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xterm.js
Backend: @xterm/headless — JS-only, no DOM rendering. (js) · v5.5.0
⚠ Headless mode doesn't expose cursor visibility or underline variants
81%
50 passed · 12 failed of 62 features
Tested: March 24, 2026
Cursor
| Feature | Support | Notes |
|---|---|---|
| Hide cursor (DECTCEM) | ✗ no | Headless mode doesn't track cursor visibility |
| Cursor position (CUP) | ✓ yes | |
| Cursor back (CUB) | ✓ yes | |
| Cursor down (CUD) | ✓ yes | |
| Cursor forward (CUF) | ✓ yes | |
| Cursor home | ✓ yes | |
| Cursor up (CUU) | ✓ yes | |
| Save/restore cursor (DECSC) | ✓ yes |
Erase
| Feature | Support | Notes |
|---|---|---|
| Erase line (EL 2) | ✓ yes | |
| Erase to BOL (EL 1) | ✓ yes | |
| Erase to EOL (EL 0) | ✓ yes | |
| Erase screen (ED 2) | ✓ yes | |
| Erase below (ED 0) | ✓ yes |
Extensions
| Feature | Support | Notes |
|---|---|---|
| Kitty graphics protocol | ✗ no | Not implemented in xterm.js |
| Kitty keyboard protocol | ✗ no | Not implemented in xterm.js |
| Window title (OSC 2) | ✓ yes | |
| Hyperlinks (OSC 8) | ✓ yes | |
| Text reflow on resize | ✓ yes | |
| Semantic prompts (OSC 133) | ✗ no | Not implemented in xterm.js |
| Sixel graphics | ✗ no | Not implemented in xterm.js |
| 24-bit truecolor | ✓ yes |
Modes
| Feature | Support | Notes |
|---|---|---|
| Enter alt screen (DECSET 1049) | ✓ yes | |
| Exit alt screen (DECRST 1049) | ✓ yes | |
| App cursor keys (DECCKM) | ✓ yes | |
| Auto-wrap (DECAWM) | ✓ yes | |
| Bracketed paste (DECSET 2004) | ✓ yes | |
| Focus tracking (DECSET 1004) | ✓ yes | |
| Mouse tracking (DECSET 1000) | ✓ yes | |
| Reverse video (DECSCNM) | ✗ no | Headless mode doesn't track reverse video mode |
Reset
| Feature | Support | Notes |
|---|---|---|
| Backend reset() method | ✓ yes | |
| Full reset (RIS) | ✓ yes | |
| SGR reset clears attributes | ✓ yes |
Scrollback
| Feature | Support | Notes |
|---|---|---|
| Scrollback accumulates | ✓ yes | |
| Alt screen separate scrollback | ✓ yes | |
| Reverse index (RI) | ✓ yes | |
| Scroll up (SU) | ✗ no | Headless API reads from buffer, not viewport after scroll |
| Total line count | ✓ yes |
SGR (Text Styling)
| Feature | Support | Notes |
|---|---|---|
| 256-color bg (SGR 48;5) | ✓ yes | |
| 24-bit bg (SGR 48;2) | ✓ yes | |
| Blink (SGR 5) | ✓ yes | Headless mode doesn't expose blink attribute |
| Bold (SGR 1) | ✓ yes | |
| Faint/dim (SGR 2) | ✓ yes | |
| 256-color fg (SGR 38;5) | ✓ yes | |
| 24-bit fg (SGR 38;2) | ✓ yes | |
| Hidden/invisible (SGR 8) | ✓ yes | Headless mode doesn't expose hidden attribute |
| Inverse video (SGR 7) | ✓ yes | |
| Italic (SGR 3) | ✓ yes | |
| Reset all (SGR 0) | ✓ yes | |
| Strikethrough (SGR 9) | ✓ yes | |
| Curly underline (SGR 4:3) | ✗ no | Headless mode treats all underline variants as single |
| Dashed underline (SGR 4:5) | ✗ no | Headless mode treats all underline variants as single |
| Dotted underline (SGR 4:4) | ✗ no | Headless mode treats all underline variants as single |
| Double underline (SGR 21) | ✗ no | Headless mode treats all underline variants as single |
| Underline (SGR 4) | ✓ yes |
Text
| Feature | Support | Notes |
|---|---|---|
| Basic text rendering | ✓ yes | |
| Carriage return | ✓ yes | |
| Line feed | ✓ yes | |
| Overwrite at cursor | ✓ yes | |
| Tab stops | ✓ yes | |
| CJK wide chars (2 cols) | ✓ yes | |
| Emoji wide chars (2 cols) | ✗ no | Headless mode reports emoji as single-width |
| Text wraps at width | ✓ yes |