<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Preferred width of mrow-like elements</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#horizontally-group-sub-expressions-mrow">
<link rel="help" href="https://w3c.github.io/mathml-core/#style-change-mstyle">
<link rel="help" href="https://w3c.github.io/mathml-core/#making-sub-expressions-invisible-mphantom">
<link rel="help" href="https://w3c.github.io/mathml-core/#the-top-level-math-element">
<link rel="help" href="https://w3c.github.io/mathml-core/#adjust-space-around-content-mpadded">
<link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
<meta name="assert" content="The preferred width of mrow-like elements is the sum of children's width, modulo extra spacing.">
<script src="/mathml/support/feature-detection.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script type="text/javascript">
  setup({ explicit_done: true });
  window.addEventListener("load", runTests);
  function runTests()
  {
    var epsilon = 1;

    function MrowWidthFromChildren(mrow) {
      var first = mrow.firstElementChild.getBoundingClientRect();
      var last = mrow.lastElementChild.getBoundingClientRect();
      return last.right - first.left;
    }

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

      Array.from(document.getElementById("mspace-tests").getElementsByClassName("shrink-wrap")).forEach((container) => {
        var containerWidth = container.getBoundingClientRect().width;
        var mrow = container.getElementsByClassName("mrow-like")[0];
        var mrowWidth = MrowWidthFromChildren(mrow);
          assert_approx_equals(containerWidth, mrowWidth, epsilon, mrow.tagName);
      });
    }, "Preferred width of mrow with mspace children");

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

      Array.from(document.getElementById("tokens-tests").getElementsByClassName("shrink-wrap")).forEach((container) => {
        var containerWidth = container.getBoundingClientRect().width;
        var mrow = container.getElementsByClassName("mrow-like")[0];
        var mrowWidth = MrowWidthFromChildren(mrow);
        assert_approx_equals(containerWidth, mrowWidth, epsilon, mrow.tagName);
      });
    }, "Preferred width of mrow with mn and mo children");

    done();
  }
</script>
<style>
div.shrink-wrap {
  background: yellow;
  display: inline-block;
  margin-top: 5px;
  padding-top: 5px;
}
</style>
</head>
<body>
  <div id="log"></div>
  <div id="mspace-tests">
    <div><div class="shrink-wrap">
      <math><mrow class="mrow-like"><mspace width="30px" height="15px" style="background: blue"/><mspace width="20px" depth="30px" style="background: green"/><mspace width="15px" height="5px" depth="10px" style="background: black"/></mrow></math>
    </div></div>
    <div>
      <div class="shrink-wrap">
      <math><mstyle class="mrow-like"><mspace width="30px" height="15px" style="background: blue"/><mspace width="20px" depth="30px" style="background: green"/><mspace width="15px" height="5px" depth="10px" style="background: black"/></mstyle></math>
      </div>
    </div>
    <div>
      <div class="shrink-wrap">
      <math><mphantom class="mrow-like"><mspace width="30px" height="15px" style="background: blue"/><mspace width="20px" depth="30px" style="background: green"/><mspace width="15px" height="5px" depth="10px" style="background: black"/></mphantom></math>
      </div>
    </div>
    <div>
      <div class="shrink-wrap">
      <math class="mrow-like"><mspace width="30px" height="15px" style="background: blue"/><mspace width="20px" depth="30px" style="background: green"/><mspace width="15px" height="5px" depth="10px" style="background: black"/></math>
      </div>
    </div>
    <div>
      <div class="shrink-wrap">
      <math><unknown class="mrow-like"><mspace width="30px" height="15px" style="background: blue"/><mspace width="20px" depth="30px" style="background: green"/><mspace width="15px" height="5px" depth="10px" style="background: black"/></unknown></math>
      </div>
    </div>
    <div>
    </div>
  </div>
  <div id="tokens-tests">
    <div>
      <div class="shrink-wrap">
      <math><mrow class="mrow-like"><mtext>blah</mtext><mo lspace="30px" rspace="20px">|</mo><mn>2</mn></mrow></math>
      </div>
    </div>
    <div>
      <div class="shrink-wrap">
      <math><mstyle class="mrow-like"><mtext>blah</mtext><mo lspace="30px" rspace="20px">|</mo><mn>2</mn></mstyle></math>
      </div>
    </div>
    <div>
      <div class="shrink-wrap">
      <math><mphantom class="mrow-like"><mtext>blah</mtext><mo lspace="30px" rspace="20px">|</mo><mn>2</mn></mphantom></math>
      </div>
    </div>
    <div>
      <div class="shrink-wrap">
      <math class="mrow-like"><mtext>blah</mtext><mo lspace="30px" rspace="20px">|</mo><mn>2</mn></math>
      </div>
    </div>
    <div>
      <div class="shrink-wrap">
      <math><unknown class="mrow-like"><mtext>blah</mtext><mo lspace="30px" rspace="20px">|</mo><mn>2</mn></unknown></math>
      </div>
    </div>
  </div>
</p>
</body>
</html>
