make typing animation in JS code example

Example: typing ticker effect in html

<!DOCTYPE html>
<html>
<body>

<h1>Typewriter</h1>

<button onclick="typeWriter()">Click me</button>

<p id="demo"></p>

<script>
var i = 0;
var txt = "It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English.";
var speed = 30;

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

</body>
</html>

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Html Example