 var prefixedMessage = new PrefixedMessageTest();
    prefixedMessage.onMessage(t.step_func_done((data, e) => {
      e.source.close();
      assert_equals(data.height, 402);
    }));
    var win = window.open(prefixedMessage.url(windowURL), '', width + features);
  }, `${format_value(features)} should set height of opened window`);
});

</script>
