Pseudo-element selector: The effect of a pseudo-element can be achieved by adding an actual element. There are the following four pseudo-element selectors in CSS:
:first- line: is the first line of text of an element. Use styles;
· :first-letter: Use styles for the first letter or first word of text in an element;
· :before: Insert some content before an element;
· :after: Insert some content after an element;
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