title: iframe embed with variable as src in pug is not working
body: <p>This is the code that was working with ejs:</p>
  
  <pre><code>&lt;iframe width="660" height="371" src="&lt;%= revive.reviveVideo %&gt;"&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>What is the equivalent of this in pug? Tried this but it did not work:</p>
  
  <pre><code>iframe(width='660', height='371', src='#{revive.reviveVideo}')
  </code></pre>
  
  <p>If I change the variable to the actual path it works just fine... It's an issue with the syntax of the variable...</p>