accessibilityAttributeValue(AXAutocompleteValue)
-->
<!DOCTYPE html>
<input id="autocomplete" aria-autocomplete="list">
<div id="not_applicable"></div>