What are the css pseudo-class selectors? Introduction to structural pseudo-class selectors

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What are the css pseudo-class selectors? Introduction to the structure pseudo-class selector

The structure pseudo-class selector is a pseudo-class selector for the HTML hierarchical "structure". For example, we want the nth child element under a certain parent element.

The above classification is only from the perspective of me writing CSS3 tutorials, but it is not actually the case. However, dividing the structural pseudo-class selectors into three major categories makes it easier for everyone to remember and understand.

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