X.Org	GNOME / Mutter	KWindowSystem (KWin / LXQt)		wlroots (Sway / Wayfire / Phoc / etc.)		Mir (MATE)	Enlightenment	Arcan
		KWin	any	Sway (IPC)	any
- ICCCM
WM_STATE taskbars, docks, wmctrl, xdotool, etc.	xdg-shell / Window.[un]minimize526	KWin::Toplevel::minimized28	xdg-shell / KDE plasma-window-management15	xdg-shell / wlr-foreign-toplevel-management15		xdg-shell5	xdg-shell / org.enlightenment.wm.Window.Iconify5
- EWMH (NetWM)
_NET_SUPPORTED
_NET_CLIENT_LIST wmctrl, rofi, devilspie, xwinmosaic, taskbars, docks, etc.	/org/gnome/shell/Introspect / WorkspaceManager.get_workspace_by_index & Workspace.list_windows1726	KDE plasma-window-management1		GET_TREE	wlr-foreign-toplevel-management1		org.enlightenment.wm.Window.List
	atspi_get_desktop8
_NET_CLIENT_LIST_STACKING
_NET_NUMBER_OF_DESKTOPS	WorkspaceManager.get_n_workspaces26	KWin::WorkspaceWrapper::desktops28		GET_WORKSPACES			org.enlightenment.wm.Desktop.GetVirtualCount
	atspi_get_desktop_count8
_NET_DESKTOP_GEOMETRY		KWin::WorkspaceWrapper::desktopGridSize28		GET_WORKSPACES22
	atspi_component_get_size8
_NET_DESKTOP_VIEWPORT	Workspace.get_display2226			GET_WORKSPACES22
_NET_CURRENT_DESKTOP	WorkspaceManager.get_active_workspace_index / Workspace.activate26	KWin::WorkspaceWrapper::currentDesktop28		GET_WORKSPACES / workspace			org.enlightenment.wm.Desktop.Show
_NET_DESKTOP_NAMES	WorkspaceManager.get_workspace_by_index26	KWin::WorkspaceWrapper::desktopName28		GET_WORKSPACES
	atspi_accessible_get_name8
_NET_ACTIVE_WINDOW time trackers, xbrlapi	/org/gnome/shell/Introspect / Window.has_focus / Window.focus1726	KWin:WorkspaceWrapper::activeClient28		GET_TREE / focus			org.enlightenment.wm.Window.Uniconify23
_NET_WORKAREA	Window.get_work_area_*26			GET_WORKSPACES
	atspi_component_get_size8
_NET_SUPPORTING_WM_CHECK
_NET_VIRTUAL_ROOTS
_NET_DESKTOP_LAYOUT	WorkspaceManager.override_workspace_layout26
_NET_SHOWING_DESKTOP	WorkspaceManager.showing-desktop-changed2226
_NET_CLOSE_WINDOW	xdg-shell / Window.kill526	KWin::Toplevel::closeWindow28	xdg-shell / KDE plasma-window-management15	kill16	xdg-shell / wlr-foreign-toplevel-management15	xdg-shell5	xdg-shell / org.enlightenment.wm.Window.Close5
_NET_MOVERESIZE_WINDOW panels, fixed-size windows, popups, Win32 apps	xdg-shell / Window.move_resize_frame5626	xdg-shell / KDE plasma-shell 5611		move / resize	xdg-shell / wlr-foreign-toplevel-management / wlr-layer-shell 156	xdg-shell56	xdg-shell56
_NET_WM_MOVERESIZE	xdg-shell5	xdg-shell5		xdg-shell5		xdg-shell5	xdg-shell5
_NET_RESTACK_WINDOW
_NET_REQUEST_FRAME_EXTENTS				GET_TREE
_NET_WM_NAME time trackers, global menus, rofi, xwinmosaic, etc.	xdg-shell / Window.get_title526	KWin::Toplevel::caption28	xdg-shell / KDE plasma-window-management15	xdg-shell / wlr-foreign-toplevel-management15		xdg-shell5	xdg-shell5
_NET_WM_VISIBLE_NAME	xdg-shell / Window.get_title526	xdg-shell5		xdg-shell / wlr-foreign-toplevel-management15		xdg-shell5	xdg-shell5
_NET_WM_ICON_NAME
_NET_WM_VISIBLE_ICON_NAME
_NET_WM_DESKTOP	Window.get_workspace / Window.change_workspace26	KWin::Toplevel::desktop28					org.enlightenment.wm.Window.SendToDesktop23
_NET_WM_WINDOW_TYPE	Window.get_window_type26	KWin::Toplevel::windowType28
_NET_WM_STATE taskbars, docks, wmctrl, xdotool, etc.	xdg-shell5	xdg-shell5		xdg-shell / wlr-foreign-toplevel-management15		xdg-shell5	xdg-shell5
_NET_WM_ALLOWED_ACTIONS	Window.can_* / Window.allows_*26	KWin::Toplevel::*able28
_NET_WM_STRUT panels, docks				wlr-layer-shell5
_NET_WM_STRUT_PARTIAL panels, docks				wlr-layer-shell5
_NET_WM_ICON_GEOMETRY	Window.get_icon_geometry / Window.set_icon_geometry26	KWin::Toplevel::iconGeometry28
_NET_WM_ICON global menus, xwinmosaic, etc.		KDE plasma-window-management1
_NET_WM_PID	Window.get_pid26	KWin::Toplevel::pid28	KDE plasma-window-management1	GET_TREE
_NET_WM_HANDLED_ICONS
_NET_WM_USER_TIME	IdleMonitor / Window.get_user_time2426
_NET_WM_USER_TIME_WINDOW
_NET_FRAME_EXTENTS	Window.get_buffer_rect / Window.get_frame_rect26	KWin::Toplevel::bufferGeometry / KWin::Toplevel::frameGeometry28
_NET_WM_PING	xdg-shell	xdg-shell		xdg-shell		xdg-shell	xdg-shell
_NET_WM_SYNC_REQUEST
_NET_WM_SYNC_REQUEST_COUNTER
_NET_WM_FULLSCREEN_MONITORS
_NET_WM_FULL_PLACEMENT
_NET_WM_WINDOW_TYPE_DESKTOP		KWin::Toplevel::desktopWindow28
_NET_WM_WINDOW_TYPE_DOCK		KWin::Toplevel::dock28
_NET_WM_WINDOW_TYPE_TOOLBAR		KWin::Toplevel::toolbar28
_NET_WM_WINDOW_TYPE_MENU	Window.get_frame_type26	KWin::Toplevel::menu28
_NET_WM_WINDOW_TYPE_UTILITY	Window.get_frame_type26	KWin::Toplevel::utility28
_NET_WM_WINDOW_TYPE_SPLASH		KWin::Toplevel::splash28
_NET_WM_WINDOW_TYPE_DIALOG	Window.get_frame_type26	KWin::Toplevel::dialog28
_NET_WM_WINDOW_TYPE_DROPDOWN_MENU		KWin::Toplevel::dropdownMenu28
_NET_WM_WINDOW_TYPE_POPUP_MENU		KWin::Toplevel::popupMenu28
_NET_WM_WINDOW_TYPE_TOOLTIP		KWin::Toplevel::tooltip28
_NET_WM_WINDOW_TYPE_NOTIFICATION		KWin::Toplevel::notification28
_NET_WM_WINDOW_TYPE_COMBO		KWin::Toplevel::comboBox28
_NET_WM_WINDOW_TYPE_DND		KWin::Toplevel::dndIcon28
_NET_WM_WINDOW_TYPE_NORMAL	Window.get_frame_type26	KWin::Toplevel::normalWindow28
_NET_WM_STATE_MODAL	xdg-shell / Window.get_frame_type52630	KWin::Toplevel::modal2822	xdg-shell5	xdg-shell / wlr-layer-shell 5		xdg-shell5	xdg-shell5
_NET_WM_STATE_FOCUSED							org.enlightenment.wm.Window.Focus23
_NET_WM_STATE_STICKY	Window.is_always_on_all_workspaces / Window.stick26	KWin::Toplevel::onAllDesktops28	KDE plasma-window-management1	GET_TREE / sticky
_NET_WM_STATE_MAXIMIZED_VERT	xdg-shell / Window.get_maximized / Window.[un]maximize526	KWin::Toplevel::clientMaximizedStateChanged / KWin::Toplevel::setMaximize28	xdg-shell / KDE plasma-window-management15	xdg-shell / wlr-foreign-toplevel-management135		xdg-shell5	xdg-shell / org.enlightenment.wm.Window.{M|Unm}aximize35
_NET_WM_STATE_MAXIMIZED_HORZ	xdg-shell / Window.get_maximized / Window.[un]maximize526	KWin::Toplevel::clientMaximizedStateChanged / KWin::Toplevel::setMaximize28	xdg-shell / KDE plasma-window-management15	xdg-shell / wlr-foreign-toplevel-management135		xdg-shell5	xdg-shell / org.enlightenment.wm.Window.{M|Unm}aximize35
_NET_WM_STATE_SHADED	Window.is_shaded / Window.shade26	KWin::Toplevel::shade28	KDE plasma-window-management1
_NET_WM_STATE_SKIP_TASKBAR taskbars themselves, and other shell elements	Window.is_skip_taskbar / WaylandClient.{hide_from|show_in}_window_list2627	KWin::Toplevel::skipTaskbar28	KDE plasma-shell / KDE plasma-window-management111
_NET_WM_STATE_SKIP_PAGER taskbars, and other shell elements	WaylandClient.{hide_from|show_in}_window_list2627	KWin::Toplevel::skipPager28	KDE plasma-shell / KDE plasma-window-management111
_NET_WM_STATE_HIDDEN	/org/gnome/shell/Introspect / Window.is_hidden172226
_NET_WM_STATE_FULLSCREEN	xdg-shell / Window.is_fullscreen / Window.[un]make_fullscreen526	KWin::Toplevel::fullScreen28	xdg-shell / KDE plasma-window-management15	GET_TREE / fullscreen	xdg-shell / wlr-foreign-toplevel-management135	xdg-shell5	xdg-shell5
_NET_WM_STATE_ABOVE	xdg-shell / Window.is_above / Window.[un]make_above526	KWin::Toplevel::keepAbove28	xdg-shell / KDE plasma-shell / KDE plasma-window-management1511	xdg-shell / wlr-layer-shell 5		xdg-shell5	xdg-shell5
_NET_WM_STATE_BELOW		KWin::Toplevel::keepBelow28	KDE plasma-shell / KDE plasma-window-management111	wlr-layer-shell5
_NET_WM_STATE_DEMANDS_ATTENTION IMs, terminal emulators, etc.	xdg-activation / Window.demands_attention / Window.set_demands_attention926	KWin::Toplevel::demandsAttention28	xdg-activation / KDE plasma-window-management19	xdg-activation9
_NET_WM_ACTION_MOVE	Window.allows_move26	KWin::Toplevel::moveable28
_NET_WM_ACTION_RESIZE	Window.allows_resize26	KWin::Toplevel::resizeable28
_NET_WM_ACTION_MINIMIZE	Window.can_minimize26	KWin::Toplevel::minimizable28
_NET_WM_ACTION_SHADE	Window.can_shade26	KWin::Toplevel::shadeable28
_NET_WM_ACTION_STICK
_NET_WM_ACTION_MAXIMIZE_HORZ	Window.can_maximize2629	KWin::Toplevel::maximizable2829
_NET_WM_ACTION_MAXIMIZE_VERT	Window.can_maximize2629	KWin::Toplevel::maximizable2829
_NET_WM_ACTION_FULLSCREEN		KWin::Toplevel::fullScreenable28
_NET_WM_ACTION_CHANGE_DESKTOP
_NET_WM_ACTION_CLOSE	Window.can_close26	KWin::Toplevel::closeable28
_NET_WM_ACTION_ABOVE
_NET_WM_ACTION_BELOW
- XAPP extensions
_NET_WM_XAPP_ICON_NAME
_NET_WM_XAPP_PROGRESS		com.canonical.Unity.LauncherEntry31
_NET_WM_XAPP_PROGRESS_PULSE
- Keyboard
ChangeKeyboardMapping layout switchers	ActivateInputSource3233
- XKB
XkbLockGroup	?	?		?		?	?
- Selections
PRIMARY
SECONDARY
CLIPBOARD
ConvertSelection
Managers				wlr-data-control
- XF86VIDMODE
ModeLine games with strict resolution modes		KDE output-management / KDE outputdevice21
Gamma xbrightness, xgamma, redshift		KDE output-management		wlr-gamma-control
- Grabbing
Pointer games
Button
Keyboard games, screen lockers, password prompts	xwayland-keyboard-grab			wlr-input-inhibitor, wlr-layer-shell45
Key global hotkeys		GlobalShortcuts portal / registerShortcut28	KDE keystate10	bindsym	-
- Queries
Tree
Pointer oneko
Keymap
Font
TextExtents
Colors
BestSize
Extension
- Get
Geometry	/org/gnome/shell/Introspect / Window.get_frame_rect1718192026	KWin::Toplevel::{frameGeometry|size|x|y}281920	KDE plasma-window-management11920	GET_TREE19
- XTEST
GetVersion
CompareCursor
FakeInput xdotool, showkey, remote desktop		KDE fake input		virtual-keyboard / wlr-virtual-pointer
	libinput15
GrabControl
- XEMBED
ReparentWindow tray, gtk_socket plugin for Double Commander, xfce4-panel applets, DAW plugins
	SNI / wl_subcompositor512
EMBEDDED_NOTIFY
	StatusNotifierHostRegistered1213
Window activation
Focus
Modality
Accelerators
- System tray
REQUEST_DOCK tray icons embedding								SEGID_ICON
	StatusNotifierItemRegistered
MESSAGE balloon tooltips from tray icons
	org.freedesktop.Notifications14
- Miscellanous
WM crash persistence	-	wl_display_reconnect2					Session Recovery Extension2	SHMIF
WM decorations	-	server-decoration		server-decoration
XShm (screen capture) screen shooters/capturers, color pickers, screen sharing	PipeWire, portals	KDE screencast (a PipeWire wrapper)		wlr-export-dmabuf / wlr-screencopy
Xinerama		KDE outputdevice		wlr-output-management
DPMS		KDE DPMS		wlr-output-power-management7

---

¹ wlr-foreign-toplevel-management and plasma-window-management support only one client at time. Wanna a compositor-independent taskbar and something like Devilspie simultaneously? fail.
² Requires client support.
³ xdg-shell, plasma-window-management, wlr-foreign-toplevel-management and org.enlightenment.wm.Window.{M|Unm}aximize can’t separately maximize horizontally or vertically.
⁴ wlr-input-inhibitor provides screen locker functionality only (grab prevention), no complete grabbing
⁵ wl_subcompositor, xdg-shell and layer-shell provide access only to own surfaces, or those explicitly obtained via xdg-foreign.
⁶ gnome-shell Meta Window.move[_resize]_frame, xdg-shell and layer-shell provide an agnostic approach that masks the actual output size with anchors.
⁷ wlr-output-power-management provides only on/off modes.
⁸ Only for clients which implement the AT-SPI2 interface.
⁹ xdg-activation is constrained by explicit client-to-client IPC.
¹⁰ KDE keystate is limited to lock keys.
¹¹ KDE plasma-shell is limited to manipulating own surfaces and can be registered only by one client.
¹² SNI replaces a very narrow use of XEmbed for tray icons, provided in a declarative way over DBus. Just an icon, a tooltip, a menu of actions and a scroll event, with the appearance implemented completely by a SNI host. No arbitrary actions over a window, like handling a click position, non-square applets (like in Workrave), etc. Doesn’t really depend on Wayland compositors, as they don’t interfere with the possibility of other apps to become SNI hosts, but the compositors may implement a SNI host themselves.
¹³ StatusNotifierHostRegistered is a rough replacement, as every certain item can’t know if it is drawn by the host, just that the host exists.
¹⁴ Freedesktop Notifications roughly replace balloon messages, as they can in no way be associated with a certain tray icon. To be honest, balloons were scarcely supported by X systray implementations too.
¹⁵ libinput requires either to add the user to the libinput group or to run the client from root: both are even less secure then the X.Org approach. Also, it works on a low level and doesn’t actually have anything to do with Wayland, so things akin to XTestCompareCursorWithWindow and so wouldn’t work.
¹⁶ Sway’s kill command applies only to a currently focused window.
¹⁷ /org/gnome/shell/Introspect is disabled by default in gsettings; read-only access.
¹⁸ /org/gnome/shell/Introspect provides the width/height only.
¹⁹ Window.get_frame_rect, KWin::Toplevel, plasma-window-management and GET_TREE don’t provide the bit depth of a surface.
²⁰ Window.get_frame_rect, KWin::Toplevel and plasma-window-management don’t provide the border width of a surface.
²¹ KDE output management doesn’t handle HSync/VSync, though does handle VRR.
²² Read-only access.
²³ Write-only access.
²⁴ Window-agnostic information.
²⁵ REDACTED
²⁶ Since GNOME 41, WaylandClient, Workspace, WorkspaceManager, IdleMonitor and Window Meta APIs are available only to GNOME Extensions or in the unsafe mode.
²⁷ WaylandClient controls only subprocess surfaces.
²⁸ KWin Scripting API is available only to dedicated registered scripts.
²⁹ Does not inform separately if a window is maximizable only horizontally or only vertically.
³⁰ gnome-shell Meta Window.get_frame_type() is read-only.
³¹ Plasma only.
³² Requires the Agism extension.
³³ Pre-baked input sources only.