Auto Typing text Effect - Auto enter Text

Typing Effect - Auto enter Text

 <button onclick="typeWriter()">Click here</button>
 <p id='demo_txt'></p>
    
<script> 
var i = 0;
var txt = 'Technical Support By Techrigel Systems Pvt. LTD.';
var speed = 50;

function typeWriter() {
  if (i < txt.length) {
    document.getElementById("demo_txt").innerHTML += txt.charAt(i);
    i++;
    setTimeout(typeWriter, speed);
	} 
  } 
 
</script