 nested buttons, with the Level 1 button as the outermost and Level 3 as the innermost. Imagine the user clicks on Level 3: the <code>onclick</code> event will propagate from Level 3 to Level 2, and then from Level 2 to Level 1. All 3 buttons register as clicked.</p>
<p>Now, let's add <code>@onclick:stopPropagation</code> to the Level 2 button. With this change, the propagation goes only from Level 3 to Level 2 and stops there.</p>
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