The ::before and ::after pseudo-elements in CSS allows you to insert content onto a page without it needing to be in the HTML. While the end result is not actually in the DOM, it appears on the page as if it is, and would essentially be like this:
When reading CSS code, we sometimes see code using :before and other times with ::before (same for ::after). Is there a difference between the 2 notations? Is one correct? A bit of history In CSS2, the syntax used at the time was :before. This was confusing because CSS also had selectors like :hover, but they both had different semantic meanings. So in Selectors Level 3, they decided to change ...
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In CSS, ::before creates a pseudo-element that is the first child of the selected element. It is often used to add cosmetic content to an element with the content property. It is inline by default.