{{- $reveal_cdn := or .Page.Params.reveal_hugo.reveal_cdn .Site.Params.reveal_hugo.reveal_cdn "https://cdnjs.cloudflare.com/ajax/libs/reveal.js/3.6.0" -}} {{- $highlight_cdn := or .Page.Params.reveal_hugo.highlight_cdn .Site.Params.reveal_hugo.highlight_cdn "https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0" -}}