<script>
if (window.testRunner)
    testRunner.dumpAsText();

function boom() {
  setTimeout('document.querySelector("progress").setAttribute("style", "overflow: scroll; border-style: dotted;");', 10);
}
window.onload = boom;
</script>
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    <span style="position: fixed; visibility: collapse;">
      <span style="visibility: visible;">
        <progress></progress>
      </span>
    </span>
  </span>
  <div>Bug <a href="https://bugs.webkit.org/show_bug.cgi?id=64842">64842</a>: RenderDeprecatedFlexibleBox does not call its children's layout method</div>
  <div>This test passes if it does not CRASH.</div>
</body>