title: Import code from extarnal file to HTML
body: <p>Say I have a text file (test.txt) that contains only the following line:</p>
  
  <pre><code>&lt;h1&gt;Text text text text text&lt;/h1&gt;
  </code></pre>
  
  <p>Is there any command that I can call the contents from this text file in an HTML document, so the contents in the text file imports where the call is made, every time the side shows?</p>
  
  <p>Example: ?????"/test.txt"?????</p>