Code block markup does not follow recommendations by WHATWG, causes issues with 3rd party plugins

[testudor]

Environment

---

• Operating System: Linux
• Node Version: v18.18.0
• Nuxt Version: 3.11.2
• CLI Version: 3.11.1
• Nitro Version: 2.9.6
• Package Manager: [email protected]
• Builder: -
• User Config: devtools, modules, content
• Runtime Modules: @nuxt/[email protected]
• Build Modules: -

---

Reproduction

https://stackblitz.com/edit/github-9baaph?file=nuxt.config.ts,content%2Findex.md

Describe the bug

The WHATWG (Web Hypertext Application Technology Working Group) recommends code block markup to be structured as follows:

<pre>
  <code class="language-pascal">
    var i: Integer;
    begin
       i := 1;
    end.
  </code>
</pre>

(taken from https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-code-element)

Nuxt Content uses a different format, where the language-xxx class is placed on the pre element instead. This breaks compatibility with some 3rd party plugins such as https://github.com/remcohaszing/rehype-mermaid. Is there any good reason Nuxt Content does not follow the spec? Please also see the discussion here: remcohaszing/rehype-mermaid#15.

Additional context

No response

Logs

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