Origin mode (DECOM)

Category: modes · Tags: DEC Private Modes, VT100 · Specification ↗

DECOM (Origin Mode) changes how cursor positioning works relative to scroll margins. Enable with ESC [ ? 6 h. When active, cursor coordinates are relative to the scroll region rather than the entire screen, and the cursor is confined within the scroll region boundaries. Used by applications that operate within scroll regions to simplify coordinate calculations.

Supported by 5 of 6 backends (83%)

Support Matrix

Backend	Version	Support	Notes
Alacritty	0.26.0	✓ yes
Ghostty	1.3.1	✓ yes
vt100	0.1.0	✓ yes
WezTerm	0.1.0-fork.5	✓ yes
xterm.js	5.5.0	✓ yes
Kitty	0.40.0	~ partial	Not exposed via Python batch bridge

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