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CUD stops at bottom
CUD (Cursor Down, CSI Pn B) should stop at the bottom margin of the scroll region, or the last row if no scroll region is set. Moving down with a count exceeding the remaining rows should clamp to the last row rather than scrolling or wrapping. Unlike a linefeed at the bottom margin, CUD never triggers scrolling — it simply stops.
How this is tested: Position at row 0, send
\x1b[999B (CUD with count 999), verify cursor stopped at the last row.Analysis2026-03-26
Supported by all 5 tested terminals — universal adoption. Part of the Core TUI baseline.
Supported by 11 of 11 backends (100%)
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 | |
| Kitty | 0.46.2 | ✓ yes | |
| Terminal.app | 2.15 | ✓ yes |