Appearance
DECRARA — reverse attrs in rectangle
CSI Pt ; Pl ; Pb ; Pr ; Ps $ tDECRARA (
CSI Pt ; Pl ; Pb ; Pr ; Ps $ t) toggles the listed SGR attributes within a rectangular region. Each cell flips the listed bits — bold cells become non-bold, non-bold cells become bold, and so on. Like DECCARA, it leaves the characters alone and obeys DECSACE to operate on a rectangle or a stream. VT420-era applications used DECRARA to flash highlight a field on validation errors or to invert a selected row in a list.How this is testedautomated
Write text, send
Write text, send
\x1b[1;1;3;5;7$t (toggle inverse on rows 1-3 cols 1-5), verify the sequence is consumed.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 9 tested terminals — universal adoption. Part of the Unicode baseline.
Supported by 8 of 14 backends (57%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | sequence consumed |
| Ghostty | 1.3.1 | ✓ yes | sequence consumed |
| 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 |
|---|---|---|---|
| Alacritty | 0.26.0 | ✗ no | VT420 rectangular area operations not implemented — legacy DEC features omitted by most modern terminals |
| Kitty | 0.40.0 | ✗ no | VT420 rectangular area operations not implemented — legacy DEC features omitted by most modern terminals |
| vt100.js | 0.2.1 | ✗ no | VT420 rectangular area operations not implemented — legacy DEC features omitted by most modern terminals |
| vterm | 0.2.0 | ✗ no | VT420 rectangular area operations not implemented — legacy DEC features omitted by most modern terminals |
| WezTerm | 0.1.0-fork.5 | ✗ no | VT420 rectangular area operations not implemented — legacy DEC features omitted by most modern terminals |
| xterm.js | 5.5.0 | ✗ no | VT420 rectangular area operations not implemented — legacy DEC features omitted by most modern terminals |