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Strikethrough (SGR 9)
ESC [ 9 mSGR 9 draws a horizontal line through the middle of the text. The sequence is
ESC [ 9 m. Used in TUI applications to indicate deleted, deprecated, or completed items. Reset with SGR 29. Widely supported in modern terminals.
Strikethrough is a later text-decoration attribute compared with bold, underline, and inverse video, but modern TUIs use it heavily for completed tasks, deleted text, and diff views. The important compatibility point is cleanup: use SGR 29 rather than SGR 0 when only the strike attribute should end.How this is testedautomated
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\x1b[9mX, verify strikethrough=true 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.
Analysis2026-05-17
Supported by 13 of 14 backends (93%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | ✓ yes | ||
| Warp | ✓ yes | ||
| Kitty | 0.46.2 | ✓ yes | |
| Cursor | ✓ yes | ||
| Terminal.app | ✓ yes |