LayoutTests/editing/execCommand/default-paragraph-separator-crash.html

<script>
    if (window.testRunner)
       window.testRunner.dumpAsText();
    onload = () => {
        let output0 = document.createElement('output');
        document.body.appendChild(output0);
        let h1 = document.createElement('h1');
        output0.appendChild(h1);
        let table0 = document.createElement('table');
        h1.appendChild(table0);
        table0.appendChild(document.createElement('h1'));
        output0.appendChild(document.createElement('div'));
        document.designMode = 'on';
        document.execCommand('SelectAll');
        document.execCommand('DefaultParagraphSeparator', false, 'p');
        document.execCommand('JustifyRight');
        document.execCommand('Undo');
        document.write("Test passes if it does not crash.");
    };
</script>