katex-header.html

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.10.0/dist/katex.min.css"
    integrity="sha384-9eLZqc9ds8eNjO3TmqPeYcDj8n+Qfa4nuSiGYa6DjLNcv9BtN69ZIulL9+8CqC9Y" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/katex@0.10.0/dist/katex.min.js"
    integrity="sha384-K3vbOmF2BtaVai+Qk37uypf7VrgBubhQreNQe9aGsz9lB63dIFiQVlJbr92dw2Lx"
    crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/katex@0.10.0/dist/contrib/auto-render.min.js"
    integrity="sha384-kmZOZB5ObwgQnS/DuDg6TScgOiWWBiVt0plIRkZCmE6rDZGrEOQeHM5PcHi+nyqe"
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<script>
    document.addEventListener("DOMContentLoaded", function () {
        renderMathInElement(document.body, {
            delimiters: [
                { left: "$$", right: "$$", display: true },
                { left: "\\(", right: "\\)", display: false },
                { left: "$", right: "$", display: false },
                { left: "\\[", right: "\\]", display: true }
            ]
        });
    });
</script>