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<html><body onmousedown="WhichButton(event)" style="border:1px solid black;padding:8px"><h1>Mouse Events</h1><h2>The which Property</h2><p>Click in this page with one of your mouse buttons.</p><p>1 = The left mouse button</p><p>2 = The middle mouse button</p><p>3 = The right mouse button</p><p id="demo"></p><script>function WhichButton(event) { document.getElementById("demo").innerHTML = "You pressed: " + event.which;}</script></body></html>