Why introduce unnecessary complexity, though? You could just as well do 0 20px 20px 0 and have unidirectional flow, or margin-bottom: 20px, or only margin-top: 20px. You're creating problems for yourself that could be avoided altogether.
Because it is not a real world scenario. The whole point of this pattern is to enforce a consistent spacing between members of a container. If one element requires different spacing than others, then your hierarchy of elements is off. I will update article to make this more clear.
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Why introduce unnecessary complexity, though? You could just as well do
0 20px 20px 0and have unidirectional flow, ormargin-bottom: 20px, or onlymargin-top: 20px. You're creating problems for yourself that could be avoided altogether.Because it is not a real world scenario. The whole point of this pattern is to enforce a consistent spacing between members of a container. If one element requires different spacing than others, then your hierarchy of elements is off. I will update article to make this more clear.