<style>
dialog { -webkit-mask-box-image-source: url(about:url); }
div { column-span: all; }
html { overflow: -webkit-paged-x; -webkit-perspective: 0vw; }
</style>
<script>
if (window.testRunner)
  testRunner.dumpAsText();
function runTest() {
  dialog.appendChild(document.createElement("div"));
  target.style.setProperty("overflow-wrap", "break-word");
  target.style.setProperty("-webkit-column-width", "1px");
}
</script>
<body id="target" onload=runTest()>
  <dialog id="dialog" open="true">PASS if no crash.</dialog>
</body>