Positioning & Stacking

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1. 1 Compare `static`, `relative`, `absolute`, `fixed`, and `sticky` positioning. Easy
2. 2 What is a containing block, and how does `position: absolute` choose its ancestor? Medium
3. 3 How does `position: sticky` decide when to stick, and name two things that silently break it. Medium
4. 4 What creates a new stacking context, and why does that matter for `z-index`? Medium
5. 5 Why can a higher `z-index` still render behind a lower one? Medium
6. 6 How do you center an element both horizontally and vertically — give three different techniques. Medium
7. 7 Why does `transform` on a parent break `position: fixed` children? Hard