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+<!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>