The answer
Definition (bottom-up propagation), three phases (capturing, target, bubbling), default is bubbling, stopPropagation vs stopImmediatePropagation, capturing (third arg true), event delegation, and e.target vs e.currentTarget.
Event Bubbling: Complete Guide for Interviews
What should I know about event bubbling for an interview?
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Add one listener on the parent: parent.addEventListener('click', e => { if (e.target.matches('li')) handle(e.target); }). Check e.target to determine which child was clicked. Works for dynamically added children.
Capturing (top-down: document to target's parent), Target (event reaches the target), Bubbling (bottom-up: target to document). Default listeners run in the bubbling phase.
e.target is the element that triggered the event (the actual clicked element). e.currentTarget is the element the listener is registered on. In bubbling, e.target stays the same, e.currentTarget changes as the event bubbles.
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