<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Non 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>
<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;
  }
</style>
<script>
  function spaceBefore(element) {
      var mnBeforeParent = element.parentNode.previousElementSibling;
      return element.getBoundingClientRect().left - mnBeforeParent.getBoundingClientRect().right;
  }

  function spaceAfter(element) {
      var mnAfterParent = element.parentNode.nextElementSibling;
      return mnAfterParent.getBoundingClientRect().left - element.getBoundingClientRect().right;
  }

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

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

      Array.from(document.querySelectorAll(".testedElement")).forEach(el => {
          test(function() {
              assert_true(MathMLFeatureDetection.has_operator_spacing());
              assert_approx_equals(spaceBefore(el), 0, epsilon);
              assert_approx_equals(spaceAfter(el), 2 * emToPx, epsilon);
          }, `${el.tagName} is not space-like`);
      });

      done();
  }
</script>
</head>
<body>
  <div id="log"></div>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <mroot class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
        </mroot>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <mfrac class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
        </mfrac>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <mi class="testedElement">X</mi>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <mmultiscripts class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
          <mtext>X</mtext>
        </mmultiscripts>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <mn class="testedElement">X</mn>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <mo class="testedElement" lspace="0" rspace="0">X</mo>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <mover class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
        </mover>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <munder class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
        </munder>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <ms class="testedElement">X</ms>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <munderover class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
          <mtext>X</mtext>
        </munderover>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <msup class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
        </msup>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <msub class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
        </msub>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <msubsup class="testedElement">
          <mtext>X</mtext>
          <mtext>X</mtext>
          <mtext>X</mtext>
        </msubsup>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <msqrt class="testedElement">
          <mtext>X</mtext>
        </msqrt>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
  <p>
    <math>
      <mn>X</mn>
      <mrow>
        <mtable class="testedElement">
          <mtr>
            <mtd>
              <mtext>X</mtext>
            </mtd>
          </mtr>
        </mtable>
        <mo lspace="1em" rspace="0em">X</mo>
      </mrow>
      <mn>X</mn>
    </math>
  </p>
</body>
</html>
