      assert_approx_equals(document.getElementById("percent_minsize").getBoundingClientRect().height, 12 * emToPx, epsilon, "percent minsize");
          assert_approx_equals(document.getElementById("percent_maxsize").getBoundingClientRect().height, 3 * emToPx, epsilon, "percent maxsize");
      }, `minsize/maxsize percentages are relative to the target size`);

      test(function() {
          // These tests are not really strong:
          // - The smallest glyph for this stretchy operator is a 1em squar