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<body>
<h1>Is the Shift Key Pressed?</h1>
<p>Write som text in the input field, then press down the Shift key and write some more text in the input field:</p>
<input type="text" size="40" onkeydown="myFunction(event)">
<p><strong>Note:</strong> The getModifierState() method is not supported in Safari 10 or IE 8 and earlier versions.</p>
<p id="demo"></p>
<script>
function myFunction(event) {
var x = event.getModifierState("Shift");
document.getElementById("demo").innerHTML = "Pressing the shift key: " + x;
}
</script>
</body>
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