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clone.MathJax-demos-web
/
mml-attribute.html

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width">
  <title>Add a data-mathml attribute to each math element</title>
  <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
  <script>
  MathJax = {
    startup: {
      ready: function () {
        //
        //  Do the usual startup ready actions (create document, input/output jax, etc).
        //
        MathJax.startup.defaultReady();
        const toMML = MathJax.startup.toMML;
        //
        //  Add a post-filter to the output jax to add the extra attributes
        //
        MathJax.startup.output.postFilters.add((args) => {
          const math = args.math, node = args.data;
          const original = (math.math ? math.math :
                            math.inputJax.processStrings ? '' : math.start.node.outerHTML);
          node.setAttribute('data-original', original);
          node.setAttribute('data-mathml', toMML(math.root).replace(/\n\s*/g, ''));
        });
      }
    }
  };
  </script>
  <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js"></script>
</head>
<body>

<p>
This math will have a <code>data-mathml</code> attribute containing
the MathML representation of the expression, and a
<code>data-original</code> attribute holding the original TeX format
of the expression.  Inspect the document DOM to see these in place
(on the <code>mjx-container</code> element).
</p>

$$\sqrt{\frac{1+x}{1-x}}$$

</body>
</html>