<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Underscripts and Overscripts parameters</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#underscripts-and-overscripts-munder-mover-munderover">
<meta name="assert" content="Elements munder, mover, munderover correctly use the stretch stack parameters from the MATH table.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<script src="/mathml/support/fonts.js"></script>
<style>
  math, mspace, mo {
    font-size: 10px;
  }
  @font-face {
    font-family: bottomshiftdown3000;
    src: url("/fonts/math/stretchstack-bottomshiftdown3000.woff");
  }
  @font-face {
    font-family: gapbelowmin11000;
    src: url("/fonts/math/stretchstack-gapbelowmin11000.woff");
  }
  @font-face {
    font-family: topshiftup5000;
    src: url("/fonts/math/stretchstack-topshiftup5000.woff");
  }
  @font-face {
    font-family: gapabovemin7000;
    src: url("/fonts/math/stretchstack-gapabovemin7000.woff");
  }
</style>
<script>
  var emToPx = 10 / 1000; // font-size: 10px, font.em = 1000
  var epsilon = 1;

  function getBox(aId) {
    return document.getElementById(aId).getBoundingClientRect();
  }

  setup({ explicit_done: true });
  window.addEventListener("load", () => { loadAllFonts().then(runTests); });

  function runTests() {
    test(function() {
      assert_true(MathMLFeatureDetection.has_mspace());

      var v = 3000 * emToPx;
      assert_approx_equals(getBox("under00011").top - getBox("ref0001").bottom,
                           v, epsilon, "munder: under shift");
      assert_approx_equals(getBox("under00012").top - getBox("ref0001").bottom,
                           v, epsilon, "munderover: under shift");
    }, "StretchStackBottomShiftDown");

    test(function() {
      assert_true(MathMLFeatureDetection.has_mspace());

      var v = 11000 * emToPx;
      assert_approx_equals(getBox("under00021").top - getBox("ref0002").bottom,
                           v, epsilon, "munder: under gap");
      assert_approx_equals(getBox("under00022").top - getBox("ref0002").bottom,
                           v, epsilon, "munderover: under gap");
    }, "StretchStackGapBelowMin");

    test(function() {
      assert_true(MathMLFeatureDetection.has_mspace());

      var v = 5000 * emToPx;
      assert_approx_equals(getBox("ref0003").top - getBox("over00031").bottom,
                           v, epsilon, "mover: over shift");
      assert_approx_equals(getBox("ref0003").top - getBox("over00032").bottom,
                           v, epsilon, "munderover: over shift");
    }, "StretchStackTopShiftUp");

    test(function() {
      assert_true(MathMLFeatureDetection.has_mspace());

      var v = 7000 * emToPx;
      assert_approx_equals(getBox("ref0004").top - getBox("over00041").bottom,
                           v, epsilon, "mover: over shift");
      assert_approx_equals(getBox("ref0004").top - getBox("over00042").bottom,
                           v, epsilon, "munderover: over shift");
    }, "StretchStackGapAboveMin");

    done();
  }
</script>
</head>
<body>
  <div id="log"></div>
    <p>
      <math style="font-family: bottomshiftdown3000;">
        <mspace id="ref0001" height="1em" width="3em" style="background: green"/>
        <munder>
          <mo>&#x2192;</mo>
          <mspace id="under00011" depth="1em" width="3em" style="background: blue"/>
        </munder>
        <munderover>
          <mo>&#x2192;</mo>
          <mspace id="under00012" depth="1em" width="3em" style="background: blue"/>
          <mspace height="1em" width="3em" style="background: black"/>
        </munderover>
      </math>
    </p>
    <hr/>
    <p>
      <math style="font-family: gapbelowmin11000;">
        <mspace id="ref0002" height="1em" width="3em" style="background: green"/>
        <munder>
          <mo>&#x2192;</mo>
          <mspace id="under00021" depth="1em" width="3em" style="background: blue"/>
        </munder>
        <munderover>
          <mo>&#x2192;</mo>
          <mspace id="under00022" depth="1em" width="3em" style="background: blue"/>
          <mspace height="1em" width="3em" style="background: black"/>
        </munderover>
      </math>
    </p>
    <hr/>
    <p>
      <math style="font-family: topshiftup5000;">
        <mspace id="ref0003" height="1em" width="3em" style="background: green"/>
        <mover>
          <mo>&#x2192;</mo>
          <mspace id="over00031" height="1em" width="3em" style="background: blue"/>
        </mover>
        <munderover>
          <mo>&#x2192;</mo>
          <mspace height="1em" width="3em" style="background: black"/>
          <mspace id="over00032" height="1em" width="3em" style="background: blue"/>
        </munderover>
      </math>
    </p>
    <hr/>
    <p>
      <math style="font-family: gapabovemin7000;">
        <mspace id="ref0004" height="1em" width="3em" style="background: green"/>
        <mover>
          <mo>&#x2192;</mo>
          <mspace id="over00041" depth="1em" width="3em" style="background: blue"/>
        </mover>
        <munderover>
          <mo>&#x2192;</mo>
          <mspace height="1em" width="3em" style="background: black"/>
          <mspace id="over00042" depth="1em" width="3em" style="background: blue"/>
        </munderover>
      </math>
    </p>
</body>
</html>
