I spent years Googling “the difference between : and :: in CSS” before the information stayed in my brain. Sound familiar? Then this post is for yo...
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Just to add on,
:beforeand:after,:first-letterand:first-lineare also valid due to their legacy usage, since they were introduced way back before the definition was finalized. But it is highly recommended that for newer code, we should follow proper convention.Thanks! My brain was going in a tizzy thinking about these. Damn, is CSS a mess?!
It is not a mess if you look at the history with a border perspective. The big reason for all these messes is the fact that web was originally designed for documents. Then we sprinkled some dynamic elements on those documents. The current web is more like a platform, with payment api, device api, system api, some that were needed to improve web, some that were added by big corps purely for their own purposes and no relation to web at all. And a primary goal of web is to never break backward compatibility, so even though some things (like definition of psudo-elements and psudo-classes) were needed to change, they had to adopt it to make sure none of the past pages break.
There is an interesting post with CSS working group on their mistake list that they now realize but cannot change until time machine is invented. Do give it a read, you would enjoy it.
Indeed, that’s why I didn’t mention it 😉
And you can combine them 😉
In CSS, ::after creates a pseudo-element that is the last child of the selected element. Right?
No it’s not the last child, because it’s a fake element! 😁
Not only its not the last child - it is not a child at all, but placed in the DOM at the same node level. Meaning that the selected element and its ::after pseudo-element share the same direct parent element.
Thanks. I keep getting them mixed up myself.
No estás solo, me pasa lo mismo.🤣😀🤣
Great article Salma! Simple and right on point💪😊
Thank you!
Gracias excelente articulo. Ahora repetiré en mi cabeza : define una seudo-clase y : : define un seudo-elemento. Listo ya lo tengo.
De nada! 😎
A good rule is
:is for the state of the element itself and::is for a pseudo-element