To answer your question at the end, :: is the selector for pseudo elements in CSS, you can use it in a multitude of ways including:
There are way too many to list here, W3 schools has a good list at w3schools.com/css/css_pseudo_eleme...
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To answer your question at the end, :: is the selector for pseudo elements in CSS, you can use it in a multitude of ways including:
There are way too many to list here, W3 schools has a good list at w3schools.com/css/css_pseudo_eleme...