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I think this was in referrence to adding "reset.css"[1] as your first css file. It is very "black box," as it is something that you add but never modify. [1]

• code_duck 15y ago
  Wellll.... Meyer says right there "In other words, this is a starting point, not a self-contained black box of no-touchiness.". I understand a lot of people treat it like that, though. I modify the reset to set defaults for each layout myself.