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[Question] About CSS prefers-color-scheme render in icecat

From: morisum
Subject: [Question] About CSS prefers-color-scheme render in icecat
Date: Tue, 14 Dec 2021 00:31:46 +0000

Hi all,

I tried to use icecat with dark mode; however, the website page won't automatically change to dark mode as expected. To be more specific the "prefers-color-scheme:dark" in CSS ( I tried multiple versions on multiple distros to recreate test this; however, none of it works. 

Here is a list of all the test I did:

guix (icecat 78.10.0-guix0-preview1)

guix (icecat 91.4.0-guix0-preview1)

parabola (78.10.0_pre2-1)

arch (91.40 compiled from source)

arch (78.10 compiled from aur)

ubuntu20.04 (install from

I tried to use the system dark mode settings (for example, in ubuntu), or the adwaita-dark theme, as well as to config the gtk3 directly under ~/.config/gtk-3.0/settings.ini with gtk-application-prefer-dark-theme=1 or gtk-application-prefer-dark-theme=true. I also tried to set ui.systemUsesDarkTheme=1 and other settings in the about:config. But none of those behave as expected.

All the distros are freshly installed; you can use the official qemu image from arch ( or guix ( to recreate this situation. 

Can someone check what the problem is? Would you please let me know if there is anything else I need to provide?
Thanks in advance!


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