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

Feature	Ghostty	WezTerm	Alacritty	vt100	xterm.js	Kitty
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	✓	✓	✓	✓	✓	✓

← Back to matrix