This plugin provides syntax highlighting of code blocks using v8.8.0 of [[highlight.js|https://github.com/highlightjs/highlight.js]] from Ivan Sagalaev and others.
You can also specify the language as a MIME content type (eg `text/html` or `text/css`). The mapping is accomplished via mapping tiddlers whose titles start with `$:/config/HighlightPlugin/TypeMappings/`.