LayoutTests/fast/forms/focus-change-after-layout-update-during-focus-crash.html

<!DOCTYPE html>
<html>
<head>
    <script src="../../resources/js-test.js"></script>
    <script src="../../resources/ui-helper.js"></script>
</head>
<body>
    <input id="input">
    <input id="hidden" style="display: none" autofocus>
</body>
<script>
jsTestIsAsync = true;

addEventListener("load", async function() {
    description("This test verifies that we don't crash when focusing an element that triggers a layout change, resulting in a change of focus.");
    if (!window.testRunner)
        return;

    input.addEventListener("click", () => {
        hidden.style.display = "block";
        input.focus();

        testPassed("Did not crash.");
        finishJSTest();
    });

    await UIHelper.activateElement(input);
});

</script>
</html>