);
  one.stopPropagation();
  one.cancelBubble = false;
  assert_true(one.cancelBubble, "cancelBubble must still be true after attempting to set it to false.");
}, "Event.cancelBubble=false must have no effect.");

test(function (t) {
  var outer = document.getElementById('outer');
  var middle = document.getElementById('middle');
  var inner = document.getElementById('inner');

  outer.addEventListener('barbaz', t.step_func(function () {
    assert_unreached("Setting Event.cancelBubble=false after setting 