W3Schools 在线编辑工具（TIY） V3.0
编辑的代码:
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<html> <head> <script type="text/javascript"> function getEventType(event) { alert(event.bubbles); } </script> </head> <body onmousedown="getEventType(event)"> <p>Click somewhere in the document. An alert box will tell if the event is a bubbling event.</p> </body> </html>