Appearance
Overline (SGR 53)
ESC [ 53 mSGR 53 draws a line above the text, the mirror image of underline. The sequence is
ESC [ 53 m. Reset with SGR 55. Overline is one of the lesser-used ECMA-48 attributes and was adopted by modern terminals relatively recently. It can be useful for horizontal rules, header decoration, or combined with underline for a boxed text effect.How this is testedautomated
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\x1b[53mX, check for overline property on the cell.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 12 tested terminals — universal adoption. Part of the Modern TUI baseline.
Supported by 14 of 14 backends (100%)
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 |