Custom attributes not working on headings

[hacknug]

Environment

• Operating System: Darwin
• Node Version: v16.13.1
• Nuxt Version: 3.0.0-rc.4
• Package Manager: [email protected]
• Builder: vite
• User Config: modules, content
• Runtime Modules: @nuxt/[email protected], @nuxtjs/[email protected]
• Build Modules: -

Reproduction

Open the playground and paste the following code:

# Doesn't [work]{.font-bold}

# [This one either]{.font-bold}

Does [work]{.font-bold}

[This one too]{.font-bold}

Describe the bug

You'll see how the AST shows the paragraphs getting their props but the headings get nothing.

Additional context

This is likely something related to rehype-slug. It's probably passing things down but the plugin ignores them.

I'd expect those attributes to be passed down to my inner span since I understand why this could be something not supported in projects using rehype-slug.

Even when disabling rehype-slug via config, I'm seeing links on those headings. The only difference is the headings don't get an id assigned and a warning shows in my console:

[Vue warn]: Missing required prop: "id"

---

This wasn't as easy to get to as I would have liked since the docs stated I could disable a plugin using the following config but v2.0.1 had no support for that syntax.

  content: {
    markdown: {
      rehypePlugins: {
        'rehype-slug': false
      },
    },
  },

Might be a good idea to keep the versioned docs and edge in different subdomains/dirs. It's okay though since we all understand the tremendous work you're putting into this just to give it away for free 💖

Let me know how I can help with this 👍

Logs

No response