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Есть ли разница?


Aleksey19881988
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Первое — синтаксис CSS1-2, второе — синтаксис CSS3 для псевдоэлементов (чтобы отличать их от псевдоклассов, которые остались с одним двоеточием). Первое считается устаревшим, зато работает в IE8. Второе как бы более модное, но в IE8 не работает.

Насколько я в курсе, это вся разница.

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