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chromium/third_party/blink/web_tests/accessibility/chromium-only-roles.html 

<!DOCTYPE HTML>
<html>
<body>
<script src="../resources/js-test.js"></script>

<div id="container" contentEditable>
  <hr aria-label="hr">
  <p aria-label="p"></p>
  <label aria-label="label"></label>
  <form aria-label="form"></form>
  <div aria-label="div"></div>
</div>

<div id="console"></div>
<script>
description("This test makes sure that a generic focusable div can get accessibility focus.");

if (window.testRunner && window.accessibilityController) {
    testRunner.dumpAsText();

    document.getElementById('container').focus();
    var axContainer = accessibilityController.focusedElement;

    shouldBe('axContainer.childAtIndex(0).role', '"AXRole: AXSplitter"');
    shouldBe('axContainer.childAtIndex(1).role', '"AXRole: AXParagraph"');
    shouldBe('axContainer.childAtIndex(2).role', '"AXRole: AXLabelText"');
    shouldBe('axContainer.childAtIndex(3).role', '"AXRole: AXForm"');
    shouldBe('axContainer.childAtIndex(4).role', '"AXRole: AXGenericContainer"');
}

</script>

</body>
</html>