sions-invisible-mphantom">
<link rel="help" href="https://w3c.github.io/mathml-core/#the-top-level-math-element">
<link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.menclose">
<link rel="help" href="https://w3c.github.io/mathml-core/#adjust-space-around-content-mpadded">
<meta name="assert" content="Baseline for mrow-like elements is correct.">
<script src="/mathml/support/feature-detection.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharn