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<!DOCTYPE html> <html> <body> <p>This example uses the HTML DOM to assign an "onselect" event to an input element.</p> Select some text: <input type="text" value="Hello world!" id="myText"> <p id="demo"></p> <script> document.getElementById("myText").onselect = function() {myFunction()}; function myFunction() { document.getElementById("demo").innerHTML = "You selected some text!"; } </script> </body> </html>