title: Using "THIS" inside function
body: <p>How can I use "this" in this case?
  I got an error.. The page can't set display at null or undefined.</p>
  
  <pre><code>&lt;button onclick="myFunction(this)"&gt;
  
  &lt;script&gt;
  function myFunction() {
  
  this.style.display='none';
  
  }
  &lt;/script&gt;
  </code></pre>