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Tab stops
HT (Horizontal Tab) advances the cursor to the next tab stop. Default tab stops are set every 8 columns. The tab character (0x09) does not produce visible output — it moves the cursor forward. Tab stops can be set with HTS and cleared with TBC.
How this is testedautomated
Write tab then "X", verify X appears at column 8 (after the default 8-column tab stop).
Write tab then "X", verify X appears at column 8 (after the default 8-column tab stop).
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 |