Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to display the current click count of the clicked button.</p>

<button onclick="myFunction(event)">Click count:</button>

<input id="myInput" type="text">

<script>
function myFunction(event) {
    var x = event.detail;
    document.getElementById("myInput").value = x;
}
</script>

</body>
</html>