A snippet for wordpress's math PNGs

wp2mj.js

(function () {
var images = document.querySelectorAll('img.latex');
for (var i = 0; i < images.length; i++){
  var image = images[i];
  tex = image.getAttribute('alt');
  var preview = document.createElement('span');
  preview.setAttribute('class','MathJax_Preview');
  image.parentNode.insertBefore(preview, image);
  preview.appendChild(image);
  var script = document.createElement('script');
  script.type = 'math/tex';
  script.text= tex; // strip dollars from TeX string
  preview.parentNode.insertBefore(script, preview.nextSibling)
}
var mathjax = document.createElement('script');
mathjax.src= 'https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_CHTML-full';
document.head.appendChild(mathjax);
})();