The :not(X) property in CSS is a negation pseudo class and accepts a simple selector as an argument. Essentially, its just another selector of any kind. :not matches an element that is not represented ...
header :has(h1.header.chapter) { margin-top: 10px; } header :has(h1.header) { margin-top: 10px; } header :has(h1) { margin-top: 10px; } header :has(.header) { margin ...
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