ath/stretchy-centered-on-baseline.woff");
  }
</style>
<script>
  function runTests() {
      // Add a green frame around mo to avoid antialisasing/rounding issues.
      Array.from(document.getElementsByTagName('mo')).forEach(mo => {
          let box = mo.getBoundingClientRect();
          let div = document.createElement("div");
          div.className = 'frame';
          div.style.left = `${box.left-1}px`;
          div.style.top = `${box.top-1}px`;
          div.style.width = `${box.width+1}px`;
     