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chromium/third_party/blink/web_tests/external/wpt/mathml/presentation-markup/operators/mo-single-char-and-children-ref.html 

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  <head>
    <meta charset="utf-8">
    <title>&lt;mo&gt; with a single character and children (reference)</title>
    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css"/>
    <style>
      math { font: 25px/1 Ahem; }
    </style>
  </head>
  <body>
    <p>There should be 5/18em horizontal gaps around the middle rectangles:</p>
    <p><math><mn>p</mn><mo><span>X</span></mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo>X<span></span></mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo><span></span>X</mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo id="dynamic-add">X</mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo id="dynamic-text-add">XX</mo><mn>p</mn></math></p>

    <p>There should be no horizontal gap around the middle rectangles:</p>

    <p><math><mn>p</mn><mo stretchy="false" lspace="0" rspace="0">X</mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo id="dynamic-remove" stretchy="false" lspace="0" rspace="0"><span></span>X</mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo stretchy="false" lspace="0" rspace="0"><!-- COMMENT -->X</mo><mn>p</mn></math></p>

    <p>There should be 4/18em horizontal gaps around the middle rectangles:</p>
    <p><math><mn>p</mn><mo lspace="0.2222222222222222em" rspace="0.2222222222222222em">XX</mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo id="dynamic-text-add-2" lspace="0.2222222222222222em" rspace="0.2222222222222222em">XX</mo><mn>p</mn></math></p>

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