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Xterm Extensions

Extensions introduced by xterm, the reference X Window System terminal emulator, and widely adopted across the ecosystem. These include 256-color and truecolor (24-bit) SGR sequences, the alternate screen buffer with saved cursor, mouse tracking modes (X10, normal, button-event, any-event), focus events, OSC 8 hyperlinks, and OSC 52 clipboard access. Most modern terminals implement xterm extensions as a de facto standard.

16 features in this category

Support Matrix

FeatureGhosttyWezTermAlacrittyvt100xterm.jsKitty
256-color fg (SGR 38;5)
256-color bg (SGR 48;5)
24-bit fg (SGR 38;2)
24-bit bg (SGR 48;2)
Enter alt screen (DECSET 1049)
Exit alt screen (DECRST 1049)
Bracketed paste (DECSET 2004)
Mouse tracking (DECSET 1000)
Focus tracking (DECSET 1004)
Scrollback accumulates
Total line count
Alt screen separate scrollback
Hyperlinks (OSC 8)
Window title (OSC 2)
Text reflow on resize
24-bit truecolor

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