En CSS, :before vs ::before, lequel est correct ?

ACCEDER AU SITE
1085
En CSS, :before vs ::before, lequel est correct ?

::before vs :before | CSS-Tricks

Note the double-colon ::before versus the single-colon :before. Which one is correct? Technically, the correct answer is ::before. But that doesn't mean
Popularité de cette veille
?

1085

Source : css-tricks.com