 testing.expectEqual(2, r1.height);

  // let r2 = document.getElementById('content').getBoundingClientRect();
  // testing.expectEqual(1, r2.x);
  // testing.expectEqual(0, r2.y);
  // testing.expectEqual(1, r2.width);
  // testing.expectEqual(1, r2.height);

  // let r3 = document.getElementById('para').getBoundingClientRect();
  // testing.expectEqual(0, r3.x);
  // testing.expectEqual(0, r3.y);
  // testing.expectEqual(1, r3.width);
  // testing.expectEqual(1, r3.height);

  // testing.expectEqual(1, pa