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::after, ::before, ::first-letter, ::first-line
CSS3 introduced these notations (with two colons) to distinguish pseudo-classes from pseudo-elements. Browsers also accept 
:after
, 
:before
, 
:first-letter
, 
:first-line
, introduced in CSS2
by Valeri Tandilashvili
5 years ago
CSS
pseudo-elements
CSS
1
Pro tip: use ```triple backticks around text``` to write in code fences