The shiftkey mouse event property is used to show whether SHIFT key is pressed or not when mouse button is clicked.
Example
You can try to run the following code to learn how to implement shiftKey Mouse event in JavaScript.
<!DOCTYPE html>
<html>
<body onmousedown = "funcShiftKey(event)">
<div>Press and hold SHIFT key and then click here.</div>
<script>
function funcShiftKey(event) {
if (event.shiftKey) {
alert("SHIFT key: Pressed");
} else {
alert("SHIFT key: NOT Pressed");
}
}
</script>
</body>
</html>