Event Bubbling (Firefox)
<html> <head> <title>Event Bubbling</title> <script type="text/javascript"> function mouseDown(nsEvent) { var theEvent = nsEvent ? nsEvent : window.event; var locString = "X = " + theEvent.screenX + " Y = " + theEvent.screenY; var theSrc = theEvent.target ? theEvent.target : theEvent.srcElement; document.write(locString + " " + theSrc); } document.onmousedown=function (evnt) { var theEvnt = evnt? evnt : window.event; document.write(theEvnt.type); } window.onload=function () { document.getElementById("first").onmousedown=mouseDown; document.getElementById("second").onmousedown=function () { document.write("Second event handler"); } } </script> </head> <body> <div id="first" style="padding: 20px; background-color: #ffff0; width: 150px"> <div id="second" style="background-color: #ff0000; width: 100px; height: 100px"></div> </div> </body> </html>