title: HTML attribute with/without quotes
body: <p>Is there any difference between the following code blocks?</p>
  <pre class="lang-html prettyprint-override"><code>&lt;iframe src=&quot;http://example.com&quot; width=100%&gt;&lt;/iframe&gt;
  </code></pre>
  <pre class="lang-html prettyprint-override"><code>&lt;iframe src=http://example.com width=&quot;100%&quot;&gt;&lt;/iframe&gt;
  </code></pre>
  <p>I've tried both and both seem to work, but I'm asking just in case there's something I need to be careful with?</p>