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723Chapter 29 .Event Objects Send event to layerButton2

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 layer1

IE4+ event propagation Event propagation in IE4+ flows in the opposite direction of the NN4 event capture model. IE s model is called event bubbling, in which events bubble upward from the target object through the element containment hierarchy. It s important to distinguish between the old-fashioned document object hierarchy (followed in the NN4 event capture model) and the more modern notion of HTML element containment a concept that carries to the W3C DOM as well. A good way to demonstrate the effect of event bubbling a behavior that is turned on by default is to populate a simple document with lots of event handlers to see which ones fire and in what order. Listing 29-5 has onClickevent handlers defined for a button inside a form, the form itself, and other elements and object all the way up the hierarchy out to the window.
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