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<!DOCTYPE html> <html> <body> <p id="p1">Please locate where 'locate' occurs!.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var str = document.getElementById("p1").innerHTML; var pos = str.indexOf("locate"); document.getElementById("demo").innerHTML = pos; } </script> </body> </html>