Regression test, tabs
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Term 1
  :		code block

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<dl data-sourcepos="1:1-2:15">
<dt data-sourcepos="1:1-1:6">Term 1</dt>
<dd data-sourcepos="2:6-2:15">
<pre><code data-sourcepos="2:6-2:15">code block
</code></pre>
</dd>
</dl>