What is the difference between capturing and bubbling?
PICTURE THIS: 1, 2, 2, 8
Simple meaning
Listeners can run on the way down from window to the target, then on the way up.
WHY — DOM instead of guessing?
Why interviewers care about DOM:
contrast on DOM, not two memorised paragraphs.
the developer, then one case where picking wrong hurts.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Listeners can run on
the way down from window to the target, then on the way up.
- 2AddEventListener's third argument true
means capture.
- 3React 17+ delegates mostly
to the root, but the mental model still helps when mixing jQuery-style code.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
Listeners can run on the way down from window to the target, then on the way up. AddEventListener's third argument true means capture.