Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>This example demonstrates how to assign an "onselect" event to an input element.</p>

Select some text: <input type="text" value="Hello world!" onselect="myFunction()">

<p id="demo"></p>

<script>
function myFunction() {
    document.getElementById("demo").innerHTML = "You selected some text!";
}
</script>

</body>
</html>