Features›SGR (Text Styling)›Standard fg colors (SGR 30-37)

Standard fg colors (SGR 30-37)

Category: sgr · Baseline: core · Tags: ECMA-48 Standard · Specification ↗

ESC [ 30–37 m

SGR 30-37 set the foreground text color to one of 8 standard colors: black (30), red (31), green (32), yellow (33), blue (34), magenta (35), cyan (36), white (37). Universally supported. The actual displayed color depends on the terminal's color scheme — "red" in one theme may look very different from "red" in another.

How this is testedautomated
Send \x1b[31mX (red), verify the cell's foreground color has a red channel > 100.

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 11 of 12 terminals (92%). Not supported by: vt100.js. Part of the Core TUI baseline. Notes: vt100.js: Standard foreground colors (SGR 30–37) not implemented in vt100.js baseline emulator.

Supported by 11 of 14 backends (79%)

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
Kitty	0.40.0	✓ yes
vterm	0.2.0	✓ yes
xterm.js	5.5.0	✓ yes
Alacritty	0.26.0	~ partial	Backend returns palette index instead of resolved RGB
WezTerm	0.1.0-fork.5	~ partial	Backend returns palette index instead of resolved RGB
vt100.js	0.2.1	✗ no	Standard foreground colors (SGR 30–37) not implemented in vt100.js baseline emulator

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