Features›Cursor›Cursor up (CUU)

Cursor up (CUU)

Category: cursor · Baseline: core · Tags: ECMA-48 Standard, VT100 · Specification ↗

ESC [ N A

CUU moves the cursor up by N rows without changing the column. The sequence is ESC [ N A (default N=1). The cursor stops at the top margin of the scroll region and does not wrap or scroll.

How this is testedautomated
Move cursor down 5 then up 2 via \x1b[5B\x1b[2A, verify cursor row is 3 (0-based).

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 Core TUI baseline.

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		✗ no
Warp		✗ no
Cursor		✗ no
Terminal.app		✗ no

Headless Backends

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

Backend	Version	Support	Notes
Alacritty	0.26.0	✓ yes
Kitty	0.40.0	✓ yes
vt100.js	0.2.1	✓ yes
vterm	0.2.0	✓ yes
WezTerm	0.1.0-fork.5	✓ yes
xterm.js	5.5.0	✓ yes

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