pandoc-3.9: test/command/11420.md
````
% pandoc -t revealjs --syntax-highlighting=idiomatic
# Slide
```python
def hello():
print("Hello")
```
^D
<section id="slide" class="slide level1">
<h1>Slide</h1>
<pre><code class="language-python">def hello():
print("Hello")</code></pre>
</section>
````