ra.clientWidth);
  // testing.expectEqual(1, para.clientHeight);

  // let r4 = document.createElement('div').getBoundingClientRect();
  // testing.expectEqual(0, r4.x);
  // testing.expectEqual(0, r4.y);
  // testing.expectEqual(0, r4.width);
  // testing.expectEqual(0, r4.height);
</script>

<script id=matches>
  const el = document.createElement('div');
  el.id = 'matches';
  el.className = 'ok';
  testing.expectEqual(true, el.matches('#matches'));
  testing.expectEqual(true, el.matches('.ok'));
  testin