title: How to make a button that shows a text or write a text on the site
body: <p>I am a beginner of html and php programming language</p>
  
  <p>I made some buttons, and I can't show any text when you press the button
  Code for function </p>
  
  <pre><code>&lt;script&gt;
      function produsul_cartezian() 
      {
          --
  
      }
  </code></pre>
  
  <p>echo() function dont work..
  and code for button</p>
  
  <pre><code>&lt;input type="button" value="Produsul cartezian" onclick="produsul_cartezian()" button class="btn success"&gt;
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/EsVa3.png" alt="site image"></p>