Appearance
Dotted underline (SGR 4:4)
ESC [ 4:4 mSGR 4:4 draws a dotted underline beneath text:
ESC [ 4:4 m. Part of the Kitty extended underline styles. Can be combined with SGR 58 for colored underlines. Reset with SGR 24.How this is tested: Send
\x1b[4:4mX, verify underline === "dotted".Analysis2026-03-26
Supported by all 8 tested terminals — universal adoption. Part of the Modern TUI baseline.
Supported by 12 of 13 backends (92%)
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 | |
| tmux | 3.6a | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | |
| Terminal.app | 2.15 | ✓ yes | |
| GNU Screen | 5.0.1 | ✓ yes |