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Scrollback accumulates
Tests whether lines scrolled off the top of the visible screen are preserved in the scrollback buffer. This is fundamental terminal behavior — without scrollback accumulation, users cannot scroll up to see previous output. Virtually all modern terminals maintain a scrollback buffer, though the maximum size varies.
How this is testedautomated
Write 30 lines (exceeding the 24-row screen), verify total line count exceeds 24.
Write 30 lines (exceeding the 24-row screen), verify total line count exceeds 24.
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 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 |