# GTK3.24 -\> GTK4.1 Theme migrating hints

**URL:** https://forum.opendesktop.org/t/gtk3-24-gtk4-1-theme-migrating-hints/19486
**Category:** Products
**Created:** [February 13, 2021, 8:21am UTC](https://forum.opendesktop.org/t/gtk3-24-gtk4-1-theme-migrating-hints/19486 "2021-02-13T08:21:29Z")
**Posts on this page:** 4
**Page:** 2

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### Author: ![etiennegnome](https://forum.opendesktop.org/user_avatar/forum.opendesktop.org/etiennegnome/32/46565_2.png) [@etiennegnome](https://forum.opendesktop.org/u/etiennegnome)
#### Post date: [February 23, 2021, 11:42pm UTC](https://forum.opendesktop.org/t/gtk3-24-gtk4-1-theme-migrating-hints/19486/21 "2021-02-23T23:42:43Z")

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Ok. What are implications for non-GTK apps ?  
I’m thinking of Thunderbird or Chrome, for example.

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### Author: ![elbullazul](https://forum.opendesktop.org/user_avatar/forum.opendesktop.org/elbullazul/32/107831_2.png) [@elbullazul](https://forum.opendesktop.org/u/elbullazul)
#### Post date: [February 24, 2021, 12:47am UTC](https://forum.opendesktop.org/t/gtk3-24-gtk4-1-theme-migrating-hints/19486/22 "2021-02-24T00:47:23Z")

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I’m guessing that as long as they handle their own titlebars, nothing would change. I know chromium and firefox can draw their own titlebars, so they wouldn’t be affected if I understand correctly.

@blue-dxca93 are you testing changes with a live OS?

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### Author: ![blue-dxca93](https://forum.opendesktop.org/user_avatar/forum.opendesktop.org/blue-dxca93/32/76530_2.png) [@blue-dxca93](https://forum.opendesktop.org/u/blue-dxca93)
#### Post date: [February 24, 2021, 2:14am UTC](https://forum.opendesktop.org/t/gtk3-24-gtk4-1-theme-migrating-hints/19486/23 "2021-02-24T02:14:32Z")

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@elbullazul  
That is a very interesting the question.  
At the moment firefox and chrome would stay at gtk3.I suppose too and agre with you they should stay the same.

I have installed fedora 34 rawhide nightlies iso in a virtual box. There i can install gtk4-demo and gtk4-devel. My desktop environment is xfce. Caise its small. And i won’t test gnome 40 until its released.

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### Author: ![zeddyzeke](https://forum.opendesktop.org/user_avatar/forum.opendesktop.org/zeddyzeke/32/63533_2.png) [@zeddyzeke](https://forum.opendesktop.org/u/zeddyzeke)
#### Post date: [October 23, 2021, 8:49pm UTC](https://forum.opendesktop.org/t/gtk3-24-gtk4-1-theme-migrating-hints/19486/24 "2021-10-23T20:49:45Z")

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Not sure if this helps or if there’s anything related to themes. I’m noob and I assuming stuff.

> [@](#):
>
> (VirtualBox:43501): Gtk-WARNING \*\*: 21:44:10.351: Theme parsing error: main-dark.css:2470:0: Expected a valid selector

Sorry if it doesn’t help.

Thank you for your work.

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