Quantity Queries

Category: Link

Using :nth-child (and friends), you can write selectors that target elements when they have a certain number of siblings. So you can write CSS that, for example, styles widgets to be 33.33% wide if there are exactly 3 of them.

The selectors are a bit complicated though, so this tool by Drew Minns is pretty helpful.

And perhaps controversially, a PostCSS plugin for the same.

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Quantity Queries is a post from CSS-Tricks