The altkey attribute is used to display whether the SHIFT key was pressed when the key event was triggered.
You can try running the following code to learn how to implement the shiftKey property in JavaScript.
<!DOCTYPE html>
<html>
<body>
<input type = "text" onkeydown = "funcShiftKey(event)">
<div id = "res">Press any key</div>
<script>
function funcShiftKey(event) {
var val = document.getElementById("res");
if (event.shiftKey) {
val.innerHTML = "SHIFT key: Pressed";
} else {
val.innerHTML = "SHIFT key: NOT Pressed";
}
}
</script>
</body>
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