[Javascript] event delegation order

[Anthony Ettinger]

I'm reading through PPK's article at:

http://www.quirksmode.org/js/events_order.html


Near the bottom, there is an explanation of currentTarget with 2 event
handlers registered...I'm confused here how and why clicking on
element2 would trigger the event handler twice.

Here is an excerpt:

------------------------------------
| document                         |
|   ---------------  ------------  |
|   | element1    |  | element2 |  |
|   ---------------  ------------  |
|                                  |
------------------------------------

element1.onclick = doSomething;
element2.onclick = doSomething;
document.onclick = defaultFunction;


.....

But suppose we register these event handlers:

element1.onclick = doSomething;
element2.onclick = doSomething;

If the user clicks on element2 doSomething() is executed twice.


========

WHY is doSomething() called twice from element2 if element1 is a
sibling (not an ancestor/child)?



-- 
Anthony Ettinger
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