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App cursor keys (DECCKM)
ESC [ ? 1 hDECCKM changes the escape sequences generated by arrow keys. Enable with
ESC [ ? 1 h. In normal mode, arrow keys send CSI sequences (ESC [ A); in application mode, they send SS3 sequences (ESC O A). Full-screen applications typically enable application cursor mode to get unambiguous key input.How this is testedautomated
Send
Send
\x1b[?1h (DECCKM), verify applicationCursor mode is active.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 all 12 tested terminals — universal adoption. Part of the Modern TUI baseline.
Supported by 14 of 14 backends (100%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | DECRPM: mode reset |
| Ghostty | 1.3.1 | ✓ yes | DECRPM: mode reset |
| VS Code | ✓ yes | ||
| Warp | ✓ yes | ||
| Cursor | ✓ yes | ||
| Terminal.app | ✓ yes |