Focus tracking (DECSET 1004)

Category: modes · Tags: DEC Private Modes, Xterm Extensions · Specification ↗

DECSET 1004 enables focus in/out event reporting. The sequence is ESC [ ? 1004 h. When the terminal window gains focus, it sends ESC [ I; when it loses focus, it sends ESC [ O. Applications use this to pause animations, dim the UI, or refresh data when the user returns to the window.

Supported by 6 of 6 backends (100%)

Support Matrix

Backend	Version	Support	Notes
Alacritty	0.26.0	✓ yes
Ghostty	1.3.1	✓ yes
Kitty	0.40.0	✓ yes
vt100	0.1.0	✓ yes
WezTerm	0.1.0-fork.5	✓ yes
xterm.js	5.5.0	✓ yes

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