window.MathJax = {
    loader: {load: ['[tex]/braket']},
    tex: {packages: {'[+]': ['braket']}}
    tex2jax: {
        inlineMath: [['$', '$'], ['$$', '$$']],
        processEscapes: true
    }
};

(function () {
    var script = document.createElement('script');
    script.src = 'https://polyfill.io/v3/polyfill.min.js?features=es6'
    script.src = 'https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML';
    script.async = true;
    document.head.appendChild(script);
})();

@@ -16,87 +16,8 @@
 = %7B%0A
-    loader: %7Bload: %5B'%5Btex%5D/braket'%5D%7D,%0A    tex: %7Bpackages: %7B'%5B+%5D': %5B'braket'%5D%7D%7D%0A
     

fix typo