<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Stretch properties</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<link rel="help" href="https://w3c.github.io/mathml-core/#dictionary-based-attributes">
<meta name="assert" content="Verify ">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/fonts.js"></script>
<style>
  math {
      font: 25px/1 Ahem;
  }
  @font-face {
      font-family: operators;
      src: url("/fonts/math/operators.woff");
  }
  mo {
      font-family: operators;
  }
</style>
<script>
  setup({ explicit_done: true });
  window.addEventListener("load", () => { loadAllFonts().then(runTests); });

  function runTests() {

      var epsilon = 1;
      var emToPx = 25;
      var element;

      test(function() {
          element = document.getElementById("mn_vertical_line");
          assert_approx_equals(element.getBoundingClientRect().height, 1 * emToPx, epsilon, "<mn> element");

          element = document.getElementById("mo_prefix_vertical_line");
          assert_approx_equals(element.getBoundingClientRect().height, 6 * emToPx, epsilon, "Prefix <mo> element");

          element = document.getElementById("mo_infix_vertical_line");
          assert_approx_equals(element.getBoundingClientRect().height, 1 * emToPx, epsilon, "Infix <mo> element");

          element = document.getElementById("mo_postfix_vertical_line");
          assert_approx_equals(element.getBoundingClientRect().height, 6 * emToPx, epsilon, "Postfix <mo> element");
      }, `Stretchy vertical line`);

      done();
  }
</script>
</head>
<body>
  <div id="log"></div>
  <p>
    <math>
      <mrow>
        <!-- Some non-element nodes before -->
        <mo id="mo_prefix_vertical_line" style="color: green">|</mo>
        <mn id="mn_vertical_line">|</mn>
        <mspace width="1em" height="3em" depth="3em" style="background: blue"/>
        <mo id="mo_infix_vertical_line" lspace="0" rspace="0">|</mo>
        <mo id="mo_postfix_vertical_line" style="color: green">|</mo>
        <!-- Some non-element nodes after -->
      </mrow>
    </math>
  </p>
</body>
</html>
