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urxvt Mouse Reporting (1015)
urxvt-style mouse reporting (mode 1015) uses decimal encoding for coordinates, extending reporting beyond the 223-column limit of traditional X10 encoding. Less common than SGR mouse (1006) but still supported by some terminals.
How this is testedautomated
Enable urxvt mouse mode (
Enable urxvt mouse mode (
CSI ? 1015 h), check getMode("mouseTracking") returns true. Verifies the backend recognizes this specific mouse encoding.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 9 of 14 backends (64%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| 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 |
|---|---|---|---|
| vterm | 0.2.0 | ✓ yes | |
| Alacritty | 0.26.0 | ✗ no | urxvt mouse mode (?1015) not implemented |
| Kitty | 0.40.0 | ✗ no | urxvt mouse mode (?1015) not implemented in kitty |
| vt100.js | 0.2.1 | ✗ no | urxvt mouse mode (?1015) not implemented |
| WezTerm | 0.1.0-fork.5 | ✗ no | urxvt mouse mode (?1015) not implemented |
| xterm.js | 5.5.0 | ✗ no | urxvt mouse mode (?1015) not implemented |