<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Subscripts and Superscripts parameters</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup">
<meta name="assert" content="Elements msub, msup, subsup and msubsup correctly use the italic correction 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 {
    font-size: 10px;
  }
  @font-face {
    font-family: largeop-displayoperatorminheight5000;
    src: url("/fonts/math/largeop-displayoperatorminheight5000.woff");
  }
  @font-face {
    font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;
    src: url("/fonts/math/largeop-displayoperatorminheight2000-2AFF-italiccorrection3000.woff");
  }
  @font-face {
    font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;
    src: url("/fonts/math/largeop-displayoperatorminheight7000-2AFF-italiccorrection5000.woff");
  }
</style>
<script>
  function getBox(aId) {
    return document.getElementById(aId).getBoundingClientRect();
  }

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

  /*
    These two tests verify that:
    - In msub, the script is at the right of the base minus the italic correction.
    - In msup, the script is just at the right of the base.
    - In msubsup, the scripts are shifted by the italic correction.
    - In mmultiscripts, postscript pairs are shifted by the italic correction.
    - In mmultiscripts, prescript pairs are vertically aligned.
  */
  var epsilon = 1;
  var emToPx = 10 / 1000; // font-size: 10px, font.em = 1000
  function runTests() {
    test(function() {
      assert_true(MathMLFeatureDetection.has_mspace());

      var v = 0;
      assert_approx_equals(getBox("base001").right - getBox("sub001").left, v, epsilon, "msub");
      assert_approx_equals(getBox("sup002").left, getBox("base002").right, epsilon, "msup");
      assert_approx_equals(getBox("sup003").left - getBox("sub003").left, v, epsilon, "msubsup");
      assert_approx_equals(getBox("sup004").left - getBox("sub004").left, v, epsilon, "mmultiscripts postscripts");
      assert_approx_equals(getBox("sup005").left - getBox("sub005").left, 0, epsilon, "mmultiscripts prescripts");
    }, "Null Italic Correction");
    test(function() {
      assert_true(MathMLFeatureDetection.has_mspace());

      var v = 3000 * emToPx;
      assert_approx_equals(getBox("base011").right - getBox("sub011").left, v, epsilon, "msub");
      assert_approx_equals(getBox("sup012").left, getBox("base012").right, epsilon, "msup");
      assert_approx_equals(getBox("sup013").left - getBox("sub013").left, v, epsilon, "msubsup");
      assert_approx_equals(getBox("sup014").left - getBox("sub014").left, v, epsilon, "mmultiscripts postscripts");
      assert_approx_equals(getBox("sup015").left - getBox("sub015").left, 0, epsilon, "mmultiscripts prescripts");
    }, "NonNull Italic Correction (MathGlyphVariantRecord)");
    test(function() {
      assert_true(MathMLFeatureDetection.has_mspace());

      var v = 5000 * emToPx;
      assert_approx_equals(getBox("base021").right - getBox("sub021").left, v, epsilon, "msub");
      assert_approx_equals(getBox("sup022").left, getBox("base022").right, epsilon, "msup");
      assert_approx_equals(getBox("sup023").left - getBox("sub023").left, v, epsilon, "msubsup");
      assert_approx_equals(getBox("sup024").left - getBox("sub024").left, v, epsilon, "mmultiscripts postscripts");
      assert_approx_equals(getBox("sup025").left - getBox("sub025").left, 0, epsilon, "mmultiscripts prescripts");
    }, "NonNull Italic Correction (GlyphAssembly)");
    done();
  }
</script>
</head>
<body>
  <div id="log"></div>
  <h2>Null Italic Correction</h2>
  <p>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight5000;">
      <msub>
        <mo id="base001" lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub001" height="1em" width="1em" style="background: blue"/>
      </msub>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight5000;">
      <msup>
        <mo id="base002" lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sup002" height="1em" width="1em" style="background: blue"/>
      </msup>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight5000;">
      <msubsup>
        <mo lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub003" height="1em" width="1em" style="background: blue"/>
        <mspace id="sup003" height="1em" width="1em" style="background: green"/>
      </msubsup>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight5000;">
      <mmultiscripts>
        <mo lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub004" height="1em" width="1em" style="background: blue"/>
        <mspace id="sup004" height="1em" width="1em" style="background: green"/>
        <mprescripts/>
        <mspace id="sub005" height="1em" width="1em" style="background: magenta"/>
        <mspace id="sup005" height="1em" width="1em" style="background: cyan"/>
      </mmultiscripts>
    </math>
  </p>
  <h2>NonNull Italic Correction (MathGlyphVariantRecord)</h2>
  <p>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;">
      <msub>
        <mo id="base011" lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub011" height="1em" width="1em" style="background: blue"/>
      </msub>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;">
      <msup>
        <mo id="base012" lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sup012" height="1em" width="1em" style="background: blue"/>
      </msup>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;">
      <msubsup>
        <mo lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub013" height="1em" width="1em" style="background: blue"/>
        <mspace id="sup013" height="1em" width="1em" style="background: green"/>
      </msubsup>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;">
      <mmultiscripts>
        <mo lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub014" height="1em" width="1em" style="background: blue"/>
        <mspace id="sup014" height="1em" width="1em" style="background: green"/>
        <mprescripts/>
        <mspace id="sub015" height="1em" width="1em" style="background: magenta"/>
        <mspace id="sup015" height="1em" width="1em" style="background: cyan"/>
      </mmultiscripts>
    </math>
  </p>
  <h2>NonNull Italic Correction (GlyphAssembly)</h2>
  <p>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;">
      <msub>
        <mo id="base021" lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub021" height="1em" width="1em" style="background: blue"/>
      </msub>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;">
      <msup>
        <mo id="base022" lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sup022" height="1em" width="1em" style="background: blue"/>
      </msup>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;">
      <msubsup>
        <mo lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub023" height="1em" width="1em" style="background: blue"/>
        <mspace id="sup023" height="1em" width="1em" style="background: green"/>
      </msubsup>
    </math>
    <math displaystyle="true" style="font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;">
      <mmultiscripts>
        <mo lspace="0px" rspace="0px">&#x2AFF;</mo>
        <mspace id="sub024" height="1em" width="1em" style="background: blue"/>
        <mspace id="sup024" height="1em" width="1em" style="background: green"/>
        <mprescripts/>
        <mspace id="sub025" height="1em" width="1em" style="background: magenta"/>
        <mspace id="sup025" height="1em" width="1em" style="background: cyan"/>
      </mmultiscripts>
    </math>
  </p>
</body>
</html>
