GTK

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GTK
[[Programmer|Original authorTemplate:Pluralize from text]]Spencer Kimball, Peter Mattis
[[Programmer|DeveloperTemplate:Pluralize from text]]The GNOME Project, eXperimental Computing Facility (XCF)
Initial releaseApril 14, 1998; 28 years ago (1998-04-14)
Template:Infobox software/simple
Written inC, CSS[1]
EnginePage Template:Plainlist/styles.css has no content.
Template:EditAtWikidata
Operating systemLinux and Unix-like; partial support for macOS and Windows
TypeWidget toolkit
LicenseLGPLv2.1+
Websitegtk.org
RepositoryPage Template:Plainlist/styles.css has no content.

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GTK (formerly GIMP ToolKit[2] and GTK+[3]) is a free open-source widget toolkit for creating graphical user interfaces (GUIs)[4] targeted at Linux and specifically GNOME (though with some use in other desktop environments). It is licensed under the terms of the GNU LGPL, allowing both free and proprietary software to use it.[5]

The GTK team releases new versions on a regular basis.[6] GTK 4 and GTK 3 are actively maintained, while GTK 2 is no longer supported.[7] GTK 1 is independently maintained by the CinePaint project.[8]

Software architecture

The GTK toolkit
Simplified software architecture of GTK. Pango, GDK, ATK, GIO, Cairo and GLib
GDK contains back-ends to X11, Wayland, Broadway (HTTP), Quartz, and GDI and relies on Cairo for the rendering. Its new SceneGraph is work-in-progress.

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The GTK library contains a set of graphical control elements (widgets); version 3.22.16 contains 186 active and 36 deprecated widgets.[9] GTK is an object-oriented widget toolkit written in the programming language C; it uses GObject (that is, the GLib object system) for object orientation. While GTK is mainly used with windowing systems based on Wayland (and prior to that on Wayland's predecessor X11), it works on other platforms, including Microsoft Windows (interfaced with the Windows API), and macOS (interfaced with Quartz). There is also an HTML5 back-end named Broadway, although this was deprecated in 2025 with the X11 backend to indicate both would be removed in GTK version 5.[10][11][12] GTK uses Vulkan or GL to draw most graphical elements.[13]

GTK can be configured to change the look of the widgets drawn with its CSS engine. CSS can be used both at the system/user level, for all applications, and set by the application.

GTK Drawing Kit (GDK)

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GDK acts as a wrapper around the low-level functions provided by the underlying windowing and graphics systems.

GTK Scene Graph Kit (GSK)

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GSK is the rendering and scene graph API for GTK. GSK lies between the graphical control elements (widgets) and the rendering. GSK was finally merged into GTK version 3.90 released March 2017.

GtkBuilder

GtkBuilder allows user interfaces to be designed without writing code. The interface is described in an Extensible Markup Language (XML) file which is written by hand or generated by a GUI designer, which is then loaded at runtime and the objects created automatically. The description of the user interface is independent from the programming language being used.

Language bindings

Template:Main article

Language bindings are available for using GTK from languages other than C, including C++, Genie, JavaScript, Perl, Python, Vala, and others.[14]

Backends

GTK supports various backends, which provides different ways to display GTK applications depending on the system and environment. Examples of GTK backends are:

  • Wayland – Used with the Wayland display server on some Unix-like systems, it is a modern replacement for X11.
  • X11 – The default on Unix-like systems using the X.Org display server.
  • Win32 – For running GTK applications on Windows.
  • Quartz – For macOS support.
  • Broadway – Allows GTK applications to run in web browsers using HTML5 and WebSocket.[10][11]

Development tools

GUI designers

A screenshot of Cambalache Interface Designer

There are several GUI designers for GTK. Here is a selection of GTK GUI designers:

GTK Inspector

A screenshot of the GTK Inspector

The GTK Inspector is a built-in interactive debugging tool in GTK, allowing developers to inspect and modify UI elements, test CSS changes, and analyze widget structure in real time. It can be enabled using the Control + Shift + I or Control + Shift + D shortcuts, or by setting the GTK_DEBUG=interactive environment variable.[19] It was introduced with GTK version 3.14.[20][21]

Features

  • Interactive debugging
  • Real-time CSS testing and modifications
  • Widget magnification for detailed inspection
  • UI structure analysis and object property examination
  • Customizable display settings via environment variables
  • Detailed object inspection (type, state, properties, CSS, actions, etc.)
  • Global application information display
  • CSS rule debugging
  • Rendering pipeline recording and inspection

Development

GTK is mainly developed by The GNOME Project, which also develops the GNOME Development Platform and the GNOME Desktop Environment.[22] GTK is mainly written in C.[23] Many language bindings are available.

GNOME developers and users gather at an annual GNOME Users And Developers European Conference GUADEC meeting to discuss GNOME's current state and future direction.[24] GNOME incorporates standards and programs from freedesktop.org to better interoperate with other desktops.[citation needed]

Many GNOME applications have been ported to GTK 4, which was released in December 2020,[25] however some still use GTK+ 3 (GIMP being a major one).

Build automation

The master branch of GTK utilizes Meson for its build automation. GTK (and GNOME, GLib, etc.) formerly utilized the GNU Build System (named Autotools) as the build automation system of choice. Since August 14, 2017, the Autotools build system files have been dropped.[26]

Criticism

The most common criticism of GTK is the lack of backward-compatibility in major updates, most notably in the application programming interface (API)[27] and theming.[28] The result is that application developers or theme developers have to rewrite parts of their code to make it work with a newer version of GTK.

The compatibility breaks between minor releases during the GTK 3.x development cycle was explained in 2013 by Benjamin Otte as due to strong pressures to innovate, such as providing the features modern users expect and supporting the increasingly influential Wayland display server protocol. With the release of GTK 4, the pressure from the need to innovate will have been released and the balance between stability and innovation will tip toward stability.[29] Similarly, recent changes to theming are specifically intended to improve and stabilise that part of the API, meaning some investment now should be rewarded later.[citation needed] However, in 2025, GTK 5 is described in the official documentation as "a major new version of GTK that breaks both API and ABI compared to GTK 4.x.", like GTK 3 and 4.[30][31][32]

  • Aurélien Gâteau started Gwenview as an GTK application but switched to Qt early in development.[33]
  • Dirk Hohndel, codeveloper of Subsurface and member of Intel's Open-Source Technology Center, criticized the GTK developers for being abrasive and ignoring most community requests.[34]
  • Hong Jen Yee, the creator of LXDE, expressed disdain for the GTK3 toolkit's radical breaking API changes and increased memory usage, leading him to port the project to Qt, renaming it LXQt.[35]
  • The Audacious music player moved to Qt in version 3.6.[36] The reasons stated by the developers for this include a transition to client-side window decorations, which they claim cause the application to look "GNOME-y and out of place."[37]
  • Wireshark has switched to Qt due to not having a good experience with GTK's cross-platform support.[38]
  • EasyEffects, a popular audio equalizer, is being ported to Qt.[39]

Use

GTK's support for Wayland requires applications to be adapted to Wayland as well.
Screenshot of GIMP 2.8 – GTK is responsible for managing the interface components of the program, including the menus, buttons, and input fields.

Applications

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Some notable applications that use GTK as a widget toolkit include:

GTK programs can be run on desktop environments based on X11 and Wayland, or others including ones not made with GTK, provided the needed libraries are installed; this includes macOS if X11.app is installed. GTK can be also run on Microsoft Windows. It is used by some popular cross-platform applications like Pidgin and GIMP. wxWidgets, a cross-platform GUI toolkit, uses GTK on Linux by default.[41] Other ports include DirectFB (for example used by the Debian installer).

Desktop environments

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Several desktop environments utilize GTK as the widget toolkit.

Current

Inactive

Window managers

The following window managers use GTK:

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GtkSourceView

For syntax highlighting there is GtkSourceView, "source code editing widget". GtkSourceView is maintained by GNOME separately from GTK as a library: gtksourceview. There are plans to rename to gsv.[citation needed]

GtkSpell

GtkSpell is a library separate from GTK. GtkSpell depends on GTK and Enchant. Enchant is a wrapper for ispell, hunspell, etc., the actual spell checker engine/software. GtkSpell uses GTK's GtkTextView widget, to highlight misspelled words and offer replacement.

History

GTK was originally designed and used in the GNU Image Manipulation Program (GIMP) as a replacement of the Motif toolkit; at some point Peter Mattis became disenchanted with Motif and began to write his own GUI toolkit named the GIMP toolkit and had successfully replaced Motif by the 0.60 release of GIMP.[42] Finally GTK was re-written to be object-oriented and was renamed GTK+.[43] This was first used in the 0.99 release of GIMP. GTK was subsequently adopted for maintenance by the GNOME Foundation, which uses it in the GNOME desktop environment.

GTK 2

The GTK 2.0.0 release (2002[44]) series introduced new features which include improved text rendering using Pango, a new theme engine, improved accessibility using the Accessibility Toolkit, transition to Unicode using UTF-8 strings, and a more flexible API. Starting with version 2.8, released in 2005, GTK 2 depends on the Cairo graphics library for rendering vector graphics.[45]

GTK 3

GTK version 3.0.0 (2011[46]) included revised input device handling, support for themes written with CSS-like syntax, and the ability to receive information about other opened GTK applications. All rendering was done using Cairo.[47]

The '+' was dropped returning to simply 'GTK' in February 2019 during a Hackathon.[48]

GTK 4

Release of the first GTK 4 version was in December 2020. At the 2018 edition of DevConf.cz, Matthias Clasen gave an overview of the then-current state of GTK 4 development, including a high-level explanation of how rendering and input worked in GTK 3, what changes were being made to GTK 4, and the reasons for those changes. Examples of things that have become possible with GTK 4 were given as well.[49]

One of the main changes made during the GTK 4 development cycle (i.e. GTK 3.92, etc.) was the removal of user customization options (like individual keyboard shortcuts that could be set in GTK+ 2), and the delegation of functionality to ancillary objects instead of encoding it into the base classes provided by GTK. Other changes include:

  • Event handling from signal handlers described by GtkWidget is delegated to event controllers.
  • Rendering is delegated to GtkSnapshot objects.
  • The layout mechanism is delegated from GtkWidget to GtkLayoutManager.
  • Cairo was de-emphasized and Vulkan or GL were used instead to draw most graphical elements.[13]

Releases

Release series Initial release Major enhancements Latest minor version
Unsupported: 1.0Page Template:Version/styles.css has no content. 1998-04-13[50] First stable version 1.0.
Unsupported: 1.2Page Template:Version/styles.css has no content. 1999-02-25[51] New widgets:
  • GtkFontSelector
  • GtkPacker
  • GtkItemFactory
  • GtkCTree
  • GtkInvisible
  • GtkCalendar
  • GtkLayout
  • GtkPlug
  • GtkSocket
 1.2.10
Unsupported: 2.0Page Template:Version/styles.css has no content. 2002-03-11[52] GObject

Overall support for UTF-8

2.0.9
Unsupported: 2.2Page Template:Version/styles.css has no content. 2002-12-22[53] Multihead support 2.2.4
Unsupported: 2.4Page Template:Version/styles.css has no content. 2004-03-16[54] New widgets:
  • GtkFileChooser
  • GtkComboBox
  • GtkComboBoxEntry
  • GtkExpander
  • GtkFontButton
  • GtkColorButton
 2.4.14
Unsupported: 2.6Page Template:Version/styles.css has no content. 2004-12-16[55] New widgets:
  • GtkIconView
  • GtkAboutDialog
  • GtkCellView

The last to support Windows 98/Me

2.6.10
Unsupported: 2.8Page Template:Version/styles.css has no content. 2005-08-13[56] Most widgets are rendered by Cairo 2.8.20
Unsupported: 2.10Page Template:Version/styles.css has no content. 2006-07-03[57] New widgets:
  • GtkStatusIcon
  • GtkAssistant
  • GtkLinkButton
  • GtkRecentChooser

Print support: GtkPrintOperation

2.10.14
Unsupported: 2.12Page Template:Version/styles.css has no content. 2007-09-14[58] GtkBuilder 2.12.12
Unsupported: 2.14Page Template:Version/styles.css has no content. 2008-09-04[59] JPEG 2000 load support 2.14.7
Unsupported: 2.16Page Template:Version/styles.css has no content. 2009-03-13[60] New widget: GtkOrientable

Caps Lock warning in password entry

Improvements on GtkScale, GtkStatusIcon, GtkFileChooser

2.16.6
Unsupported: 2.18Page Template:Version/styles.css has no content. 2009-09-23[61] New widget: GtkInfoBar

Improvement on file chooser, printing

To remove much of the necessary IPC between the X11 application and the X11 server, GDK is rewritten (mainly by Alexander Larsson) to use "client-side windows", i.e., the GdkWindow, which every widget must have, belongs now to the client

2.18.9
Unsupported: 2.20Page Template:Version/styles.css has no content. 2010-03-23[62] New widgets:
  • GtkSpinner
  • GtkToolPalette
  • GtkOffscreenWindow

Improvement on file chooser, keyboard handling, GDK

Introspection data is now included in GTK

2.20.1
Unsupported: 2.22Page Template:Version/styles.css has no content. 2010-09-23[63] GdkPixbuf moved to separate module

Most GDK drawing are based on Cairo

Many internal data are now private and can be sealed in preparation to GTK 3

2.22.1
Unsupported: 2.24Page Template:Version/styles.css has no content. 2011-01-30[64] New widget: GtkComboBoxText which had previously been a custom widget shipped with Gtkmm

The CUPS print backend can send print jobs as PDF

GtkBuilder has gained support for text tags and menu toolbuttons and many introspection annotation fixes were added

Migrating from GTK+ 2.x to GTK+ 3

2.24.33
(2020-12-21)[65]
Unsupported: 3.0Page Template:Version/styles.css has no content. 2011-02-10[66] Development and design of the GTK 3 release of the toolkit started in February 2009 during the GTK Theming Hackfest held in Dublin[67]
  • The first draft of the development roadmap was released on April 9, 2009[68]

Completed mostly Project Ridley

  • the attempt to consolidate several libraries that were external to GTK+
  • including libgnome, libgnomeui, libgnomeprint22, libgnomeprintui22, libglade, libgnomecanvas, libegg, libeel, gtkglext, and libsexy[69]

All the rendering is done using Cairo

GDK became more X11 agnostic

XInput2, theme API is based on Cascading Style Sheets (CSS), worsening the achievable performance for 60 Hz frame rates

3.0.12
Unsupported: 3.2Page Template:Version/styles.css has no content. 2011-09-25[70] New widgets:
  • GtkLockButton
  • GtkOverlay

New Font Chooser dialog

New experimental backends:

3.2.4
Unsupported: 3.4Page Template:Version/styles.css has no content. 2012-03-26[71] Menu support in GtkApplication

A new color chooser

Added support for touch devices

Added support for smooth scrolling

GtkScrolledWindow will do kinetic scrolling with touch devices

macOS support is improved

This is the first version of GTK 3 that works well on Windows

The Wayland backend is updated to the current Wayland version

Spin buttons have received a new look

Accessibility: the treeview accessible support is rewritten

More complete CSS theming support

3.4.4
Unsupported: 3.6Page Template:Version/styles.css has no content. 2012-09-24[72] New widgets:
  • GtkSearchEntry
  • GtkMenuButton
  • GtkLevelBar

Vertical spin buttons

CSS animations, blur shadows

Support for cross-fading and transitions in themes

3.6.5
Unsupported: 3.8Page Template:Version/styles.css has no content. 2013-03-25[73] Wayland 1.0 stable support

Support for the broadwayd server

Improved theming

Better geometry management

Touch improvements

Support with the window manager for the frame synchronization protocol

GdkFrameClock added[74]

3.8.9
Unsupported: 3.10Page Template:Version/styles.css has no content. 2013-09-23[75] New widgets:
  • GtkHeaderBar
  • GtkPlacesSidebar
  • GtkStack
  • GtkStackSwitcher
  • GtkRevealer
  • GtkSearchBar
  • GtkListBox

Support for Wayland 1.2

  • maximization
  • animated cursors
  • multiple monitors
  • settings
  • custom surfaces
  • frame synchronization

Added:

  • client-side decorations
  • scaled output support on high-dpi screens
  • fine-adjustment mode for scrolling

Removed:

  • support for the Motif DND protocol
  • support for multiple screens per display
  • gdk_window_get_display
  • gtk_widget_push_composite_child

Tear-off menu-items, plus many GTK settings

The modern GTK drawing model

3.10.9
Unsupported: 3.12Page Template:Version/styles.css has no content. 2014-03-25[76] Client-side decorations[77]

Support for Wayland 1.5

New widget: GtkPopover (an alternative to menus and dialogs)

3.12.2
Unsupported: 3.14Page Template:Version/styles.css has no content. 2014-09-22[78] GtkInspector (a copy of gtkparasite) introduced[79][80]

Improved support for gestures/multi-touch merged[81][82]

Deprecated:[83]

  • GtkMisc
  • GtkAlignment
  • GtkArrow
  • GdkColor
  • Style regions
  • support for .icon files
  • gdk_window_flush
  • drawing outside of begin/end paint

Most widgets converted to use gestures internally

Wayland supports GNOME Shell classic mode[84]

3.14.15
Unsupported: 3.16Page Template:Version/styles.css has no content. 2015-03-22[85] GDK supports rendering windows using OpenGL for X11 and Wayland using libepoxy

New widgets:

  • GtkGLArea
  • GtkStackSidebar
  • GtkModelButton
  • GtkPopoverMenu

Scrolling overhauled (scrollbar hidden by default[86])

Experimental Mir backend[87]

3.16.7
Unsupported: 3.18Page Template:Version/styles.css has no content. 2015-09-23[88] Add CSS node infrastructure

More filechooser design refresh and better filechooser search

Dropped Windows XP support

Model support for list and flow box

Kinetic touchpad scrolling

Touchpad gestures (Wayland)

gtk-builder-tool utility

Output-only windows

3.18.9
Unsupported: 3.20Page Template:Version/styles.css has no content. 2016-03-21[89] Further Integration of CSS nodes[90]

Move drag and drop down to GDK

New widget: GtkShortcutsWindow (shows keyboard shortcuts and gestures of an application)

3.20.10
Unsupported: 3.22Page Template:Version/styles.css has no content. 2016-09-21[91] Last 3.x release[92]

Wayland tablet support is merged,[93] support for graphics tablets is considered feature complete[94]

GTK 3.22 shall be as rock-stable (and hence "boring") as GTK 2[29][95][96]

for 3+ years
3.22.29
Supported: 3.24Page Template:Version/styles.css has no content. 2018-09-03[97] 3.22 was supposed to be the last version of GTK 3 series
  • 3.24 was mainly released to ease migrating from GTK+ 3.x to GTK+ 4

Dependency bumps – require:

  • libepoxy 1.4
  • pango 1.41

New font chooser features:

  • allow setting OpenType font features
  • show examples for OpenType font features
  • allow selecting OpenType font variations
  • support levels of details for selection

New Emoji features:

  • support a completion popup for Emoji
  • drop Ctrl-Shift-e shortcut

Other new APIs: gdk_window_move_to_rect

Wayland: use anonymous shared memory on FreeBSD

Backported event controllers from GTK 4:

  • GtkEventControllerScroll
  • GtkEventControllerMotion
  • GtkEventControllerKey
  • GtkGestureStylus

Deprecate a few APIs that are gone in GTK 4:

  • focus chains in GtkContainer
  • stepper sensitivity in GtkRange
 3.23.0
3.23.1
3.23.2
3.23.3
3.24.0
...3.24.5
3.24.14
...

3.24.51

Unsupported: 3.90Page Template:Version/styles.css has no content. 2017-03-31[98] GTK Scene Graph Kit (GSK) merged[6]

Remove any API marked as deprecated

Heavy development

A new Vulkan-renderer augments the old Cairo-renderer[99]

3.89.1

3.89.2
3.89.4
3.89.5
3.90

Unsupported: 3.92Page Template:Version/styles.css has no content. 2017-10-18[100][101] As GNOME 3.26 was released already on September 13, 2017,[102] it was not based on GTK 3.92.

GNU autotools was replaced with Meson.

3.91.0

3.91.1
3.91.2
3.92.1

Unsupported: 3.94Page Template:Version/styles.css has no content. 2018-06-26[103] 3.93
  • GdkScreen, GdkVisual removed
  • GdkDeviceManager replaced by GdkSeat
  • Clipboard handling is moved from GTK to GDK
  • GdkEvent is converted to an opaque GObject
  • the GL renderer in GSK is substantially completed, and is now on par with the Vulkan renderer
  • the use of GdkPixbuf in APIs is reduced
    • and the GskTexture object is moved to GDK as GdkTexture, to take its place
  • the Wayland backend now implements the KDE server-side decoration protocol
  • Broadway is ported to GSK.

GdkWindow renamed to GdkSurface

New abstraction for drawable content: GdkPaintable

There is support for displaying media with:

  • GtkVideo
  • GtkMediaFile
  • GtkMediaStream
  • GtkMediaControls
 3.93
3.94.0
Unsupported: 3.96Page Template:Version/styles.css has no content. 2019-05-07[104] The Page Template:Mono/styles.css has no content.gtk4-builder-tool Page Template:Kbd/styles.css has no content.simplify command has gained a Page Template:Kbd/styles.css has no content.--3to4 option to convert GTK3 ui files to GTK4; though with AMTK menus, toolbars or other objects like GtkShortcutsWindow are created programmatically (not with a *.ui file), but with convenient APIs.[105]

GtkWidget can now use a GtkLayoutManager for size allocation

  • layout managers can optionally use layout children holding layout properties
  • GtkBinLayout, GtkBoxLayout, GtkGridLayout, GtkFixedLayout and GtkCustomLayout are currently available
  • more layout manager implementations will appear in the future

Focus handling has been rewritten, and focus-change event generation has been unified with crossing events

Events have been simplified and are just used for input:

  • expose events have been replaced by a GdkSurface::render signal
  • configure events have been replaced by a GdkSurface::size-changed signal
  • map events have been replaced by a GdkSurface::mapped property
  • gdk_event_handler_set has been replaced by a GdkSurface::event signal
  • key events no longer contain a string
  • events on unmapped widgets are ignored
 3.93
3.94.0
Unsupported: 3.98Page Template:Version/styles.css has no content. 2020-02-10[104]
  • Performance improvements
  • Drag and drop refactoring
  • Moving GDK towards Wayland
  • Removals
    • GtkMenu, GtkToolbar and similar classes have been replaced by GMenu.
  • Additions
    • Emoji chooser
    • Text widgets now have undo stacks
    • A new layout manager[106]
 3.96.0
Unsupported: 3.99.0Page Template:Version/styles.css has no content. 2020-07-31[107]
  • Introduced successor to Accessibility Toolkit (ATK).[108] The new approach will implement WAI-ARIA (World Wide Web Consortium (W3C) Accessibility Initiative – Accessible Rich Internet Applications).
  • Updated headers to use standard C types instead of GLib types
  • New widgets
  • Fixes and improvements[107]
 3.99.4
Unsupported: 4.0Page Template:Version/styles.css has no content. 2020-12-16[109] 4.0.3
Unsupported: 4.2Page Template:Version/styles.css has no content. 2021-03-30[110] 4.2.1
Unsupported: 4.4Page Template:Version/styles.css has no content. 2021-08-23[111] 4.4.1
Unsupported: 4.6Page Template:Version/styles.css has no content. 2021-12-30[112] 4.6.9
Unsupported: 4.8Page Template:Version/styles.css has no content. 2022-09-06[113] 4.8.3
Unsupported: 4.10Page Template:Version/styles.css has no content. 2023-03-04[114] GtkFileChooser deprecated (use GtkFileDialog)[115] 4.10.5
Unsupported: 4.12Page Template:Version/styles.css has no content. 2023-08-05[116] 4.12.5
Unsupported: 4.14Page Template:Version/styles.css has no content. 2024-03-12[117] 4.14.6
Unsupported: 4.16Page Template:Version/styles.css has no content. 2024-06-09[118] 4.16.12
Unsupported: 4.18Page Template:Version/styles.css has no content. 2025-03-14[119] 4.18.6
Unsupported: 4.19Page Template:Version/styles.css has no content. 2025-04-06[120] 4.19.4
Unsupported: 4.20Page Template:Version/styles.css has no content. 2025-08-29[121] 4.20.2
Unsupported: 4.21Page Template:Version/styles.css has no content. 2025-09-29[122] 4.21.0
4.21.1
Latest version: 4.22Page Template:Version/styles.css has no content. 2026-03-06[123]
Legend:
Unsupported
Supported
Latest version
Preview version
Future version
Page Template:Version/styles.css has no content.

See also

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References

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