title: w3c validator gives 'document type does not allow element "input" here...' error
body: <p>I got this error when validating my page with w3c's validator.
  <img src="https://i.stack.imgur.com/a9wIX.png" alt="I got this error when validating my page with w3c&#39;s validator."></p>
  
  <p><strong>Source:</strong></p>
  
  <pre><code>&lt;form action="form.php" method="post"&gt;
  &lt;input type="text"/&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>Can someone show me why I may have gotten this error? Thanks in advance!</p>