HTML CSS
(a quick guide)
Just use HTML Math symbols 1 + 1 ≠ 11 1 + 1 ≠ 11 ∛ 27 = 3 ∛ 27 = 3
LOAD MATHJAX <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script> <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
USING TEX SYNTAX $$\sum_{i=1}^nc=cn$$