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<!DOCTYPE html> <html> <body> <div onmousedown="WhichButton(event)">Click this text with one of your mouse buttons to return a number. <p> 0 = The left mouse button<br> 1 = The middle mouse button<br> 2 = The right mouse button </p> <p><strong>Note:</strong> Internet Explorer 8, and earlier, returns another result:</p> <p> 1 = The left mouse button<br> 4 = The middle mouse button<br> 2 = The right mouse button </p> </div> <script> function WhichButton(event) { alert("You pressed button: " + event.button) } </script> </body> </html>