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CSS pseudo-elements are used to style specific parts of a document, but are not actual HTML elements. They are specified with a double colon syntax (::) followed by the name of the pseudo-element.
The following are some common pseudo-elements in CSS:
::before - inserts content before the content of an element::after - inserts content after the content of an element::first-letter - styles the first letter of an element::first-line - styles the first line of an element::selection - styles the text that is selected by the user::backdrop - creates a backdrop that can be used for modal dialogs and similar content.Note: CSS pseudo-elements were introduced with a single colon syntax (:) in CSS1 and CSS2, but in CSS3 a double colon syntax was introduced to differentiate them from pseudo-classes.
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