Clicking in the blue box will pop up a "Hello World!" alert window. Clicking on the first link will take you to the YUI website; clicking on the second link, which has the same href attribute, will pop up an alert instead and not navigate to a new page.
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Event Utility is used here to do two things:
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Attach the click event handler to the blue box;
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Attach an event handler to the second <a> element that uses preventDefault() to prevent the link, when clicked, from navigating to a new page.