<style>
  head {
    display: block;
  }
  img {
    content: counter(section, lower-roman);
  }
</style>
<script>
  onload = async () => {
    if (window.testRunner) {
      testRunner.dumpAsText();
      testRunner.waitUntilDone();
    }
    document.designMode = 'on';
    let img0 = document.createElement('img');
    document.head.appendChild(img0);
    let embed0 = document.createElement('embed');
    embed0.src = 'data:';
    img0.appendChild(embed0);
    let div0 = document.createElement('div');
    img0.appendChild(div0);
    let input = document.createElement('input');
    div0.appendChild(input);
    getSelection().setBaseAndExtent(input, 0, input, 0);
    let promise = new Promise(function(resolve) {
      new EventSource('#').onerror = () => {
        document.execCommand('Indent');
        resolve();
      };
    });
    await new File([], '').text();
    document.execCommand('SelectAll');
    document.execCommand('Indent');
    await promise;
    document.body.innerHTML = "This test passes if it does not crash.";
    testRunner.notifyDone();
  };
</script>