````
% pandoc -f html -t gfm
<div class="sourceCode" id="cb1"><pre
class="sourceCode ruby"><code class="sourceCode ruby"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test</span></span></code></pre></div>
^D
``` ruby
test
```
````

````
% pandoc -f html -t gfm
<pre
class="border language-ruby"><code class="sourceCode ruby"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">test</span></span></code></pre>
^D
``` ruby
test
```
````