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Ff145 Release note for CSS module scripts #41654

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Oct 31, 2025
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Ff145 Release note for CSS module scripts #41654

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2545d37
FF145 Relnote/Expr: CSS Module Scripts
hamishwillee Oct 24, 2025
7dbef9a
Update files/en-us/mozilla/firefox/experimental_features/index.md
hamishwillee Oct 31, 2025
7e9753b
Merge branch 'main' into ff145relnote_css_import_attribute
hamishwillee Oct 31, 2025
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16 changes: 15 additions & 1 deletion files/en-us/mozilla/firefox/experimental_features/index.md
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Expand Up @@ -370,7 +370,21 @@ The CSS `text-decoration-trim` property allows you to specify {{cssxref("text-de

## JavaScript

**No experimental features in this release cycle.**
### CSS module scripts

CSS module scripts are now supported, allowing a stylesheet to be loaded into a script as a {{domxref("CSSStyleSheet")}} instance using the [`import`](/en-US/docs/Web/JavaScript/Reference/Statements/import) statement.
The `import` statement must also specify the `type` [import attribute](/en-US/docs/Web/JavaScript/Reference/Statements/import/with) and set it to `"css"`, and the stylesheet must be served with the [media type](/en-US/docs/Web/HTTP/Guides/MIME_types) of `text/css`.
([Firefox bug 1720570](https://bugzil.la/1720570)).

| Release channel | Version added | Enabled by default? |
| ----------------- | ------------- | ------------------- |
| Nightly | 145 | No |
| Developer Edition | No | No |
| Beta | No | No |
| Release | No | No |

- `layout.css.module-scripts.enabled`
- : Set to `true` to enable.

## APIs

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4 changes: 4 additions & 0 deletions files/en-us/mozilla/firefox/releases/145/index.md
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Expand Up @@ -113,6 +113,10 @@ You can find more such features on the [Experimental features](/en-US/docs/Mozil
The anchor-positioned elements can then have their size and position set relative to the size and location of the anchor elements to which they are bound.
(General: [Firefox bug 1988224](https://bugzil.la/1988224), `position-area`: [Firefox bug 1924086](https://bugzil.la/1924086)).

- **CSS module scripts:** (Nightly) and `layout.css.module-scripts.enabled`.

CSS module scripts are now supported, allowing a stylesheet to be loaded into a script as a {{domxref("CSSStyleSheet")}} instance using the [`import`](/en-US/docs/Web/JavaScript/Reference/Statements/import) keyword and the [`type` import attribute](/en-US/docs/Web/JavaScript/Reference/Statements/import/with) set to `type="css"`. ([Firefox bug 1720570](https://bugzil.la/1720570)).

- **text-decoration-trim**: `layout.css.text-decoration-trim.enabled`

The CSS `text-decoration-trim` property is supported but currently disabled by default.
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