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chromium/third_party/blink/web_tests/editing/inserting/insert-text-remove-iframe-on-textInput-event.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
selection_test(
    '<iframe></iframe>',
    selection => {
        assert_own_property(window, 'textInputController',
                'this test requires window.textInputController.');
        const document = selection.document;
        const iframe = document.querySelector('iframe');
        iframe.contentDocument.documentElement.contentEditable = true;
        iframe.contentDocument.documentElement.addEventListener(
            'textInput',
            () => iframe.parentNode.removeChild(iframe));
        iframe.contentDocument.documentElement.focus();
        textInputController.setMarkedText('1', 0, 1);
        textInputController.insertText('x');
    },
    '',
    'Should not crash when textInput handler removes current frame when doing InsertText');
</script>