Support for <pre><code>

[CHHUM]

I know you rejected the enhancement request for this so its unlikely to make it in, but I thought I’d offer it anyway.

This adds an option to use <code><pre> for code blocks, since the recommended way to mark up a code block (both is a <pre> element with a <code> element inside, like so:

<pre><code class="language-css">p { color: red }</code></pre>

I also add a line numbers class in pre for utilities such as prism that respect this. I’ve not made this optional but obviously could do.

I’ve tried to make the changes very minimal and obvious.

If you do want to incorporate the changes I can make the necessary mods to the docs as well.

I shared my copy of the verification document (here, but only you have access, not random passers-by)