MathJax requires internet connection

Visualization from HTML requires internet to load MathJax to render equations. Related issues:

• https://github.com/hakimel/reveal.js/issues/600

Possible solutions:

• https://github.com/JeremyHeleine/KaTeX-for-reveal.js
• https://github.com/hakimel/reveal.js/pull/2677#issue-422788407