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Erase scrollback (ED 3)
ESC [ 3 JED 3 clears the scrollback buffer. The sequence is
ESC [ 3 J. An xterm extension not part of ECMA-48. Applications may use this for security purposes (clearing sensitive output from scrollback after a password prompt) or to implement a "clear" command that truly clears all terminal history.How this is testedautomated
Write 30 lines to fill scrollback, send
Write 30 lines to fill scrollback, send
\x1b[3J (ED 3), verify total line count is at most screen height.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 Core TUI baseline.
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 |