This HTML page demonstrates the JavaScript 1.2 event system.
To demonstrate this page, click on the link below. This will
take you to the John Wiley & Sons Publishing web site after
signalling that the event was handled by the window.
Press the back button on your browser to return to this page
and press the "Press Me" button. You will see that both the window
and the button receive the event. Now, click on the link again. A
new window event handler has taken over, and it will prevent you from
using any click events on the page.
Wiley's Web site