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Erase to BOL (EL 1)
ESC [ 1 KEL 1 erases from the beginning of the line to the cursor position (inclusive). The sequence is
ESC [ 1 K. Less commonly used than EL 0 (erase to end of line).How this is testedautomated
Write "XXXXX", move to col 3, send
Write "XXXXX", move to col 3, send
\x1b[1K (EL 1), verify cell at (0,0) is blank.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 |