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software-design/composition-vs-inheritance-why-a-toy-duck-shouldn-t-learn-to-fly.md
Composition vs inheritance: why a toy duck shouldn't learn to fly
A rubber duck that learns to fly is a classic sign that inheritance, the "is a" way of sharing code, has been stretched too far. Every…
web/why-is-my-css-ignored-specificity-scored-with-three-numbers.md
Why is my CSS ignored? Specificity, scored with three numbers
You write `p { color: red; }`, reload, and the text stays blue. The rule is fine: two rules are competing, and yours lost the contest. The…