When you access the page, you will see the DOM parent-child relationships 'Parent', 'Child (CHILD)', and 'Grandchild (GRAND CHILD)', of which the first grandchild (orange) is targeted for the event.

Before we get into too much discussion, let’s look at a Hyperscript example that communicates the spirit of the thing: In English, it says: “When the div element is loaded, send an async request to ...