title: How can I show and hide a button after click?
body: <p>I tried this:</p>
  
  <pre><code>&lt;button onclick="button_onclick()"&gt;Click me&lt;/button&gt;
  </code></pre>
  
  <p>js:</p>
  
  <pre><code>button_onclick() = "this.style.visibility = 'hidden';"
  </code></pre>