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X10 Mouse Tracking (9)
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 X10 mouse mode (
CSI ? 9 h), check getMode("mouseTracking") returns true.Analysis2026-03-26
Supported by all 8 tested terminals — universal adoption. Part of the Modern TUI baseline.
Supported by 10 of 13 backends (77%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | 1.112.0 | ✓ yes | |
| Warp | 0.2026.03.18.08.24.03 | ✓ yes | |
| Cursor | 2.6.21 | ✓ yes | |
| tmux | 3.6a | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | X10 mouse mode (?9) not implemented |
| Terminal.app | 2.15 | ✓ yes | |
| GNU Screen | 5.0.1 | ✓ yes |
Headless Backends
Parser correctness only — a ✓ means the parser accepts the sequence.
| Backend | Version | Support | Notes |
|---|---|---|---|
| vterm | 0.2.0 | ✓ yes | X10 mouse mode (?9) not implemented |
| Alacritty | 0.26.0 | ✗ no | X10 mouse mode (?9) not implemented |
| vt100 | 0.2.1 | ✗ no | X10 mouse mode (?9) not implemented |
| WezTerm | 0.1.0-fork.5 | ✗ no | X10 mouse mode (?9) not implemented |