HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaOwnsElements vs attribute</title>
</head>
<body>
  <div id="parentMenu" role="menubar" aria-owns="subMenu1">Top level menu</div>
  <div>Some other element</div>
  <div id="subMenu1" role="menu">
    <a href="#" role="menuitem">Menu item 1</a>
  </div>
  <pre id="out"></pre>
  <script>
    var parentMenu = document.querySelector("#parentMenu");
    document.getElementById("out").textContent = JSON.stringify({
      fromAttribute: parentMenu.getAttribute("aria-owns"),
      supported: "ariaOwnsElements" in Element.prototype,
      fromProperty: "ariaOwnsElements" in Element.prototype
        ? parentMenu.ariaOwnsElements.map(function (el) { return el.id; })
        : null
    }, null, 2);
  </script>
</body>
</html>

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Element.ariaOwnsElements — vs attribute (Try It)