X10 Mouse Tracking (9)

Category: input · Tags: DEC Private Modes

X10 compatibility mouse tracking (mode 9) reports only button press events, not releases or motion. This is the oldest mouse tracking mode, limited to coordinates up to 223 and press-only events.

How this is tested: Enable mode 9 via CSI ? 9 h, verify via DECRPM that the mode is recognized.

Supported by 4 of 12 backends (33%)

Terminal Applications

Terminal	Version	Support	Notes
iTerm2	3.6.9	? unknown
Ghostty	1.3.1	? unknown
cmux	0.62.2	? unknown
Kitty	0.46.2	? unknown
VS Code	1.112.0	? unknown
Warp	0.2026.03.18.08.24.03	? unknown
Cursor	2.6.21	? unknown
Terminal.app	2.15	? unknown

Headless Backends

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

Backend	Version	Support	Notes
Alacritty	0.26.0	✓ yes
vt100	0.2.1	✓ yes
vterm	0.2.0	✓ yes
WezTerm	0.1.0-fork.5	✓ yes

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