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added release note for Namespaced attributes in attr() #43789

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dletorey merged 7 commits into from
Apr 15, 2026
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added release note for Namespaced attributes in attr() #43789

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c4527fb
added release not for Namespaced attributes in attr()
dletorey Apr 14, 2026
a0e6ee2
Merge branch 'main' into 43556-namespaced-attributes-in-attr-ff-release
dletorey Apr 14, 2026
d90664f
Merge branch 'main' into 43556-namespaced-attributes-in-attr-ff-release
dletorey Apr 15, 2026
10bda58
Update files/en-us/mozilla/firefox/experimental_features/index.md
dletorey Apr 15, 2026
f9eadf5
Update files/en-us/mozilla/firefox/releases/150/index.md
dletorey Apr 15, 2026
491f8ad
Merge branch 'main' into 43556-namespaced-attributes-in-attr-ff-release
dletorey Apr 15, 2026
b0ba030
Merge branch 'main' into 43556-namespaced-attributes-in-attr-ff-release
dletorey Apr 15, 2026
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14 changes: 14 additions & 0 deletions files/en-us/mozilla/firefox/experimental_features/index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -344,6 +344,20 @@ The {{cssxref("attr")}} CSS function now supports [`<attr-type>`](/en-US/docs/We
| Beta | 149 | No |
| Release | 149 | No |

- `layout.css.attr.enabled`
- : Set to `true` to enable.

### Namespaced attributes in `attr()` CSS function

The {{cssxref("attr")}} CSS function now accepts [namespaced attributes](/en-US/docs/Web/CSS/Reference/Values/attr#namespaces). This allows you to take attributes from elements of [XML](/en-US/docs/Web/XML)-based languages, such as [SVG](/en-US/docs/Web/SVG) and style them accordingly. ([Firefox bug 2014060](https://bugzil.la/2014060))

| Release channel | Version added | Enabled by default? |
| ----------------- | ------------- | ------------------- |
| Nightly | 150 | No |
| Developer Edition | 150 | No |
| Beta | 150 | No |
| Release | 150 | No |

- `layout.css.attr.enabled`
- : Set to `true` to enable.

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4 changes: 4 additions & 0 deletions files/en-us/mozilla/firefox/releases/150/index.md
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Expand Up @@ -114,6 +114,10 @@ These features are shipping in Firefox 150 but are disabled by default.
To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`.
You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page.

- **Namespaced attributes in `attr()` CSS function**: `layout.css.attr.enabled`

The {{cssxref("attr")}} CSS function now accepts [namespaced attributes](/en-US/docs/Web/CSS/Reference/Values/attr#namespaces). This allows you to take attributes from elements of [XML](/en-US/docs/Web/XML)-based languages, such as [SVG](/en-US/docs/Web/SVG) and style them accordingly. ([Firefox bug 2014060](https://bugzil.la/2014060))

- **Absolutely positioned elements in multi-column containers and when printing**: `layout.abspos.fragmentainer-aware-positioning.enabled`

Absolutely positioned elements inside [multi-column containers](/en-US/docs/Web/CSS/Guides/Multicol_layout) and when printing are now correctly positioned and fragmented. This improves interoperability with other browsers and prevents layout issues such as overlapping text or content loss. ([Firefox bug 2018797](https://bugzil.la/2018797)).
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