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Regional indicator flags (2 cols)
Regional Indicator symbols are paired to form flag emoji. For example, 🇺🇸 (US flag) is the sequence U+1F1FA U+1F1F8. A terminal that handles these correctly renders the pair as a single 2-column wide flag glyph.
How this is testedautomated
Write a regional indicator pair (e.g., U+1F1FA U+1F1F8 for US flag), verify it renders as a single 2-column glyph.
Write a regional indicator pair (e.g., U+1F1FA U+1F1F8 for US flag), verify it renders as a single 2-column glyph.
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 9 of 12 terminals (75%). Not supported by: vt100.js, Alacritty, xterm.js. Part of the Unicode baseline. Notes: vt100.js: Emoji flag sequences not rendered as wide characters; Alacritty: Emoji flag sequences not rendered as wide characters; xterm.js: Emoji flag sequences not rendered as wide characters.
Supported by 10 of 14 backends (71%)
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 | |
| WezTerm | 0.1.0-fork.5 | ✓ yes | |
| Alacritty | 0.26.0 | ✗ no | Emoji flag sequences not rendered as wide characters |
| vt100.js | 0.2.1 | ✗ no | Emoji flag sequences not rendered as wide characters |
| xterm.js | 5.5.0 | ✗ no | Emoji flag sequences not rendered as wide characters |