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Set normal font (OSC 710)
ESC ] 710 ; font BELOSC 710 sets the terminal's normal (regular weight) font. The sequence is
ESC ] 710 ; font BEL where font is an X11 logical font description (XLFD) or a fontconfig pattern. rxvt-unicode introduced a family of font-setting OSCs with different roles: OSC 711 for the bold font, OSC 712 for italic, and OSC 713 for bold-italic. Together they let applications swap the entire font set on the fly. Outside of urxvt this protocol is essentially unused — modern terminals tie font selection to user preferences and do not expose font swapping over escape sequences.How this is testedpartial
Send
Send
OSC 710 ; fixed BEL and verify the terminal consumes the sequence (cursor position unchanged).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 4 tested terminals — universal adoption. Part of the Unicode baseline.
Supported by 6 of 14 backends (43%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| Terminal.app | 2.15 | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | |
| VS Code | 1.113.0 | ? unknown | |
| Warp | 0.2026.03.18.08.24.03 | ? unknown | |
| Cursor | 2.6.21 | ? unknown |