<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Space-like elements</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<link rel="help" href="https://w3c.github.io/mathml-core/#definition-of-space-like-elements">
<link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
<link rel="help" href="https://w3c.github.io/mathml-core/#layout-of-mrow">
<meta name="assert" content="Verify definition of space-like elements">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<script src="/mathml/support/box-navigation.js"></script>
<style>
  /* Default spacing of operator 'X' is 0.2777777777777778em so quite different
     from the measured/specified 0em and 1em. */
  math, math * {
      font: 25px/1 Ahem;
  }
  mn {
      color: black;
  }
  mo {
      color: yellow;
  }
  .testedElement, .testedElement * {
      color: blue !important;
      background: blue !important;
  }
  .oof1 {
      position: absolute;
  }
  .oof2 {
      position: fixed;
  }
  .nobox {
      display: none;
  }
</style>
<script>
  function spaceBefore(id) {
      var element = document.getElementById(id);
      var mnBeforeParent = previousInFlowSibling(element.parentNode);
      return element.getBoundingClientRect().left - mnBeforeParent.getBoundingClientRect().right;
  }

  function spaceAfter(id) {
      var element = document.getElementById(id);
      var mnAfterParent = nextInFlowSibling(element.parentNode);
      return mnAfterParent.getBoundingClientRect().left - element.getBoundingClientRect().right;
  }

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

  function runTests() {
      var epsilon = 1;
      var emToPx = 25;

      test(function() {
          assert_true(MathMLFeatureDetection.has_operator_spacing());
          assert_approx_equals(spaceBefore("complex1"), emToPx, epsilon);
          assert_approx_equals(spaceAfter("complex1"), emToPx, epsilon);
      }, "complex space-like subtree");

      test(function() {
          assert_true(MathMLFeatureDetection.has_operator_spacing());
          assert_approx_equals(spaceBefore("complex1-bis"), emToPx, epsilon);
          assert_approx_equals(spaceAfter("complex1-bis"), emToPx, epsilon);
      }, "complex space-like subtree, from in-flow children");

      test(function() {
          assert_true(MathMLFeatureDetection.has_operator_spacing());
          assert_approx_equals(spaceBefore("complex2"), 0, epsilon);
          assert_approx_equals(spaceAfter("complex2"), 2 * emToPx, epsilon);
      }, "complex non-space-like subtree");

      test(function() {
          assert_true(MathMLFeatureDetection.has_operator_spacing());
          assert_approx_equals(spaceBefore("complex2-bis"), 0, epsilon);
          assert_approx_equals(spaceAfter("complex2-bis"), 2 * emToPx, epsilon);
      }, "complex non-space-like subtree, from in-flow children");

      done();
  }
</script>
</head>
<body>
  <div id="log"></div>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <!-- This element is space-like because it is made of nested
             mrow, mstyle, mpadded, mphantom, mtext, mspace
          -->
        <mrow class="testedElement" id="complex1">
          <mtext>X</mtext>
          <mstyle>
            <mstyle>
              <mtext>X</mtext>
              <mtext>X</mtext>
            </mstyle>
            <mtext>X</mtext>
            <mspace width="25px"></mspace>
            <mpadded>
              <mtext>X</mtext>
              <mrow></mrow>
              <mtext>X</mtext>
              <mspace width="25px"></mspace>
              <mphantom>
                <mtext>X</mtext>
                <mspace width="25px"></mspace>
              </mphantom>
              <mrow>
                <mtext>X</mtext>
                <mtext>X</mtext>
              </mrow>
              <mspace width="25px"></mspace>
            </mpadded>
            <mspace width="25px"></mspace>
            <mtext>X</mtext>
            <mspace width="25px"></mspace>
            <mpadded>
              <mphantom>
                <mtext>X</mtext>
                <mspace width="25px"></mspace>
              </mphantom>
              <mtext>X</mtext>
              <mtext>X</mtext>
              <mspace width="25px"></mspace>
              <mtext>X</mtext>
              <mtext>X</mtext>
              <mspace width="25px"></mspace>
              <mphantom>
                <mtext>X</mtext>
                <mspace width="25px"></mspace>
              </mphantom>
              <mtext>X</mtext>
              <mtext>X</mtext>
              <mspace width="25px"></mspace>
            </mpadded>
          </mstyle>
          <mspace width="25px"></mspace>
        </mrow>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
      <mn>X</mn>
      <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
      <mrow>
        <!-- This element is space-like because it is made of nested
             mrow, mstyle, mpadded, mphantom, mtext, mspace
          -->
        <mrow class="testedElement" id="complex1-bis">
          <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
          <mtext>X</mtext>
          <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
          <mstyle>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mstyle>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            </mstyle>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mtext>X</mtext>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mspace width="25px"></mspace>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mpadded>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mrow></mrow>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mphantom>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mspace width="25px"></mspace>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              </mphantom>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mrow>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              </mrow>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            </mpadded>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mspace width="25px"></mspace>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mtext>X</mtext>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mspace width="25px"></mspace>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mpadded>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mphantom>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mspace width="25px"></mspace>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              </mphantom>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mphantom>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mspace width="25px"></mspace>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              </mphantom>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            </mpadded>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
          </mstyle>
          <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
          <mspace width="25px"></mspace>
          <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
        </mrow>
        <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
        <mo lspace="1em" rspace="0em">X</mo>
        <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
      </mrow>
      <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
      <mn>X</mn>
      <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <!-- This element is not space-like. It is made of nested
             mrow, mstyle, mpadded, mphantom, mtext, mspace but contains
             one non-space like descendant (an mn element).
          -->
        <mrow class="testedElement" id="complex2">
          <mtext>X</mtext>
          <mstyle>
            <mstyle>
              <mtext>X</mtext>
              <mtext>X</mtext>
            </mstyle>
            <mtext>X</mtext>
            <mspace width="25px"></mspace>
            <mpadded>
              <mtext>X</mtext>
              <mrow></mrow>
              <mtext>X</mtext>
              <mspace width="25px"></mspace>
              <mphantom>
                <mtext>X</mtext>
                <mspace width="25px"></mspace>
              </mphantom>
              <mrow>
                <mtext>X</mtext>
                <mtext>X</mtext>
              </mrow>
              <mspace width="25px"></mspace>
            </mpadded>
            <mspace width="25px"></mspace>
            <mtext>X</mtext>
            <mspace width="25px"></mspace>
            <mpadded>
              <mphantom>
                <mn>X</mn> <!-- mn is not space-like -->
                <mspace width="25px"></mspace>
              </mphantom>
              <mtext>X</mtext>
              <mtext>X</mtext>
              <mspace width="25px"></mspace>
              <mtext>X</mtext>
              <mtext>X</mtext>
              <mspace width="25px"></mspace>
              <mphantom>
                <mtext>X</mtext>
                <mspace width="25px"></mspace>
              </mphantom>
              <mtext>X</mtext>
              <mtext>X</mtext>
              <mspace width="25px"></mspace>
            </mpadded>
          </mstyle>
          <mspace width="25px"></mspace>
        </mrow>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
      <mn>X</mn>
      <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
      <mrow>
        <!-- This element is not space-like. It is made of nested
             mrow, mstyle, mpadded, mphantom, mtext, mspace but contains
             one non-space like descendant (an mn element).
          -->
        <mrow class="testedElement" id="complex2-bis">
          <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
          <mtext>X</mtext>
          <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
          <mstyle>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mstyle>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            </mstyle>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mtext>X</mtext>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mspace width="25px"></mspace>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mpadded>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mrow></mrow>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mphantom>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mspace width="25px"></mspace>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              </mphantom>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mrow>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              </mrow>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            </mpadded>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mspace width="25px"></mspace>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mtext>X</mtext>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mspace width="25px"></mspace>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            <mpadded>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mphantom>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mn>X</mn> <!-- mn is not space-like -->
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mspace width="25px"></mspace>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              </mphantom>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mphantom>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mtext>X</mtext>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
                <mspace width="25px"></mspace>
                <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              </mphantom>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mtext>X</mtext>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
              <mspace width="25px"></mspace>
              <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
            </mpadded>
            <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
          </mstyle>
          <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
          <mspace width="25px"></mspace>
          <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
        </mrow>
        <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
        <mo lspace="1em" rspace="0em">X</mo>
        <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
      </mrow>
      <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
      <mn>X</mn>
      <mn class="oof1">0</mn><mn class="oof2">1</mn><mn class="nobox">2</mn>
    </math>
  </p>
</body>
</html>
