Test();
    prefixedMessage.onMessage(t.step_func_done((data, e) => {
      e.source.close();
      assert_equals(data.width, 401);
    }));
    var win = window.open(prefixedMessage.url(windowURL), '', height + features);
  }, `${format_value(features)} should set width of opened window`);
});

[ 'innerheight=402',
  ' innerheight = 402',
  'innerheight==402',
  '\ninnerheight= 402',
  ',innerheight=402,,',
  'INNERHEIGHT=402',
  'innerHeight=402'
].forEach((features, idx, arr) => {
  async_test(t => {
   