Use the onkeyup attribute. The onkeyup attribute fires when the user releases the key.
You can try running the following code to execute the script when the key is released -
<!DOCTYPE html>
<html>
<body>
<p>Press a key inside the textbox.</p>
<input type = "text" onkeydown = "display()">
<script>
function display() {
alert("You released a key!");
}
</script>
</body>
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