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<!DOCTYPE html> <html> <body> <p>Write something in the text field to trigger a function.</p> <input type="text" id="myInput" oninput="myFunction()"> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myInput").value; document.getElementById("demo").innerHTML = "You wrote: " + x; } </script> </body> </html>