Chrome is experimenting with @container, a property within the CSS Working Group Containment Level 3 spec being championed by Miriam Suzanne of Oddbird,

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Chrome is experimenting with @container, a property within the CSS Working Group Containment Level 3 spec. @container brings us the ability to style elements based on the size of their parent container. The @container API is not stable, and is subject to syntax changes. If you try it out on your own, you may encounter a few bugs.

Next Gen CSS: @container

Container queries will be the single biggest change in web styling since CSS3, altering our perspective of what “responsive design” means.