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CJK wide chars (2 cols)
Tests whether CJK (Chinese, Japanese, Korean) ideographs correctly occupy two terminal columns. The Unicode Standard Annex #11 defines East Asian Width properties. Terminals must account for this in cursor positioning — after rendering a CJK character, the cursor advances by 2 columns, not 1. Incorrect width handling breaks TUI layouts and cursor alignment.
Supported by 6 of 6 backends (100%)
Support Matrix
| Backend | Version | Support | Notes |
|---|---|---|---|
| Alacritty | 0.26.0 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| Kitty | 0.40.0 | ✓ yes | |
| vt100 | 0.1.0 | ✓ yes | |
| WezTerm | 0.1.0-fork.5 | ✓ yes | |
| xterm.js | 5.5.0 | ✓ yes |