Sorry, I just found it’s not that. I have compared a default HTML with generated one and see extra span with class err - no idea why.
This is how it looks like by default:
<pre class="highlight"><code><span class="kd">defmodule</span><span class="w"> </span><span class="nc">ExampleModule</span><span class="w">
</span><span class="kd">def</span><span class="w"> </span><span class="nf">hello</span><span class="w"> </span><span class="k" data-group-id="6243670888-1">do</span><span class="w">
</span><span class="nc">IO</span><span class="o">.</span><span class="n">puts</span><span class="p" data-group-id="6243670888-2">(</span><span class="s">"Hello World"</span><span class="p" data-group-id="6243670888-2">)</span><span class="w">
</span><span class="k" data-group-id="6243670888-1">end</span><span class="w">
</span><span class="k">end</span><span class="w">
</span></code></pre>
and here it’s how I cut and paste exactly same code:
<pre class="highlight"><code><span class="kd">defmodule</span><span class="w"> </span><span class="nc">ExampleModule</span><span class="err">
</span><span class="w">
</span><span class="kd">def</span><span class="w"> </span><span class="nf">hello</span><span class="w"> </span><span class="k" data-group-id="5326747296-1">do</span><span class="err">
</span><span class="w">
</span><span class="nc">IO</span><span class="o">.</span><span class="n">puts</span><span class="p" data-group-id="5326747296-2">(</span><span class="s">"Hello World"</span><span class="p" data-group-id="5326747296-2">)</span><span class="err">
</span><span class="w">
</span><span class="k" data-group-id="5326747296-1">end</span><span class="err">
</span><span class="w">
</span><span class="k">end</span><span class="err">
</span><span class="w">
</span></code></pre>
Those span contains one newline character. When I remove that extra span, it’s contents or just set display to none then the code looks as expected.
