2045656 - box-decoration-break inserts borders between contiguous bidi fragments

Status: NEW

(Core :: Layout: Block and Inline, defect, P3)

Description

[psychpsyo]

Attachment: bidi-nonsense.html

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.0

Steps to reproduce:

CSS Writing Modes, (in https://drafts.csswg.org/css-writing-modes/#bidi-fragmentation ) states that "an inline box is not considered to be broken into multiple box fragments due to bidi reordering if no intervening content would force it to split."
Firefox generally honors this, but fails to do so once box-decoration-break is set to "clone", inserting borders between what would've otherwise been one contiguous fragment. (the outer span in the attached repro)

Comment 1

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Core::DOM: Navigation' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Alice0775 White]

Regression window:
https://hg-edge.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=7e8fac17305a&tochange=c6adaead7adf

Bug 1006326 - Enable the 'box-decoration-break' CSS property by default

So, it seems to be not a regression. The problem seems to be in the implementation.