chromium/third_party/blink/web_tests/accessibility/aria-tables.html

<script src="../resources/js-test.js"></script>
<script src="../resources/accessibility-helper.js"></script>
<body id="body">
  <div id="container">
    <div role="grid">
      <div role="row">
        <div role="columnheader">col head 1</div>
        <div role="columnheader">col head 2</div>
        <div role="columnheader">col head 3</div>
      </div>
      <div role="row">
        <div role="rowheader">row head< 1/div>
        <div role="gridcell">data</div>
        <div role="rowheader">row head 2</div>
      </div>
      <div role="row">
        <div role="rowheader">row head 3</div>
        <div role="rowheader">row head 4</div>
        <div role="columnheader">col head 4</div>
      </div>
    </div>
  </div>
<p>End of test</p>
<div id="console"></div>
<script>
  if (window.accessibilityController) {
    var container = accessibilityController.accessibleElementById("container");
    buildAccessibilityTree(container, 0, 1, ['AXColumn', 'AXTableHeaderContainer']);
}
</script>
</body>