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

<!--
@SCRIPT:
  busy.accessibilityAttributeValue(AXElementBusy)
  busy.accessibilityAttributeNames.has(AXElementBusy)
  default.accessibilityAttributeValue(AXElementBusy)
  default.accessibilityAttributeNames.has(AXElementBusy)
-->
<!DOCTYPE html>
<div id="busy" aria-busy="true"></div>
<div id="default"></div>