github.com/anakojm/hugo-katex@v0.0.0-20231023141351-42d6f5de9c0b/tpl/tplimpl/embedded/templates/shortcodes/highlight.html

{{ if len .Params | eq 2 }}{{ highlight (trim .InnerDeindent "\n\r") (.Get 0) (.Get 1) }}{{ else }}{{ highlight (trim .InnerDeindent "\n\r") (.Get 0) "" }}{{ end }}