What is the difference between :before and ::before?

before  811 is the national call-before-you-dig phone number Anyone who plans to dig should call 811 or go to their state 811 center's website before digging to Definition and Usage The ::before selector inserts something before the content of each selected element Use the content property to specify the content to

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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 Sinónimos de BEFORE en inglés: earlier than, ahead of, prior to, in advance of, B4, in front of, ahead of, in advance of, to the fore of, in the presence of