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Created attachment 14803 [details]
Screenshot of MediaWiki rendering

Wikitext:

=== Example ===
Foo <code>bar</code> baz.
You'll want to add <source lang="javascript">
        "predef": [
                "OO",
        ]
</source> x y.


In MediaWiki's PHP parser:

  <h3>..</h3>
  <p>Foo <code>bar</code> baz.</p>
  <p>You'll want to add</p>
  <div> .. syntax highlgiht ..
  <p>x y.</p>

In Parsoid:

  <h3>..</h3>
  <p>Foo <code>bar</code> baz.</p>
  You'll want to add
  <div> .. syntax highlgiht ..
  x y.

Notice the lack of paragraphs from the Parsoid DOM, though this is odd, it still renders fine visually in browsers.

In VisualEditor:

  <h3 class="ve-ce-branchNode">Naming</h3>
  <p class="ve-ce-generated-wrapper ve-ce-branchNode">
    You'll want to add&nbsp;
    <span class="ve-ce-leafNode ve-ce-generatedContentNode ve-ce-mwExtensionNode ve-ce-mwAlienExtensionNode ve-ce-protectedNode" contenteditable="false">
      <div dir="ltr" class="mw-geshi mw-code mw-content-ltr" typeof="mw:Extension/source" data-mw=".." about="#mwt24">..</div>
    </span>
    &nbsp;x y.
  </p>

It renders as an inline-block within a paragraph, that's where it goes wrong.