File: mo-form-fallback.html

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8"/>
    <title>form fallback</title>
    <link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
    <meta name="assert" content="Verify fallback to postfix/prefix forms.">
    <link rel="match" href="mo-form-fallback-ref.html">
  </head>
  <body>

    <!-- The left (respectively right) parenthesis only has a prefix
         (respectively postfix) form which gives its stretchiness.
         In theory, the parenthesis in the middle of the <math> element are
         considered infix operators and should not stretch. Let's check that we
         fallback to the postfix/prefix forms and actually make them stretchy.
         This is to handle bad MathML markup that misses explicit <mrow> tags.
      -->

    <math>
      <mo>(</mo> <mspace height="3em" depth="3em"/> <mo>)</mo>
      <mo>(</mo> <mspace height="3em" depth="3em"/> <mo>)</mo>
    </math>

    <script src="/mathml/support/feature-detection.js"></script>
    <script>MathMLFeatureDetection.ensure_for_match_reftest("has_mspace");</script>
  </body>
</html>