What does *:before and *:after do in css

เมื่อก่อน อย่าใช้ BEFORE #freeenglish #เก่งอังกฤษกับtiktok #หนังสือค before The ::before and ::after pseudo-elements in CSS allows you to insert content onto a page without it needing to be in the HTML before after The () method inserts a set of Node or string objects in the children list of this Element's parent, just before this Element

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