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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<body>
​
<p>Click the button to locate the first occurrence of the letter "e".</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var str = "Hello world, welcome to the universe.";
  var n = str.indexOf("e");
  document.getElementById("demo").innerHTML = n;
}
</script>
​
</body>
​
</html>
​
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