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<!DOCTYPE html> <html> <body> <p>Click the button to locate the first occurance 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>