File: onkeydown.html

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<!DOCTYPE html>
<html>
<body>

<p>A function is triggered when the user is pressing a key in the input field.</p>

<form action="/">
<input type="text" onkeydown="myFunction(event)">
<input type="submit">
</form>

<script>
function myFunction(event) {
  alert("You pressed a key inside the input field " + event.keyCode);
}
</script>

</body>
</html>