Features›Device Status›Pop title/icon stack (CSI 23 ; 0 t)

Pop title/icon stack (CSI 23 ; 0 t)

Category: device · Baseline: rich · Tags: Xterm Extensions · Specification ↗

ESC [ 23 ; 0 t

XTWINOPS subcode 23 pops the most recent title and icon label from the internal stack pushed by CSI 22 t. The sequence is CSI 23 ; 0 t (pop both), CSI 23 ; 1 t (pop icon only), or CSI 23 ; 2 t (pop title only). Always paired with a matching CSI 22 t push earlier in the session. Used by long-running TUI applications (vim, tmux, ssh) to restore the original window title on exit. Push/pop is preferred over query/restore (CSI 21 t followed by OSC 2) because it doesn't expose the saved title to user-space processes — many modern terminals refuse to report titles for security but happily maintain a private title stack.

How this is testedautomated
Send \x1b[22;0t followed by \x1b[23;0t, verify both sequences are consumed and the terminal stays responsive.

The same probe runs against headless backends (via Termless) and real terminal apps (via a daemon launched in each terminal). This lets us distinguish parser correctness from rendering correctness.

Analysis2026-04-06

Supported by 8 of 9 terminals (89%). Not supported by: Alacritty. Part of the Rich TUI baseline. Notes: Alacritty: Title stack not implemented by alacritty.

Supported by 11 of 14 backends (79%)

Terminal Applications

Terminal	Version	Support	Notes
iTerm2	3.6.9	✓ yes	Sequence consumed; terminal responsive
Ghostty	1.3.1	✓ yes	Sequence consumed; terminal responsive
VS Code		✓ yes
Warp		✓ yes
Cursor		✓ yes
Terminal.app		✓ yes

Headless Backends

Parser correctness only — a ✓ means the parser accepts the sequence.

Backend	Version	Support	Notes
vt100.js	0.2.1	✓ yes
vterm	0.2.0	✓ yes
xterm.js	5.5.0	✓ yes
Kitty	0.40.0	~ partial	Title stack not exposed via Python batch bridge
WezTerm	0.1.0-fork.5	~ partial	Title stack pop not exposed in headless mode
Alacritty	0.26.0	✗ no	Title stack not implemented by alacritty

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