DOM & Events

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1. 1 What's the difference between event capturing, targeting, and bubbling? Easy
2. 2 What is event delegation and why is it efficient for large or dynamic lists? Medium
3. 3 What's the difference between `stopPropagation`, `stopImmediatePropagation`, and `preventDefault`? Medium
4. 4 What's the difference between `target` and `currentTarget` on an event? Medium
5. 5 How do passive event listeners improve scroll performance? Medium
6. 6 What are the performance costs of `innerHTML` vs `createElement` vs `DocumentFragment`? Medium
7. 7 How do `MutationObserver`, `IntersectionObserver`, and `ResizeObserver` differ and when do you use each? Hard