What is @apply in CSS?

Question

First of all, I am referring to the CSS tag.

I have googled @apply but I couldn\'t find anything that could explain its meaning properly for me.

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Answer 1

@apply is from a proposal that has since been abandoned, and replaced with CSS Shadow Parts.

the @apply rule, which allows an author to store a set of properties in a named variable, then reference them in other style rules.