It looks like this highlights code within <pre><code> blocks with a color scheme appropriate for the language, but it can't actually detect whether a snippet is

It looks like this highlights code within <pre><code> blocks with a color scheme appropriate for the language, but it can't actually detect whether a snippet is code in the first place. This is good to know about, although I personally care more about just displaying code blocks in a different typeface than I do about highlighting them appropriately.