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Firefox 150: absolute elements in multi-column containers and printing#43772

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pepelsbey:fragmentainer-aware-positioning
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Firefox 150: absolute elements in multi-column containers and printing#43772
pepelsbey wants to merge 1 commit intomdn:mainfrom
pepelsbey:fragmentainer-aware-positioning

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Description

Adds release note for absolutely positioned elements in multi-column containers and printing

Motivation

@pepelsbey pepelsbey requested a review from a team as a code owner April 13, 2026 15:39
@pepelsbey pepelsbey requested review from dipikabh and removed request for a team April 13, 2026 15:39
@github-actions github-actions bot added Content:Firefox Content in the Mozilla/Firefox subtree size/xs [PR only] 0-5 LoC changed labels Apr 13, 2026
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github-actions bot commented Apr 13, 2026

Preview URLs (2 pages)

External URLs (2)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox


URL: /en-US/docs/Mozilla/Firefox/Releases/150
Title: Firefox 150 release notes for developers (Beta)

(comment last updated: 2026-04-13 15:47:50)

@pepelsbey pepelsbey force-pushed the fragmentainer-aware-positioning branch from 0bf47b4 to 870ad6f Compare April 13, 2026 15:43
@github-actions github-actions bot added size/s [PR only] 6-50 LoC changed and removed size/xs [PR only] 0-5 LoC changed labels Apr 13, 2026
@pepelsbey pepelsbey force-pushed the fragmentainer-aware-positioning branch from 870ad6f to bd145ba Compare April 13, 2026 15:46
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Looks good, just a few nits for your consider.
Thanks Vadim!


### Absolutely positioned elements in multi-column containers and printing

Firefox now correctly positions and fragments absolutely positioned elements inside [multi-column containers](/en-US/docs/Web/CSS/Guides/Multicol_layout) and when printing.
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this is fine but if we want consistency with other entries and drop "Firefox" as the subject, we could rephrase it as

"Absolutely positioned elements inside multi-column containers and when printing are now correctly positioned and fragmented."

| Release | 150 | No |

- `layout.abspos.fragmentainer-aware-positioning.enabled`
- : Set to `true` to enable.
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or similar to other entries where the feature is already enabled:

Suggested change
- : Set to `true` to enable.
- : Set to `true` to enable. (already enabled in Nightly)

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.

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

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I believe it's not Nightly-only, meaning that it will be available in stable 150 behind the flag.

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Ah ok, then no need to add "(Nightly)"

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

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3 participants