5px/1 Ahem;
  }
  @font-face {
      font-family: stretchy;
      src: url("/fonts/math/stretchy.woff");
  }
  mo {
      font-family: stretchy;
  }
</style>
<script>
  setup({ explicit_done: true });
  window.addEventListener("load", () => { loadAllFonts().then(runTests); });

  function runTests() {

      var epsilon = 2;
      var emToPx = 25;
      var element;

      test(function() {
          element = document.getElementById("horizontal_arrow");
          assert_approx_equals(element.getBoundingCli