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chromium/third_party/blink/web_tests/accessibility/aria-owns-dynamic-changes-2.html 

<!DOCTYPE HTML>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>

<div class="container">
    <div role="group">
        <ul id="future_parent" aria-owns="future_child"></ul>
    </div>

    <fieldset>
        <p>
          <mark></mark>
        </p>
    </fieldset>
</div>



<script>
test(function(t) {
    const axFutureParent = accessibilityController.accessibleElementById("future_parent");
    assert_equals(axFutureParent.childrenCount, 0);
    const futureParent = document.getElementById("future_parent");
    const child = document.createElement("li");
    child.id = "future_child";
    assert_equals(axFutureParent.childrenCount, 0, "before appending child");

    document.querySelector('mark').appendChild(child);
    assert_equals(axFutureParent.childrenCount, 1, "after appending child");
    assert_array_equals(futureParent.ariaOwnsElements, [child]);
}, "Aria-owns is dynamically recomputed.");
</script>
</script>