rl("/fonts/math/stack-gapmin8000.woff");
  }
  @font-face {
    font-family: topdisplaystyleshiftup3000-axisheight1000;
    src: url("/fonts/math/stack-topdisplaystyleshiftup3000-axisheight1000.woff");
  }
  @font-face {
    font-family: topshiftup9000-axisheight1000;
    src: url("/fonts/math/stack-topshiftup9000-axisheight1000.woff");
  }
</style>
<script>
  var emToPx = 10 / 1000; // font-size: 10px, font.em = 1000
  var epsilon = 1;

  function getBox(aId) {
    return document.getElementById(aId).getBo