Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

Cosmetic filters with multiple selectors and :has are interpreted differently depending on whether the browser has native :has support.

A specific URL where the issue occurs.

docs.rs

Steps to Reproduce

Add this custom filter:

docs.rs##form, .recent-releases-container:has(invalid)

Expected behavior

The filter should ideally be interpreted the same way on Chromium and Firefox.

Intuitively, form (which appears in the page's top navbar) should be hidden. As far as I can tell, the propagation of procedural operators to previously listed selectors is not documented in the wiki.

Actual behavior

The filter causes form to be hidden on Chromium browsers, but nothing is hidden in Firefox.

uBO version

1.46.0

Browser name and version

Firefox 109.0.1, Chromium 109.0.5414.87

Operating System and version

Arch Linux