<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<body ontouchstart="isKeyPressed(event)">
<h1>The TouchEvent's altKey Property</h1>
<p>Touch somewhere in this document.</p>
<p>An alert box will tell you if the ALT key was pressed when the event occured.</p>
<p><strong>Tip:</strong> Try holding down the ALT key (if your keyboard has one) when you touch the document.</p>
<p><strong>Note:</strong> Many touch devices do not have an ALT key.</p>
<script>
function isKeyPressed(event) {
if (event.altKey) {
alert("The ALT key was pressed!");
} else {
alert("The ALT key was NOT pressed!");
}
}
</script>
</body>
</html>