Features›SGR (Text Styling)›Strikethrough (SGR 9)

Strikethrough (SGR 9)

Category: sgr · Baseline: core · Tags: ECMA-48 Standard · Specification ↗

ESC [ 9 m

SGR 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.

How this is testedautomated
Send \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.

Analysis2026-04-06

Supported by 11 of 12 terminals (92%). Not supported by: vt100.js. Part of the Core TUI baseline. Notes: vt100.js: Not in VT100/VT220 — use vterm.js for modern SGR.

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
Cursor		✓ yes
Terminal.app		✓ yes

Headless Backends

Parser correctness only — a ✓ means the parser accepts the sequence.

Backend	Version	Support	Notes
Alacritty	0.26.0	✓ yes
Kitty	0.40.0	✓ yes
vterm	0.2.0	✓ yes
WezTerm	0.1.0-fork.5	✓ yes
xterm.js	5.5.0	✓ yes
vt100.js	0.2.1	✗ no	Not in VT100/VT220 — use vterm.js for modern SGR

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