<!DOCTYPE html>
<html lang="en-US">
<body onkeydown="myFunction(event)">
<p>Click on this page once and press metaKey</p>
<p>In Windows OS 'Window' button is a metakey</p>
<p>In Mac OS 'cmd(⌘)' button is a metakey</p>
<script>
function myFunction(e){
if(e.metaKey)
alert("metaKey was Pressed");
else
alert("metaKey was not Pressed");
}
</script> </body>
</html>