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This PR allows modifying utility output by wrapping all utility
declarations in a custom selector or marking all utility declarations as
`!important`. This is the v4 equivalent to the `important` option in the
`tailwind.config.js` file.
## Mark all utility declarations as `!important`
To add `!important` to all utility declarations, you add an `important`
flag after the `@import` statement for `tailwindcss` or
`tailwindcss/utilities`:
```css
/** Importing `tailwindcss` */
@import "tailwindcss" important;
/** Importing the utilities directly */
@import "tailwindcss/utilities" important;
```
Example utility output:
```css
.mx-auto {
margin-left: auto !important;
margin-right: auto !important;
}
.text-center {
text-align: center !important;
}
```
This is equivalent to adding `important: true` to the
`tailwind.config.js` file — which is still supported for backwards
compatibility.
## Wrap all utility declarations in a custom selector
To nest all utilities in an `#app` selector you add `selector(#app)`
flag after the `@import` statement for `tailwindcss` or
`tailwindcss/utilities`:
```css
/** Importing `tailwindcss` */
@import "tailwindcss" selector(#app);
/** Importing the utilities directly */
@import "tailwindcss/utilities" selector(#app);
```
Example utility output:
```css
.mx-auto {
#app & {
margin-left: auto;
margin-right: auto;
}
}
.text-center {
#app & {
text-align: center;
}
}
```
This is equivalent to adding `important: "#app"` to the
`tailwind.config.js` file — which is still supported for backwards
compatibility.
**This _does not_ bring back support for the `respectImportant` flag in
`addUtilities` / `matchUtilities`.**
A utility-first CSS framework for rapidly building custom user interfaces.
Documentation
For full documentation, visit tailwindcss.com.
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