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<html><body><p>Use 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>