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Document @container-size utility #2482

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8ecf13f
add `@container-size` documentation
RobinMalfait May 7, 2026
6c80cfe
make distinction between `@container` and `@container-size` more clear
RobinMalfait May 7, 2026
b0e5613
fix highlighting bug
RobinMalfait May 7, 2026
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25 changes: 22 additions & 3 deletions src/docs/responsive-design.mdx
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Expand Up @@ -383,7 +383,7 @@ Learn more about arbitrary value support in the [arbitrary values](/docs/adding-

### Basic example

Use the `@container` class to mark an element as a container, then use variants like `@sm` and `@md` to style child elements based on the size of the container:
Use the `@container` class to mark an element as an inline-size container, then use variants like `@sm` and `@md` to style child elements based on the size of the container:

```html
<!-- [!code filename:HTML] -->
Expand Down Expand Up @@ -444,6 +444,23 @@ For complex designs that use multiple nested containers, you can name containers

This makes it possible to style something based on the size of a distant container, rather than just the nearest container.

### Using size containers

Use `@container-size` to mark an element as a size container instead of an inline-size container when you need to use container query length units that depend on the block size, like `cqb`:

```html
<!-- [!code filename:HTML] -->
<!-- [!code word:@container-size] -->
<!-- [!code word:h-\[50cqb\]] -->
<div class="@container-size">
<div class="h-[50cqb]">
<!-- ... -->
</div>
</div>
```

You can also name size containers using `@container-size/{name}`.

### Using custom container sizes

Use the `--container-*` theme variables to customize your container sizes:
Expand Down Expand Up @@ -491,18 +508,20 @@ Use variants like `@min-[475px]` and `@max-[960px]` for one-off container query

### Using container query units

Use [container query length units](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_containment/Container_queries#container_query_length_units) like `cqw` as arbitrary values in other utility classes to reference the container size:
Use [container query length units](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_containment/Container_queries#container_query_length_units) like `cqw` and `cqi` as arbitrary values in other utility classes to reference the container size:

```html
<!-- [!code filename:HTML] -->
<!-- [!code word:w-\[50cqw\] -->
<!-- [!code word:w-\[50cqw\]] -->
<div class="@container">
<div class="w-[50cqw]">
<!-- ... -->
</div>
</div>
```

For units that need more than the inline size, like `cqb` and `cqh`, use `@container-size` to make the full size of the container available.

### Container size reference

By default, Tailwind includes container sizes ranging from 16rem _(256px)_ to 80rem _(1280px)_:
Expand Down