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CSS quantity queries use pseudo-selectors like :nth-last-child() and :first-child to style elements based on the number of siblings in a container. This technique allows layouts to automatically adapt when items are added or removed—navigation menus can switch from horizontal to vertical, photo grids can adjust column counts, and shopping carts can change from spacious to compact views. The approach requires no JavaScript and works by combining selectors to detect specific item counts or ranges, enabling content-aware responsive design that goes beyond traditional media queries.

CSS Quantity Queries: The Technique Top 1% Developers Use But Never Talk About

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CSS Quantity Queries: The Technique That Helps You Become 1% Better as a Developer. Your CSS Can Do This? (Most Developers Have No Idea)

CSS Quantity Queries: The Technique That Helps You Become 1% Better as a Developer. Your CSS Can Do This? (Most Developers Have No Idea)

I would consider myself a pretty good frontend dev, especially CSS and i only use these very occasionally. I think the title of the post is clickbaity.
The thing with these is that they are based on children which is really annoying if you introduce inbetween elements (Tooltips for example) or if you introduce absolutely positioned elements somewhere.
Also you cannot say “first div” with :first-child and so on, but rather you can only say “div, that is also a first child”, which is something very different.