for katex
<custom-element>
for Katex.
See Katex website for more information about Katex.
Load the module
<script src="dist/katex-element.umd.js" type="module"></script>
Use the <katex-element>
where you want
<katex-element>\sqrt{x}</katex-element>
Full example:
<!DOCTYPE html>
<html>
<head>
<script src="dist/katex-element.umd.js" type="module"></script>
</head>
<body>
<katex-element>\sqrt{x}</katex-element>
</body>
</html>