2002115 - Enable layout.abspos.fragmentainer-aware-positioning.enabled on all channels

Status: RESOLVED FIXED

(Core :: Layout: Positioned, task)

Description

[Ting-Yu Lin [:TYLin] (PST, UTC-7)]

This bug enables the preference layout.abspos.fragmentainer-aware-positioning.enabled on all channels. Any bugs that must be fixed before enabling this preference should block this bug.

Comment 1

[Ting-Yu Lin [:TYLin] (PST, UTC-7)]

I’ve added all the bugs that I believe are necessary to enable the pref.

Marking this for triage again, as it blocks fixing other multicol anchor-positioning WPTs in 2026.

Comment 2

[Ting-Yu Lin [:TYLin] (PST, UTC-7)]

Attachment: Bug 2002115 - Enable layout.abspos.fragmentainer-aware-positioning.enabled on all channels.

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/ded57b39aef6
https://hg.mozilla.org/integration/autoland/rev/a617e3c8da51
Enable layout.abspos.fragmentainer-aware-positioning.enabled on all channels. r=dholbert

Comment 7

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/a617e3c8da51

Comment 8

[Ryan VanderMeulen [:RyanVM]]

Did you want to nominate this for the Fx151 relnotes? Please add a relnote-firefox? nomination to the bug if so.

Comment 9

[Ting-Yu Lin [:TYLin] (PST, UTC-7)]

(The Release Note Request is adapted from bug 2018797 comment 5, which was nominated when the pref is enabled on Nightly only. I tweak the "Suggested wording" by s/Firefox 150/Firefox 151/ and s/Firefox Nightly/Firefox.)

Release Note Request (optional, but appreciated)
[Why is this notable]: Enabling the pref addresses incorrect positioning and fragmentation of absolutely positioned elements across multi-column container, improving interoperability with other browsers. It also prevents layout glitches (e.g. overlapping text) or content loss when printing absolutely positioned elements.
[Affects Firefox for Android]: Yes.
[Suggested wording]: Starting with Firefox 151, Firefox improves the rendering of absolutely positioned elements across multi-column containers and in printing, ensuring a more accurate element positioning and fragmentation.
[Links (documentation, blog post, etc)]: N/A

Comment 10

[Donal Meehan [:dmeehan]]

Thanks, added to the Fx151 nightly release notes, please allow 30 minutes for the site to update.
Keeping the relnote-firefox flag as ? to keep it on the radar for inclusion in the final Fx151 release notes.

Comment 12

[Donal Meehan [:dmeehan]]

Added to the final Fx151 release notes