PASS if no crash.
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}

new Document().createElementNS('http://www.w3.org/1999/xhtml', 'canvas').toBlob(
  () => { if (window.testRunner) testRunner.notifyDone(); });
</script>