sible-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">
<link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
<meta name="assert" content="Spacing is added around operators inside mrow-like elements.">
<script src="/mathml/support/feature-d