<style>
  html {
    -webkit-user-modify: read-write;
  }
  span {
    padding: 1px;
  }
  div {
    padding: 123456789px;
  }
  div:only-child, div:nth-child(2) {
    float: left;
  }
</style>
<body>
<!-- PASS if no crash or assert. -->
<span></span><div><div></body>
<script>
if (window.testRunner)
  testRunner.dumpAsText();
    
let firstDiv = document.createElement('div');
document.body.appendChild(firstDiv);
firstDiv.appendChild(document.createElement('div'));
let middleDiv = document.createElement('div');
document.body.appendChild(middleDiv);
middleDiv.appendChild(document.createElement('span'));
middleDiv.appendChild(document.createElement('div'));
let lastDiv = document.createElement('div');
middleDiv.appendChild(lastDiv);
lastDiv.appendChild(document.createElement('div'));

document.execCommand('SelectAll');
document.execCommand('Delete');
</script>