W3School TIY Editor
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<html> <head> <script type="text/javascript"> function isKeyPressed(event) { if (event.metaKey==1) { alert("The meta key was pressed!") } else { alert("The meta key was NOT pressed!") } } </script> </head> <body onmousedown="isKeyPressed(event)"> <p>Click somewhere in the document. An alert box will tell you if you pressed the meta key or not.</p> </body> </html>