Different :after and ::after

Difference between :after and ::after

Pseudo-elements were denoted with a single colon in CSS2,
but have been changed in CSS3
"in order to establish a discrimination between
pseudo-classes and pseudo-elements".
For compatibility reasons a single colon is still allowed for the
pseudo-elements defined in CSS 1 and CSS2.

CSS2
The ':before' and ':after' pseudo-elements can be used to
insert generated content before or after an element's content.

CSS3
Pseudo-elements

A pseudo-element is made of two colons (::) followed by
the name of the pseudo-element.

This :: notation is introduced by the current document in order
to establish a discrimination between pseudo-classes and pseudo-elements.
For compatibility with existing style sheets, user agents must also
accept the previous one-colon notation for pseudo-elements introduced in
CSS levels 1 and 2 (namely, :first-line, :first-letter, :before and :after).
This compatibility is not allowed for the new pseudo-elements introduced in
this specification.

Source: stackoverflow.com

Similar codes

0 vote144 views1 answer
Go to top page css
CSS
18 votes152 views2 answers
Hover transition css
CSS
2 votes203 views1 answer
How to override material ui css
CSS
0 vote212 views1 answer
Bash access array indirectly
CSS
52 votes257 views4 answers
Rgba green color
CSS
1 vote242 views2 answers
How to center topnav bar in html
CSS
0 vote252 views2 answers
How to force fully show the keyboard in android
CSS
0 vote192 views2 answers
Css disabled cursor not allowed
CSS
19 votes204 views4 answers
Scss react
CSS
0 vote203 views1 answer
Space between label and input form
CSS