<pre class=metadata>
Title: Foo
Group: test
Shortname: foo
Level: 1
Status: LS
ED: http://example.com/foo
Abstract: Make sure <code>, but not too much.
Editor: Example Editor
Date: 1970-01-01
</pre>

<h2 interface id=foo>this shouldn't have a code</h2>

<dfn interface>this should have one code</dfn>

<dfn interface><code>this one already has a code, shouldn't have a second</code></dfn>