<code class="lang-html">
<h1>Heading Level 1</h1>
<span class="h1">Heading Level 1</span>
</code></pre>

<div class="example">
  <h2>Heading Level 2</h2>
</div>

<pre><code class="lang-html">
<h2>Heading Level 2</h2>
<span class="h2">Heading Level 2</span>
</code></pre>

<div class="example">
  <h3>Heading Level 3</h3>
</div>

<pre><code class="lang-html">
<h3>Heading Level 3</h3>
<span class="h3">Heading Level 3</span>
</code></pre>

<div class="example">
  <h4>Heading Level 4</h4>
</div>

<pre><code class