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The Composite Extension of the X Window System renders the graphical output of clients "...to an off-screen buffer. Applications can then take the contents of that buffer and do whatever they like. The off-screen buffer can be automatically merged into the parent window or merged by external programs, called compositing managers."

This enabled the creation of compositing managers for X, capable of effects like transparency, 3D rotation, and jiggly windows.

The composite extension was added to X.org in version X11R6.8 in September 2004.

References

1. "Software/CompositeExt". 2008-08-23.
2. "Summary of new features in X11R6.8". Retrieved 2010-01-02.
3. "PR: X.Org Foundation Announces X11R6.8 Release of the X Window System". 2004-09-09. Archived from the original on 2015-05-16. Retrieved 2011-01-02.

v t e X Window System
Architecture	Core protocol X Window selection X Window authorization X11 color names X Input Method Wayland
Extensions	X Image Extension X keyboard extension RandR X Rendering Extension Shape extension Shared memory extension X Display Manager Control Protocol X video extension X-Video Motion Compensation AIGLX GLX Multi-Pointer X Display PostScript Composite Extension Xinerama
Components and notable implementations	Display servers X.Org Server Cygwin/X X-Win32 X386 XFree86 XDarwin Xming Xsgi Xsun Xgl Xephyr XQuartz XWayland Client libraries Xlib XCB X Toolkit Intrinsics Display managers Session managers GDM KDM SDDM XDM LightDM LXDM Entrance WDM Window managers (comparison) Compositing Compiz KWin Metacity Mutter Xfwm Enlightenment Stacking 4Dwm AfterStep amiwm Blackbox CTWM cwm Fluxbox FLWM FVWM IceWM Matchbox mwm olwm Openbox Qvwm Sawfish swm tvtwm twm vtwm WindowLab Window Maker wm2 Tiling awesome dwm i3 Ion ratpoison wmii xmonad StumpWM larswm
Standards	ICCCM EWMH XDS freedesktop.org
Applications	xcalc xclock xedit xload xterm xeyes Desktop environments (comparison)

• X Window extensions