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<!DOCTYPE html> <html> <body> <p>Modify the text in the input field, then click outside the field to fire the onchange event.</p> Enter some text: <input type="text" name="txt" value="Hello" onchange="myFunction(this.value)"> <script> function myFunction(val) { alert("The input value has changed. The new value is: " + val); } </script> </body> </html>