DOM & Browser

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1. 1 Implement an `EventEmitter` with `on`, `off`, `once`, and `emit`. Medium
2. 2 Implement your own `querySelectorAll` for simple selectors. Hard
3. 3 Implement event delegation for a dynamic list. Medium
4. 4 Implement a function that detects when an element enters the viewport (without IntersectionObserver). Medium
5. 5 Implement a simple client-side router (hash and history API). Hard