ungoogled-software/ungoogled-chromium

Add a new flag that allows users to override system prefers-reduced-motion setting

Open

#3786 opened on May 19, 2026

View on GitHub
 (0 comments) (0 reactions) (0 assignees)Python (18,674 stars) (771 forks)batch import
enhancementhelp wanted

Description

Description

Add a new flag that allows users to override system prefers-reduced-motion setting

Who's implementing?

  • I'm willing to implement this feature myself

The problem

If Animations are disabled in Windows settings or Reduce Motion is enabled in macOS settings, there is no way to keep animations in Chromium.

Possible solutions

Add a new flag that allows users to override system prefers-reduced-motion setting, like Firefox's "ui.prefersReducedMotion".

Alternatives

No response

Additional context

These command line flags exist: --force-prefers-reduced-motion --force-prefers-no-reduced-motion But they will not work when right click - open with ...

Contributor guide

Tech stack
cpppython
Domain
accessibility
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic C++Chromium build systemfamiliarity with command line flags
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate how Chromium handles the prefers reduced motion preference, particularly the existing command line flags like force prefers reduced motion. Look at Chrome's flag registration system (e.g., chrome/browser/flag descriptions.cc) and add a new flag similar to Firefox's ui.prefersReducedMotion. Ensure the flag overrides both system settings and existing flags. Check for any relevant code in chrome/browser/renderer preferences util.cc or similar files that map preferences to Blink settings.