`highlight.js` seems to be one of the most popular libraries for syntax highlighting. Sometimes, its "auto guessing the language" feature leads to strange results. The feature can be turned off using "`nohighlight`" (instead of "`language-...`") as class for the `code` ```html <pre><code class="nohighlight">...</code></pre> ``` Currently, flexmark renders fenced code blocks without language specification as `code` without a class attribute, thus "triggering" the auto guessing feature. It would be nice to be able to prevent auto guessing for the complete generated markup with a new option `FENCED_CODE_LANGUAGE_DEFAULT_CLASS`. When set, fenced code blocks without language would be rendered as `code` with a `class` attribute with the specified value. Setting `FENCED_CODE_LANGUAGE_DEFAULT_CLASS = "nohighlight"` would then turn off auto guessing for the complete generated document.