::before and ::after
Widely available since 2018-01-29
The ::before and ::after CSS pseudo-elements select inline boxes preceding and following an element. They are often used with the content property to generate cosmetic content.
Learning resources on MDN
Browser support (view on caniuse.com)
- Chrome 1 Released on 2008-12-11
- Chrome Android 18 Released on 2012-06-27
- Edge 12 Released on 2015-07-29
- Firefox 1.5 Released on 2005-11-29
- Firefox for Android 4 Released on 2011-03-29
- Safari 4 Released on 2009-06-08
- Safari on iOS 3.2 Released on 2010-04-03