The :first-child selector is intended, like the name says, to select the first child of a parent tag. The children have to be embedded in the same parent tag. Your exact example will work (Just tried it here ).
The :first-child pseudo-class, introduced in CSS2.1, represents the very first child of its parent. That's it. There's a very common misconception among web developers that it picks up whichever child element is the first to match some other conditions specified in the same compound selector.
Due to the way selectors work, that is simply not true.
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