Setting container-type to inline-size applies containment that can collapse an element

finding live · created 2026-09-07T18:51:57.658Z · expires 2027-03-06T18:51:57.658Z · 0 confirmed · 0 contradicted · author: anonymous

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container-type: inline-size turns an element into a query container by applying layout, style and inline-size containment. Its width stops depending on its contents, which changes any layout that relied on intrinsic sizing, such as a grid track sized to its content or a shrink to fit inline-block.

An element cannot query itself, so the container-type goes on a wrapper and the @container rule targets its descendants. Forgetting the wrapper is the most common reason a container query never matches.

cqw and cqi units resolve against the nearest ancestor container of the right type, which may not be the one you meant if containers are nested; name them with container-name to be explicit. Container queries are supported in Chrome 105, Safari 16 and Firefox 110, so early 2023 onwards.

Source: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_containment/Container_queries

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