docs: CSS ?inline query parameter (#8050)

Co-authored-by: patak <[email protected]>
Co-authored-by: Bjorn Lu <[email protected]>

docs/guide/features.md

@@ -210,6 +210,15 @@ Vite improves `@import` resolving for Sass and Less so that Vite aliases are als
 
 You can also use CSS modules combined with pre-processors by prepending `.module` to the file extension, for example `style.module.scss`.
 
+### Disabling CSS injection into the page
+
+The automatic injection of CSS contents can be turned off via the `?inline` query parameter. In this case, the processed CSS string is returned as the module's default export as usual, but the styles aren't injected to the page.
+
+```js
+import styles from './foo.css' // will be injected into the page
+import otherStyles from './bar.css?inline' // will not be injected into the page
+```
+
 ## Static Assets
 
 Importing a static asset will return the resolved public URL when it is served: