This example shows how to mix-and-match the components that are loaded (if there isn’t a combined component that includes what you need). This is done by setting the load array in the loader section of you MathJax configuration, as shown below.

The key lines are

  MathJax = {
    loader: {
      load: [
        'input/tex-base', '[tex]/newcommand', '[tex]/action',
    tex: {
      inlineMath: [['$', '$'], ['\\(', '\\)']],
      packages: ['base', 'newcommand', 'action']
  <script id="MathJax-script" async src=""></script>

Here, we specify the ‘tex-base’ input jax (which is TeX with no extra packages included), and explicitly load the newcommand and action extensions. We also load the chtml output jax, and the explorer assistive technology module.

The TeX configuration registers the loaded packages with the TeX input jax (it is possible to load extensions without initially enabling them).

The expression in the \texttip macro from the action module to add a tool-tip to part of the quadratic equation; hover the mouse over the discriminant to see.

Run the example