MathJax version 3 configuration

mathjax.js

<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
<script type="text/javascript" id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
<script>
window.MathJax = {
  tex: {
    inlineMath: [ ['$','$'],['\\(','\\)'] ],
    displayMath: [ ['$$','$$'], ['\\[','\\]'] ],
    processEscapes: true,      
    processEnvironments: true, 
    processRefs: true       
  },
  options: {
   ignoreHtmlClass: 'tex2jax_ignore|editor-rich-text'
  }
};
</script>

https://webapps.stackexchange.com/a/153527/196564

Some useful links to configure mathjax:
https://docs.mathjax.org/en/latest/input/tex/macros/index.html
https://docs.mathjax.org/en/latest/options/input/tex.html#tex-options
https://www.onemathematicalcat.org/MathJaxDocumentation/TeXSyntax.htm
https://docs.mathjax.org/en/latest/input/tex/extensions/autoload.html#tex-autoload