
and <code>&amp;</code>) as well as control or “invisible” characters (like no-break spaces).</p>

<pre><code class="language-html bad">&lt;!-- Not recommended --&gt;
The currency symbol for the Euro is &amp;ldquo;&amp;eur;&amp;rdquo;.
</code></pre>

<pre><code class="language-html good">&lt;!-- Recommended --&gt;
The currency symbol for the Euro is “€”.
</code></pre>

<h4 id="Optional_Tags" class="numbered">Optional Tags</h4>

<p>Omit optional tags (optional).</p>

<p>For file size optimization a