<style>
html {
    font-size: 100ex;
    widows: 2;
}
body {
    block-size: 300em;
    -webkit-column-axis: vertical;
}
a {
    padding-right: 100%;
}
blockquote {
    min-width: fit-content;
}
tr {
    block-size: 300em;
}
span {
    font-family: ui-serif;
    padding-right: 80%;
}
</style>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
onload = () => {
    let blockquote = document.createElement('blockquote');
    let span = document.createElement('span');
    blockquote.append(span);
    span.append('\uA6F8\uD83D\uDC00擄');
    span.append(document.createElement('tr'));
    document.body.append(blockquote);
    document.body.append(document.createElement('table'));
    document.execCommand('SelectAll');
    document.designMode = 'on';
    document.execCommand('CreateLink', false, '#');
    document.write("Test passes if it does not crash.");
};
</script>