Terminfo.devCan your terminal do that?

Feature support tables for terminal emulators — powered by Termless, Playwright for terminals

Terminal Applications

Headless Backends

Does your terminal support truecolor, modern keyboard protocols, or image rendering? Real data from automated tests (Termless) and user contributions.

Terminal Applications

Tested on real terminal applications. Run npx terminfo.dev to test yours.

94%238 / 254

91%231 / 254

88%223 / 254

86%218 / 254

Kitty0.46.2

86%218 / 254

85%216 / 254

84%214 / 254

Terminal Baseline 2026

Inspired by Web Baseline — minimum feature sets that terminals should support. For the weird and wonderful history of protocols that didn't make the cut, see the Legacy baseline.

🟢Core80 features

Every terminal should support these — SGR basics, cursor, erase, alt screen

Terminal.app90%

🔵Modern68 features

Expected by modern TUIs — truecolor, bracketed paste, focus events, mouse

Terminal.app82%

🟣Rich96 features

Advanced features — kitty keyboard, graphics, hyperlinks, semantic prompts

Terminal.app70%

🌐Unicode8 features

Unicode correctness — wide chars, combining, emoji, grapheme clusters

Terminal.app63%

Feature Matrix

Category: Baseline: Search:

	iTerm2	Ghostty	VS Code	Warp	Kitty	Cursor	Terminal.app
SGR (Text Styling)
256-color bg (SGR 48;5)	✓	✓	✓	✓	✓	✓	✓
Bright bg colors (SGR 100-107)	✓	✓	✓	✓	✓	✓	✓
Default bg color (SGR 49)	✓	✓	✓	✓	✓	✓	✓
Standard bg colors (SGR 40-47)	✓	✓	✓	✓	✓	✓	✓
24-bit bg (SGR 48;2)	✓	✓	✓	✓	✓	✓	✓
Blink (SGR 5)	✓	✓	✓	✓	✓	✓	✓
Bold (SGR 1)	✓	✓	✓	✓	✓	✓	✓
Faint/dim (SGR 2)	✓	✓	✓	✓	✓	✓	✓
256-color fg (SGR 38;5)	✓	✓	✓	✓	✓	✓	✓
Bright fg colors (SGR 90-97)	✓	✓	✓	✓	✓	✓	✓
Default fg color (SGR 39)	✓	✓	✓	✓	✓	✓	✓
Standard fg colors (SGR 30-37)	✓	✓	✓	✓	✓	✓	✓
24-bit fg (SGR 38;2)	✓	✓	✓	✓	✓	✓	✓
Hidden/invisible (SGR 8)	✓	✓	✓	✓	✓	✓	✓
Inverse video (SGR 7)	✓	✓	✓	✓	✓	✓	✓
Italic (SGR 3)	✓	✓	✓	✓	✓	✓	✓
Overline (SGR 53)	✓	✓	✓	✓	✓	✓	✓
Reset all (SGR 0)	✓	✓	✓	✓	✓	✓	✓
Reset bold/dim (SGR 22)	✓	✓	✓	✓	✓	✓	✓
Reset inverse (SGR 27)	✓	✓	✓	✓	✓	✓	✓
Reset italic (SGR 23)	✓	✓	✓	✓	✓	✓	✓
Reset underline (SGR 24)	✓	✓	✓	✓	✓	✓	✓
Strikethrough (SGR 9)	✓	✓	✓	✓	✓	✓	✓
Underline color, indexed (SGR 58;5)	✓	✓	✓	✓	✓	✓	✓
Reset underline color (SGR 59)	✓	✓	✓	✓	✓	✓	✓
Underline color, truecolor (SGR 58;2)	✓	✓	✓	✓	✓	✓	✓
Underline color (SGR 58)	✓	✓	✓	✓	✓	✓	✓
Curly underline (SGR 4:3)	✓	✓	✓	✓	✓	✓	✓
Dashed underline (SGR 4:5)	✓	✓	✓	✓	✓	✓	✓
Dotted underline (SGR 4:4)	✓	✓	✓	✓	✓	✓	✓
Double underline (SGR 21)	✓	✓	✓	✓	✓	✓	✓
Underline (SGR 4)	✓	✓	✓	✓	✓	✓	✓
Cursor
ANSI restore cursor (CSI u)	✓	✓	✓	✓	✗	✓	✗
ANSI save cursor (CSI s)	✓	✓	✓	✓	✗	✓	✗
CPL cursor preceding line (CSI F)	✓	✓	✓	✓	✓	✓	✓
CUD stops at bottom	✓	✓	✓	✓	✓	✓	✓
CUP at screen boundaries	✗	✗	✗	✗	✓	✗	✓
CUP with DECOM	✗	✗	✓	✓	✗	✓	✗
CUU stops at top	✓	✓	✓	✓	✓	✓	✓
Hide cursor (DECTCEM)	✓	✓	✓	✓	✓	✓	✓
Cursor horizontal absolute (CHA)	✓	✓	✓	✓	✓	✓	✓
HPA horizontal position absolute (CSI `)	✓	✓	✓	✓	✓	✓	✓
Cursor position (CUP)	✓	✓	✓	✓	✓	✓	✓
Cursor back (CUB)	✓	✓	✗	✗	✓	✗	✗
Cursor down (CUD)	✓	✓	✗	✗	✓	✗	✗
Cursor forward (CUF)	✓	✓	✓	✓	✓	✓	✓
Cursor home	✓	✓	✓	✓	✓	✓	✓
Cursor up (CUU)	✓	✓	✗	✗	✓	✗	✗
Cursor next line (CNL)	✓	✓	✓	✓	✓	✓	✓
Cursor position report (DSR 6)	✓	✓	✓	✓	✓	✓	✓
Reverse Wrap (Mode 45)	✓	✓	✓	✓	✓	✓	✓
Save/restore cursor (DECSC)	✓	✓	✓	✓	✓	✓	✓
Cursor shape (DECSCUSR)	✓	✓	✓	✓	✓	✓	✓
VPA vertical position absolute (CSI d)	✓	✓	✓	✓	✓	✓	✓
Text
Backspace (BS)	✓	✓	✓	✓	✓	✓	✓
Basic text rendering	✓	✓	✓	✓	✓	✓	✓
CBT backward tab (CSI Z)	✗	✗	✗	✗	✗	✗	✗
CHT forward tab (CSI I)	✗	✗	✗	✗	✗	✗	✗
Combining characters (0 cols)	✓	✓	✓	✓	✓	✓	✓
Carriage return	✓	✓	✓	✓	✓	✓	✓
HTS set tab stop (ESC H)	✓	✓	✓	✓	✓	✓	✓
Index (IND)	✓	✓	✓	✓	✓	✓	✓
Line feed	✓	✓	✓	✓	✓	✓	✓
Next line (NEL)	✓	✓	✓	✓	✓	✓	✓
Overwrite at cursor	✓	✓	✓	✓	✓	✓	✓
Reverse Index at Scroll Top	✓	✓	✓	✓	✓	✓	✓
Tab stops	✓	✓	✓	✓	✓	✓	✓
TBC clear tab stop (CSI g)	✗	✗	✗	✗	✗	✗	✗
CJK wide chars (2 cols)	✓	✓	✓	✓	✓	✓	✓
Emoji wide chars (2 cols)	✓	✓	✓	✓	✓	✓	✓
Regional indicator flags (2 cols)	✓	✓	✓	✓	✓	✓	✓
Variation selector 16 (emoji presentation)	✓	✓	✗	✗	✗	✗	✗
Emoji ZWJ sequences (2 cols)	✓	✓	✗	✗	✗	✗	✗
Text wraps at width	✓	✓	✓	✓	✓	✓	✓
Erase
Erase character (ECH)	✓	✓	✓	✓	✓	✓	✓
ED at scroll region boundary	✓	✓	✓	✓	✓	✓	✓
EL erases with bg color	✓	✓	✓	✓	✓	✓	✓
Erase line (EL 2)	✓	✓	✓	✓	✓	✓	✓
Erase to BOL (EL 1)	✓	✓	✓	✓	✓	✓	✓
Erase to EOL (EL 0)	✓	✓	✓	✓	✓	✓	✓
Erase above (ED 1)	✓	✓	✓	✓	✓	✓	✓
Erase screen (ED 2)	✓	✓	✓	✓	✓	✓	✓
Erase below (ED 0)	✓	✓	✓	✓	✓	✓	✓
Erase scrollback (ED 3)	✓	✓	✓	✓	✓	✓	✓
Selective Erase (DECSED)	✓	✓	✓	✓	✓	✓	✓
Editing
DECCARA — change attrs in rectangle	✓	✓	✓	✓	✓	✓	✓
DECCRA — copy rectangular area	✓	✓	✓	✓	✓	✓	✓
DECDC — delete columns (CSI Ps ' ~)	✓	✓	✓	✓	✓	✓	✓
DECERA — erase rectangular area	✓	✓	✓	✓	✓	✓	✓
DECFRA — fill rectangular area	✓	✓	✓	✓	✓	✓	✓
DECIC — insert columns (CSI Ps ' })	✓	✓	✓	✓	✓	✓	✓
DECRARA — reverse attrs in rectangle	✓	✓	✓	✓	✓	✓	✓
DECRQCRA — checksum rectangular area	✗	✗	✗	✗	✗	✗	✗
DECSACE — select attribute-change extent	✓	✓	✓	✓	✓	✓	✓
DECSERA — selective erase rectangular area	✓	✓	✓	✓	✓	✓	✓
Delete characters (DCH)	✓	✓	✓	✓	✓	✓	✓
Delete lines (DL)	✓	✓	✓	✓	✓	✓	✓
Insert characters (ICH)	✓	✓	✓	✓	✓	✓	✓
Insert lines (IL)	✓	✓	✓	✓	✓	✓	✓
Repeat character (REP)	✓	✓	✓	✓	✓	✓	✓
SL — shift left (CSI Ps SP @)	✓	✓	✓	✓	✓	✓	✓
SR — shift right (CSI Ps SP A)	✓	✓	✓	✓	✓	✓	✓
Modes
Enter alt screen (DECSET 1049)	✓	✓	✓	✓	✓	✓	✓
Exit alt screen (DECRST 1049)	✓	✓	✓	✓	✓	✓	✓
Alt-scroll mouse wheel (?1007)	✓	✓	✓	✓	✓	✓	✓
Alt screen clear-on-enter (?1047)	✓	✓	✓	✓	✓	✓	✓
Save/restore cursor (?1048)	✓	✓	✓	✗	✗	✓	✗
Alt screen legacy (?47)	✓	✓	✓	✓	✓	✓	✓
App cursor keys (DECCKM)	✓	✓	✓	✓	✓	✓	✓
Application keypad (DECKPAM)	✓	✓	✓	✓	✓	✓	✓
Auto-wrap (DECAWM)	✓	✓	✓	✓	✓	✓	✓
Bracketed paste (DECSET 2004)	✓	✓	✓	✓	✓	✓	✓
Mode 2031 color scheme reporting	✓	✓	✗	✗	✗	✗	✗
DECCOLM 80/132 column switch (?3)	✓	✓	✓	✓	✓	✓	✓
DECSCLM — smooth scroll mode	?	?	?	?	?	?	?
DECSSCLS — set scroll speed	?	?	?	?	?	?	?
Focus tracking (DECSET 1004)	✓	✓	✓	✓	✓	✓	✓
Insert/replace mode (IRM)	✓	✓	✓	✓	✓	✓	✓
Left/Right Margins (DECLRMM, Mode 69)	✓	✓	✓	✓	✓	✓	✓
All motion mouse (DECSET 1003)	✓	✓	✓	✓	✓	✓	✓
SGR mouse mode (DECSET 1006)	✓	✓	✓	✓	✓	✓	✓
Mouse tracking (DECSET 1000)	✓	✓	✓	✓	✓	✓	✓
Origin mode (DECOM)	✓	✓	✓	✓	✗	✓	✗
Reverse video (DECSCNM)	✓	✓	✓	✓	✓	✓	✓
Synchronized output (DECSET 2026)	✓	✓	✓	✓	✓	✓	✓
UTF-8 mouse mode (?1005)	✓	✓	✓	✓	✓	✓	✓
Pop color palette (CSI # Q)	✓	✓	✓	✓	✓	✓	✓
XTPOPSGR — pop SGR stack (CSI # })	✓	✓	✓	✓	✓	✓	✓
Push color palette (CSI # P)	✓	✓	✓	✓	✓	✓	✓
XTPUSHSGR — push SGR stack (CSI # {)	✓	✓	✓	✓	✓	✓	✓
XTRESTORE — restore DEC private modes (CSI ? Pm r)	✓	✓	✓	✓	✓	✓	✓
XTSAVE — save DEC private modes (CSI ? Pm s)	✓	✓	✓	✓	✓	✓	✓
Scrollback
Scrollback accumulates	✓	✓	✓	✓	✓	✓	✓
Alt screen separate scrollback	✓	✓	✓	✓	✓	✓	✓
DECSTBM constrains scrolling	✓	✓	✓	✓	✓	✓	✓
DECSTBM reset to full screen	✓	✓	✓	✓	✓	✓	✓
Reverse index (RI)	✓	✓	✓	✓	✓	✓	✓
Scroll down (SD)	✓	✓	✓	✓	✓	✓	✓
Scroll up (SU)	✓	✓	✓	✓	✓	✓	✓
Scroll region (DECSTBM)	✓	✓	✓	✓	✓	✓	✓
Total line count	✓	✓	✓	✓	✓	✓	✓
Reset
DECALN screen alignment (ESC # 8)	✓	✓	✓	✗	✓	✓	✗
Backend reset() method	✓	✓	✓	✓	✓	✓	✓
Full reset (RIS)	✓	✓	✓	✓	✓	✓	✓
SGR reset clears attributes	✓	✓	✓	✓	✓	✓	✓
Soft reset (DECSTR)	✓	✓	✓	✓	✓	✓	✓
Extensions
System clipboard paste	?	?	?	?	?	?	?
Font ligatures	?	?	?	?	?	?	?
iTerm2 Inline Images (OSC 1337)	✓	✓	✓	✓	✓	✓	✓
Kitty graphics protocol	✓	✓	✗	✓	✓	✗	✓
Kitty graphics: animation	✓	✓	✓	✓	✓	✓	✓
Kitty graphics: display	✓	✓	✗	✓	✓	✗	✓
Kitty graphics: transmit	✓	✓	✓	✓	✓	✓	✓
Kitty graphics: Unicode placeholders	✗	✗	✗	✗	✓	✗	✓
Kitty keyboard protocol	✓	✓	✓	✓	✗	✗	✗
Kitty keyboard: DISAMBIGUATE (flag 1)	✓	✓	✓	✓	✗	✗	✗
Kitty keyboard: REPORT_ALL_KEYS (flag 8)	✓	✓	✓	✓	✗	✗	✗
Kitty keyboard: REPORT_ALTERNATE (flag 4)	✓	✓	✓	✓	✗	✗	✗
Kitty keyboard: REPORT_EVENTS (flag 2)	✓	✓	✓	✓	✗	✗	✗
Kitty keyboard: REPORT_TEXT (flag 16)	✓	✓	✓	✓	✗	✗	✗
Desktop Notifications (OSC 9/777)	✓	✓	✓	✓	✓	✓	✓
VS Code Shell Integration (OSC 633)	✓	✓	✓	✓	✓	✓	✓
Icon and title (OSC 0)	✓	✓	✓	✓	✓	✓	✓
Icon name (OSC 1)	✓	✓	✓	✓	✓	✓	✓
Foreground color query (OSC 10)	✓	✓	✓	✓	✓	✓	✓
Reset color palette (OSC 104)	✓	✓	✓	✓	✓	✓	✓
Background color query (OSC 11)	✓	✓	✓	✓	✓	✓	✓
Reset foreground color (OSC 110)	✓	✓	✓	✓	✓	✓	✓
Reset background color (OSC 111)	✓	✓	✓	✓	✓	✓	✓
Reset cursor color (OSC 112)	✓	✓	✓	✓	✓	✓	✓
Reset pointer fg color (OSC 113)	✓	✓	✓	✓	✓	✓	✓
Reset pointer bg color (OSC 114)	✓	✓	✓	✓	✓	✓	✓
Reset highlight background (OSC 117)	✓	✓	✓	✓	✓	✓	✓
Reset highlight foreground (OSC 119)	✓	✓	✓	✓	✓	✓	✓
Cursor color (OSC 12)	✓	✓	✓	✓	✓	✓	✓
OSC 133;A prompt start (FTCS_PROMPT)	✓	✓	✓	✓	✓	✓	✓
OSC 133;B command start (FTCS_COMMAND_START)	✓	✓	✓	✓	✓	✓	✓
OSC 133;C command executed (FTCS_COMMAND_EXECUTED)	✓	✓	✓	✓	✓	✓	✓
OSC 133;D command finished (FTCS_COMMAND_FINISHED)	✓	✓	✓	✓	✓	✓	✓
OSC 133;P properties	✓	✓	✓	✓	✓	✓	✓
iTerm2 Capability Reporting (OSC 1337)	✗	✗	✗	✗	✗	✗	✗
iTerm2 Cell Size Reporting (OSC 1337)	✗	✗	✗	✗	✗	✗	✗
Highlight background (OSC 17)	✓	✗	✗	✗	✓	✗	✓
Set Wayland app-id (OSC 176)	✓	✓	✓	✓	✓	✓	✓
Highlight foreground (OSC 19)	✓	✗	✗	✗	✓	✗	✓
Window title (OSC 2)	✓	✓	✓	✓	✓	✓	✓
Kitty color protocol (OSC 21)	✓	✓	✓	✓	✓	✓	✓
Pointer shape (OSC 22)	✓	✓	✓	✓	✓	✓	✓
Kitty color stack push (OSC 30001)	✓	✓	✓	✓	✓	✓	✓
Systemd context (OSC 3008)	✓	✓	✓	✓	✓	✓	✓
Kitty color stack pop (OSC 30101)	✓	✓	✓	✓	✓	✓	✓
Color palette (OSC 4)	✓	✓	✓	✗	✓	✓	✓
Audio sound (OSC 440)	✓	✓	✓	✓	✓	✓	✓
Special color (OSC 5)	✗	✗	✗	✗	✓	✗	✓
Clipboard access (OSC 52)	✓	✓	✓	✓	✓	✓	✓
OSC 52 clipboard read	✓	✗	✓	✗	✗	✓	✗
OSC 52 clipboard write	✓	✓	✓	✓	✓	✓	✓
OSC 5522 advanced clipboard	✗	✗	✗	✗	✗	✗	✗
Screen flash (OSC 555)	✓	✓	✓	✓	✓	✓	✓
OSC 633;A prompt start	✓	✓	✓	✓	✓	✓	✓
OSC 633;B prompt end	✓	✓	✓	✓	✓	✓	✓
OSC 633;C pre-execution	✓	✓	✓	✓	✓	✓	✓
OSC 633;D command finished	✓	✓	✓	✓	✓	✓	✓
OSC 633;E set commandline	✓	✓	✓	✓	✓	✓	✓
OSC 633;P properties	✓	✓	✓	✓	✓	✓	✓
OSC 66 text sizing	✓	✓	✓	✓	✓	✓	✓
VTE termprop (OSC 666)	✓	✓	✓	✓	✓	✓	✓
Current directory (OSC 7)	✓	✓	✓	✓	✓	✓	✓
Locale query/set (OSC 701)	✓	✓	✓	✓	✓	✓	✓
Version query (OSC 702)	✓	✓	✓	✓	✓	✓	✓
Set normal font (OSC 710)	✓	✓	✓	✓	✓	✓	✓
Scroll view up (OSC 720)	✓	✓	✓	✓	✓	✓	✓
Cell size report (OSC 776)	✓	✓	✓	✓	✓	✓	✓
Notifications (OSC 777)	✓	✓	✓	✓	✓	✓	✓
Font size query/set (OSC 7770)	✓	✓	✓	✓	✓	✓	✓
Font + window size (OSC 7777)	✓	✓	✓	✓	✓	✓	✓
Hyperlinks (OSC 8)	✓	✓	✓	✓	✓	✓	✓
OSC 9;4 progress bar	✓	✓	✓	✓	✓	✓	✓
Desktop notifications (OSC 99)	✓	✓	✓	✓	✓	✓	✓
Text reflow on resize	✓	✓	✓	✓	✓	✓	✓
Semantic prompts (OSC 133)	✓	✓	✓	✓	✓	✓	✓
Sixel graphics	✗	✗	✗	✗	✓	✗	✓
Sixel support in DA1	✓	✗	✗	✗	✗	✗	✗
Sixel geometry report (CSI ? Pi;Pa;Pv S)	✗	✗	✗	✗	✗	✗	✗
24-bit truecolor	✓	✓	✓	✓	✓	✓	✓
Character Sets
DEC line drawing character set	✓	✓	✓	✓	✓	✓	✓
DEC Special Graphics	✓	✓	✓	✓	✓	✓	✓
G0/G1 character set switching	✓	✓	✓	✓	✓	✓	✓
UTF-8 mode	✓	✓	✓	✓	✓	✓	✓
Device Status
Mode Report (DECRPM)	✓	✓	✓	✗	✗	✓	✗
Request Setting (DECRQSS)	✓	✓	✓	✗	✗	✓	✗
DSR ?996 — color scheme query	?	?	?	?	?	?	?
COLORTERM env variable	?	?	?	?	?	?	?
KITTY_* env variables	?	?	?	?	?	?	?
LC_TERMINAL env variable	?	?	?	?	?	?	?
NO_COLOR env variable	?	?	?	?	?	?	?
TERM env variable	?	?	?	?	?	?	?
TERM_PROGRAM env variable	?	?	?	?	?	?	?
VTE_VERSION env variable	?	?	?	?	?	?	?
WEZTERM_* env variables	?	?	?	?	?	?	?
WT_SESSION env variable	?	?	?	?	?	?	?
Primary device attributes (DA1)	✓	✓	✓	✓	✓	✓	✓
Secondary Device Attributes (DA2)	✓	✓	✓	✓	✓	✓	✓
Device status report (DSR 5)	✓	✓	✓	✓	✓	✓	✓
Feature Reporting (TERM_FEATURES)	✓	✗	✗	✗	✗	✗	✗
Tertiary Device Attributes (DA3)	✓	✗	✗	✗	✗	✗	✗
Query Terminfo (XTGETTCAP)	✓	✓	✗	✗	✗	✗	✗
XTGETXRES — query resource value (DCS + Q)	✗	✗	✗	✗	✗	✗	✗
XTREPORTCOLORS — report color capabilities (CSI # R)	✗	✗	✗	✗	✗	✗	✗
Terminal Version (XTVERSION)	✓	✓	✓	✓	✗	✗	✗
Report window size in pixels (CSI 14 t)	✓	✓	✓	✓	✓	✓	✓
Report cell size in pixels (CSI 16 t)	✗	✓	✓	✗	✗	✓	✗
Report text area size in chars (CSI 18 t)	✓	✓	✓	✓	✓	✓	✓
Report icon label (CSI 20 t)	✓	✗	✗	✗	✗	✗	✗
Report window title (CSI 21 t)	✓	✗	✗	✗	✗	✗	✗
Push title/icon stack (CSI 22 ; 0 t)	✓	✓	✓	✓	✓	✓	✓
Pop title/icon stack (CSI 23 ; 0 t)	✓	✓	✓	✓	✓	✓	✓
Input Protocols
Button-Event Mouse (1002)	✓	✓	✓	✓	✓	✓	✓
CSI u Key Encoding	✓	✓	✓	✓	✓	✓	✓
Kitty click events	?	?	?	?	?	?	?
modifyOtherKeys	✓	✓	✓	✓	✓	✓	✓
modifyOtherKeys mode 3	✓	✓	✓	✓	✓	✓	✓
Pixel Mouse Reporting (1016)	✓	✓	✓	✓	✓	✓	✓
urxvt Mouse Reporting (1015)	✓	✓	✓	✓	✓	✓	✓
X10 Mouse Tracking (9)	✓	✓	✓	✓	✓	✓	✓
Unicode
East Asian Ambiguous Width	✓	✓	✓	✓	✓	✓	✓
Grapheme Cluster Cursor Movement	✓	✓	✗	✗	✗	✗	✗
Tab Stops (HT)	✓	✓	✓	✓	✓	✓	✓
Wide Char at Line Wrap	✓	✓	✓	✓	✓	✓	✓

Headless Backends

Parser correctness tested via Termless — headless libraries may not expose all features through their API

Headless backends test parser correctness, not rendering. A ✓ means the parser accepts the sequence, not that it renders correctly.

vterm0.2.0

94%218 / 233

66%154 / 233

Alacritty0.26.0

61%142 / 233

WezTerm0.1.0-fork.5

61%142 / 233

46%107 / 233

Headless Baseline Coverage

	vterm	xterm.js	Alacritty	WezTerm	vt100.js
SGR (Text Styling)
256-color bg (SGR 48;5)	✓	✓	✓	~	✗
Bright bg colors (SGR 100-107)	✓	✓	✓	~	✗
Default bg color (SGR 49)	✓	✓	✓	✓	✓
Standard bg colors (SGR 40-47)	✓	✓	✓	~	✗
24-bit bg (SGR 48;2)	✓	✓	✓	✓	✗
Blink (SGR 5)	✓	~	~	~	✓
Bold (SGR 1)	✓	✓	✓	✓	✓
Faint/dim (SGR 2)	✓	✓	✓	✓	✗
256-color fg (SGR 38;5)	✓	✓	✓	~	✗
Bright fg colors (SGR 90-97)	✓	✓	✓	~	✗
Default fg color (SGR 39)	✓	✓	✓	✓	✓
Standard fg colors (SGR 30-37)	✓	✓	~	~	✗
24-bit fg (SGR 38;2)	✓	✓	✓	✓	✗
Hidden/invisible (SGR 8)	✓	~	~	~	✗
Inverse video (SGR 7)	✓	✓	✓	✓	✓
Italic (SGR 3)	✓	✓	✓	✓	✗
Overline (SGR 53)	✓	✓	✓	✓	✓
Reset all (SGR 0)	✓	✓	✓	✓	✓
Reset bold/dim (SGR 22)	✓	✓	✓	✓	✓
Reset inverse (SGR 27)	✓	✓	✓	✓	✓
Reset italic (SGR 23)	✓	✓	✓	✓	✓
Reset underline (SGR 24)	✓	✓	✓	✓	✓
Strikethrough (SGR 9)	✓	✓	✓	✓	✗
Underline color, indexed (SGR 58;5)	✓	✓	~	~	✗
Reset underline color (SGR 59)	✓	✓	✓	✓	✗
Underline color, truecolor (SGR 58;2)	✓	✓	~	~	✗
Underline color (SGR 58)	✓	✓	~	~	✗
Curly underline (SGR 4:3)	✓	✓	✓	✓	✗
Dashed underline (SGR 4:5)	✓	✓	✓	✓	✗
Dotted underline (SGR 4:4)	✓	✓	✓	✓	✗
Double underline (SGR 21)	✓	✓	~	✓	✗
Underline (SGR 4)	✓	✓	✓	✓	✓
Cursor
ANSI restore cursor (CSI u)	✓	✓	✓	✓	✓
ANSI save cursor (CSI s)	✓	✓	✓	✓	✓
CPL cursor preceding line (CSI F)	✓	✓	✓	✓	✓
CUD stops at bottom	✓	✓	✓	✓	✓
CUP at screen boundaries	✓	✓	✓	✗	✓
CUP with DECOM	✓	✓	✓	✓	✗
CUU stops at top	✓	✓	✓	✓	✓
Hide cursor (DECTCEM)	✓	~	✓	✓	✓
Cursor horizontal absolute (CHA)	✓	✓	✓	✓	✓
HPA horizontal position absolute (CSI `)	✓	✓	✓	✓	✗
Cursor position (CUP)	✓	✓	✓	✓	✓
Cursor back (CUB)	✓	✓	✓	✓	✓
Cursor down (CUD)	✓	✓	✓	✓	✓
Cursor forward (CUF)	✓	✓	✓	✓	✓
Cursor home	✓	✓	✓	✓	✓
Cursor up (CUU)	✓	✓	✓	✓	✓
Cursor next line (CNL)	✓	✓	✓	✓	✓
Cursor position report (DSR 6)	✓	~	~	~	✓
Reverse Wrap (Mode 45)	✓	✓	✗	✓	✓
Save/restore cursor (DECSC)	✓	✓	✓	✓	✓
Cursor shape (DECSCUSR)	✓	~	✓	✓	✗
VPA vertical position absolute (CSI d)	✓	✓	✓	✓	✓
Text
Backspace (BS)	✓	✓	✓	✓	✓
Basic text rendering	✓	✓	✓	✓	✓
CBT backward tab (CSI Z)	✓	✓	✓	✓	✗
CHT forward tab (CSI I)	✓	✓	✓	✓	✗
Combining characters (0 cols)	✓	✓	✓	✓	✗
Carriage return	✓	✓	✓	✓	✓
HTS set tab stop (ESC H)	✓	✓	✓	✓	✗
Index (IND)	✓	✓	✓	✓	✓
Line feed	✓	✓	✓	✓	✓
Next line (NEL)	✓	✓	✓	✓	✓
Overwrite at cursor	✓	✓	✓	✓	✓
Reverse Index at Scroll Top	✓	✓	✓	✓	✓
Tab stops	✓	✓	✓	✓	✓
TBC clear tab stop (CSI g)	✓	✗	✗	✗	✗
CJK wide chars (2 cols)	✓	✓	✓	✓	✗
Emoji wide chars (2 cols)	✓	✗	✓	✓	✗
Regional indicator flags (2 cols)	✓	✗	✗	✓	✗
Variation selector 16 (emoji presentation)	✓	✗	✗	✗	✗
Emoji ZWJ sequences (2 cols)	✓	✓	✓	✓	✓
Text wraps at width	✓	✓	✓	✓	✓
Erase
Erase character (ECH)	✓	✓	✓	✓	✗
ED at scroll region boundary	✓	✓	✓	✓	✓
EL erases with bg color	✓	✓	✓	✗	✗
Erase line (EL 2)	✓	✓	✓	✓	✓
Erase to BOL (EL 1)	✓	✓	✓	✓	✓
Erase to EOL (EL 0)	✓	✓	✓	✓	✓
Erase above (ED 1)	✓	✓	✓	✓	✓
Erase screen (ED 2)	✓	✓	✗	✓	✓
Erase below (ED 0)	✓	✓	✓	✓	✓
Erase scrollback (ED 3)	✓	✓	✓	✓	✓
Selective Erase (DECSED)	✓	✓	✗	✗	✗
Editing
DECCARA — change attrs in rectangle	✗	✗	✗	✗	✗
DECCRA — copy rectangular area	✗	✗	✗	✗	✗
DECDC — delete columns (CSI Ps ' ~)	✗	✗	✗	✗	✗
DECERA — erase rectangular area	✗	✗	✗	✗	✗
DECFRA — fill rectangular area	✗	✗	✗	✗	✗
DECIC — insert columns (CSI Ps ' })	✗	✗	✗	✗	✗
DECRARA — reverse attrs in rectangle	✗	✗	✗	✗	✗
DECRQCRA — checksum rectangular area	✗	✗	✗	✗	✗
DECSACE — select attribute-change extent	✓	✓	✓	✓	✓
DECSERA — selective erase rectangular area	✗	✗	✗	✗	✗
Delete characters (DCH)	✓	✓	✓	✓	✗
Delete lines (DL)	✓	✓	✓	✓	✗
Insert characters (ICH)	✓	✓	✓	✓	✗
Insert lines (IL)	✓	✓	✓	✓	✗
Repeat character (REP)	✓	✓	✓	✓	✗
SL — shift left (CSI Ps SP @)	✗	✗	✗	✗	✗
SR — shift right (CSI Ps SP A)	✗	✗	✗	✗	✗
Modes
Enter alt screen (DECSET 1049)	✓	✓	✓	✓	✗
Exit alt screen (DECRST 1049)	✓	✓	✓	✓	✓
Alt-scroll mouse wheel (?1007)	✗	✗	✓	✓	✓
Alt screen clear-on-enter (?1047)	✓	✓	~	✓	✗
Save/restore cursor (?1048)	✓	✓	~	✓	✗
Alt screen legacy (?47)	✓	✓	✗	✓	✗
App cursor keys (DECCKM)	✓	✓	✓	✓	✓
Application keypad (DECKPAM)	~	✓	✓	~	✓
Auto-wrap (DECAWM)	✓	✓	✓	✓	✓
Bracketed paste (DECSET 2004)	✓	✓	✓	✓	✗
Mode 2031 color scheme reporting	✓	✗	✗	~	✗
DECCOLM 80/132 column switch (?3)	✗	✗	✓	✓	✓
DECSCLM — smooth scroll mode	?	?	?	?	?
DECSSCLS — set scroll speed	?	?	?	?	?
Focus tracking (DECSET 1004)	✓	✓	✓	✓	✗
Insert/replace mode (IRM)	✓	✓	✓	✓	✗
Left/Right Margins (DECLRMM, Mode 69)	✓	✗	~	~	✗
All motion mouse (DECSET 1003)	✓	✓	✓	✓	✗
SGR mouse mode (DECSET 1006)	✓	~	~	~	✗
Mouse tracking (DECSET 1000)	✓	✓	✓	✓	✗
Origin mode (DECOM)	✓	✓	✓	✓	✓
Reverse video (DECSCNM)	✓	~	~	✓	✓
Synchronized output (DECSET 2026)	✓	✓	✓	✓	✓
UTF-8 mouse mode (?1005)	✗	✗	✓	✓	✓
Pop color palette (CSI # Q)	✓	✓	✗	~	✓
XTPOPSGR — pop SGR stack (CSI # })	✓	✓	✗	~	✓
Push color palette (CSI # P)	✓	✓	✗	~	✓
XTPUSHSGR — push SGR stack (CSI # {)	✓	✓	✗	~	✓
XTRESTORE — restore DEC private modes (CSI ? Pm r)	✓	✓	✗	~	✓
XTSAVE — save DEC private modes (CSI ? Pm s)	✓	✓	✗	~	✓
Scrollback
Scrollback accumulates	✓	✓	✓	✓	✓
Alt screen separate scrollback	✓	✓	✓	✓	✗
DECSTBM constrains scrolling	✓	✓	✓	✓	✓
DECSTBM reset to full screen	✓	✓	✓	✓	✓
Reverse index (RI)	✓	✓	✓	✓	✓
Scroll down (SD)	✓	✓	✓	✓	✓
Scroll up (SU)	✓	~	✓	✓	✓
Scroll region (DECSTBM)	✓	✓	✓	✓	✓
Total line count	✓	✓	✓	✓	✓
Reset
DECALN screen alignment (ESC # 8)	✓	✓	✓	✓	✗
Backend reset() method	✓	✓	✓	✓	✓
Full reset (RIS)	✓	✓	✓	✓	✓
SGR reset clears attributes	✓	✓	✓	✓	✓
Soft reset (DECSTR)	✓	✓	~	~	✗
Extensions
System clipboard paste	?	?	?	?	?
Font ligatures	?	?	?	?	?
iTerm2 Inline Images (OSC 1337)	✓	✗	✗	✗	✗
Kitty graphics protocol	✓	✗	✗	✗	✗
Kitty graphics: animation	✓	✗	✗	✗	✗
Kitty graphics: display	✓	✗	✗	✗	✗
Kitty graphics: transmit	✓	✗	✗	✗	✗
Kitty graphics: Unicode placeholders	✓	✗	✗	✗	✗
Kitty keyboard protocol	✓	✗	✓	✓	✗
Kitty keyboard: DISAMBIGUATE (flag 1)	✓	✗	✓	✓	✗
Kitty keyboard: REPORT_ALL_KEYS (flag 8)	✓	✗	✓	✓	✗
Kitty keyboard: REPORT_ALTERNATE (flag 4)	✓	✗	✓	✓	✗
Kitty keyboard: REPORT_EVENTS (flag 2)	✓	✗	✓	✓	✗
Kitty keyboard: REPORT_TEXT (flag 16)	✓	✗	✓	✓	✗
Desktop Notifications (OSC 9/777)	✓	✗	~	~	✗
VS Code Shell Integration (OSC 633)	✓	✗	✗	✓	✗
Icon and title (OSC 0)	✓	✓	✓	✓	✓
Icon name (OSC 1)	✓	✓	✓	✓	✓
Foreground color query (OSC 10)	✓	✗	~	~	✗
Reset color palette (OSC 104)	✓	✗	✗	✗	✗
Background color query (OSC 11)	✓	✗	~	~	✗
Reset foreground color (OSC 110)	✓	✗	✗	✗	✗
Reset background color (OSC 111)	✓	✗	✗	✗	✗
Reset cursor color (OSC 112)	✓	✗	✗	✗	✗
Reset pointer fg color (OSC 113)	?	?	?	?	?
Reset pointer bg color (OSC 114)	?	?	?	?	?
Reset highlight background (OSC 117)	✓	✓	✓	✓	✓
Reset highlight foreground (OSC 119)	✓	✓	✓	✓	✓
Cursor color (OSC 12)	✓	✗	✗	✗	✗
OSC 133;A prompt start (FTCS_PROMPT)	✓	✓	✓	✓	✓
OSC 133;B command start (FTCS_COMMAND_START)	✓	✓	✓	✓	✓
OSC 133;C command executed (FTCS_COMMAND_EXECUTED)	✓	✓	✓	✓	✓
OSC 133;D command finished (FTCS_COMMAND_FINISHED)	✓	✓	✓	✓	✓
OSC 133;P properties	✓	✓	✓	✓	✓
iTerm2 Capability Reporting (OSC 1337)	✓	✗	✗	✗	✗
iTerm2 Cell Size Reporting (OSC 1337)	✓	✗	✗	✗	✗
Highlight background (OSC 17)	✓	✗	✗	✗	✗
Set Wayland app-id (OSC 176)	?	?	?	?	?
Highlight foreground (OSC 19)	✓	✗	✗	✗	✗
Window title (OSC 2)	✓	✓	✓	✗	✓
Kitty color protocol (OSC 21)	✓	✗	✗	✗	✗
Pointer shape (OSC 22)	?	?	?	?	?
Kitty color stack push (OSC 30001)	?	?	?	?	?
Systemd context (OSC 3008)	?	?	?	?	?
Kitty color stack pop (OSC 30101)	?	?	?	?	?
Color palette (OSC 4)	✓	✗	✗	✗	✗
Audio sound (OSC 440)	?	?	?	?	?
Special color (OSC 5)	✓	✗	✗	✗	✗
Clipboard access (OSC 52)	✓	✗	~	~	✗
OSC 52 clipboard read	✓	✗	~	~	✗
OSC 52 clipboard write	✓	✓	✓	✓	✓
OSC 5522 advanced clipboard	✓	✗	✗	✗	✗
Screen flash (OSC 555)	?	?	?	?	?
OSC 633;A prompt start	✓	✓	✓	✓	✓
OSC 633;B prompt end	✓	✓	✓	✓	✓
OSC 633;C pre-execution	✓	✓	✓	✓	✓
OSC 633;D command finished	✓	✓	✓	✓	✓
OSC 633;E set commandline	✓	✓	✓	✓	✓
OSC 633;P properties	✓	✓	✓	✓	✓
OSC 66 text sizing	✓	✗	✗	✗	✗
VTE termprop (OSC 666)	?	?	?	?	?
Current directory (OSC 7)	✓	✗	~	~	✗
Locale query/set (OSC 701)	?	?	?	?	?
Version query (OSC 702)	?	?	?	?	?
Set normal font (OSC 710)	?	?	?	?	?
Scroll view up (OSC 720)	?	?	?	?	?
Cell size report (OSC 776)	?	?	?	?	?
Notifications (OSC 777)	?	?	?	?	?
Font size query/set (OSC 7770)	?	?	?	?	?
Font + window size (OSC 7777)	?	?	?	?	?
Hyperlinks (OSC 8)	✓	✓	✓	✓	✗
OSC 9;4 progress bar	?	?	?	?	?
Desktop notifications (OSC 99)	?	?	?	?	?
Text reflow on resize	✓	✓	✓	✓	✗
Semantic prompts (OSC 133)	✓	✗	✗	✓	✗
Sixel graphics	✓	✗	✗	✓	✗
Sixel support in DA1	✓	✗	✗	~	✗
Sixel geometry report (CSI ? Pi;Pa;Pv S)	✓	✓	✗	✗	✓
24-bit truecolor	✓	✓	✓	✓	✗
Character Sets
DEC line drawing character set	✓	✓	✓	✓	✓
DEC Special Graphics	✓	✓	✓	✓	✓
G0/G1 character set switching	✓	✓	✓	✓	✓
UTF-8 mode	✓	✓	✓	✓	✓
Device Status
Mode Report (DECRPM)	✓	✓	~	~	✗
Request Setting (DECRQSS)	✓	✓	~	~	✗
DSR ?996 — color scheme query	?	?	?	?	?
COLORTERM env variable	?	?	?	?	?
KITTY_* env variables	?	?	?	?	?
LC_TERMINAL env variable	?	?	?	?	?
NO_COLOR env variable	?	?	?	?	?
TERM env variable	?	?	?	?	?
TERM_PROGRAM env variable	?	?	?	?	?
VTE_VERSION env variable	?	?	?	?	?
WEZTERM_* env variables	?	?	?	?	?
WT_SESSION env variable	?	?	?	?	?
Primary device attributes (DA1)	✓	~	~	~	✓
Secondary Device Attributes (DA2)	✓	✓	~	~	✗
Device status report (DSR 5)	✓	~	~	~	✓
Feature Reporting (TERM_FEATURES)	?	?	?	?	?
Tertiary Device Attributes (DA3)	✓	✗	~	~	✗
Query Terminfo (XTGETTCAP)	✓	✗	~	~	✗
XTGETXRES — query resource value (DCS + Q)	✓	✓	✗	✗	✗
XTREPORTCOLORS — report color capabilities (CSI # R)	✓	✓	✗	✗	✗
Terminal Version (XTVERSION)	✓	✗	~	~	✗
Report window size in pixels (CSI 14 t)	✓	~	~	~	✗
Report cell size in pixels (CSI 16 t)	✓	~	~	~	✗
Report text area size in chars (CSI 18 t)	✓	~	~	~	✗
Report icon label (CSI 20 t)	✓	~	✗	~	✗
Report window title (CSI 21 t)	✓	~	✗	~	✗
Push title/icon stack (CSI 22 ; 0 t)	✓	✓	✓	~	✓
Pop title/icon stack (CSI 23 ; 0 t)	✓	✓	✗	~	✓
Input Protocols
Button-Event Mouse (1002)	✓	✓	✓	✓	✗
CSI u Key Encoding	✓	✗	✓	✓	✗
Kitty click events	?	?	?	?	?
modifyOtherKeys	✓	✗	~	~	✗
modifyOtherKeys mode 3	✓	✗	~	~	✗
Pixel Mouse Reporting (1016)	✓	✗	~	~	✗
urxvt Mouse Reporting (1015)	✓	✗	✗	✗	✗
X10 Mouse Tracking (9)	✓	✓	✗	✗	✗
Unicode
East Asian Ambiguous Width	✓	✓	✓	✓	✓
Grapheme Cluster Cursor Movement	✓	✓	✓	✓	✓
Tab Stops (HT)	✓	✓	✓	✓	✓
Wide Char at Line Wrap	✓	✓	✓	✗	✗

Multiplexers

Which features survive tmux and screen? Pass-through testing shows what each multiplexer correctly relays.

tmux3.6a

86%219 / 254

GNU Screen4.00.03

68%171 / 251

	tmux	GNU Screen
SGR (Text Styling)
256-color bg (SGR 48;5)	✓	✓
Bright bg colors (SGR 100-107)	✓	✓
Default bg color (SGR 49)	✓	✓
Standard bg colors (SGR 40-47)	✓	✓
24-bit bg (SGR 48;2)	✓	✓
Blink (SGR 5)	✓	✓
Bold (SGR 1)	✓	✓
Faint/dim (SGR 2)	✓	✓
256-color fg (SGR 38;5)	✓	✓
Bright fg colors (SGR 90-97)	✓	✓
Default fg color (SGR 39)	✓	✓
Standard fg colors (SGR 30-37)	✓	✓
24-bit fg (SGR 38;2)	✓	✓
Hidden/invisible (SGR 8)	✓	✓
Inverse video (SGR 7)	✓	✓
Italic (SGR 3)	✓	✓
Overline (SGR 53)	✓	✓
Reset all (SGR 0)	✓	✓
Reset bold/dim (SGR 22)	✓	✓
Reset inverse (SGR 27)	✓	✓
Reset italic (SGR 23)	✓	✓
Reset underline (SGR 24)	✓	✓
Strikethrough (SGR 9)	✓	✓
Underline color, indexed (SGR 58;5)	✓	✓
Reset underline color (SGR 59)	✓	✓
Underline color, truecolor (SGR 58;2)	✓	✓
Underline color (SGR 58)	✓	✓
Curly underline (SGR 4:3)	✓	✓
Dashed underline (SGR 4:5)	✓	✓
Dotted underline (SGR 4:4)	✓	✓
Double underline (SGR 21)	✓	✓
Underline (SGR 4)	✓	✓
Cursor
ANSI restore cursor (CSI u)	✓	✗
ANSI save cursor (CSI s)	✓	✗
CPL cursor preceding line (CSI F)	✓	✗
CUD stops at bottom	✓	✗
CUP at screen boundaries	✗	✓
CUP with DECOM	✓	✗
CUU stops at top	✓	✓
Hide cursor (DECTCEM)	✓	✓
Cursor horizontal absolute (CHA)	✓	✗
HPA horizontal position absolute (CSI `)	✓	✗
Cursor position (CUP)	✓	✗
Cursor back (CUB)	✓	✓
Cursor down (CUD)	✓	✗
Cursor forward (CUF)	✓	✗
Cursor home	✓	✗
Cursor up (CUU)	✓	✗
Cursor next line (CNL)	✓	✗
Cursor position report (DSR 6)	✓	✗
Reverse Wrap (Mode 45)	✓	✓
Save/restore cursor (DECSC)	✓	✗
Cursor shape (DECSCUSR)	✓	✓
VPA vertical position absolute (CSI d)	✓	✗
Text
Backspace (BS)	✓	✗
Basic text rendering	✓	✗
CBT backward tab (CSI Z)	✗	✗
CHT forward tab (CSI I)	✗	✗
Combining characters (0 cols)	✓	✓
Carriage return	✓	✗
HTS set tab stop (ESC H)	✓	✗
Index (IND)	✓	✗
Line feed	✓	✗
Next line (NEL)	✓	✗
Overwrite at cursor	✓	✗
Reverse Index at Scroll Top	✓	✗
Tab stops	✓	✗
TBC clear tab stop (CSI g)	✗	✗
CJK wide chars (2 cols)	✓	✗
Emoji wide chars (2 cols)	✓	✗
Regional indicator flags (2 cols)	✓	✗
Variation selector 16 (emoji presentation)	✓	✗
Emoji ZWJ sequences (2 cols)	✓	✗
Text wraps at width	✓	✗
Erase
Erase character (ECH)	✓	✗
ED at scroll region boundary	✓	✓
EL erases with bg color	✓	✓
Erase line (EL 2)	✓	✗
Erase to BOL (EL 1)	✓	✗
Erase to EOL (EL 0)	✓	✗
Erase above (ED 1)	✓	✗
Erase screen (ED 2)	✓	✗
Erase below (ED 0)	✓	✗
Erase scrollback (ED 3)	✓	✗
Selective Erase (DECSED)	✓	✓
Editing
DECCARA — change attrs in rectangle	✓	✓
DECCRA — copy rectangular area	✓	✓
DECDC — delete columns (CSI Ps ' ~)	✓	✓
DECERA — erase rectangular area	✓	✓
DECFRA — fill rectangular area	✓	✓
DECIC — insert columns (CSI Ps ' })	✓	✓
DECRARA — reverse attrs in rectangle	✓	✓
DECRQCRA — checksum rectangular area	✗	✓
DECSACE — select attribute-change extent	✓	✓
DECSERA — selective erase rectangular area	✓	✓
Delete characters (DCH)	✓	✗
Delete lines (DL)	✓	✗
Insert characters (ICH)	✓	✓
Insert lines (IL)	✓	✗
Repeat character (REP)	✓	✗
SL — shift left (CSI Ps SP @)	✓	✓
SR — shift right (CSI Ps SP A)	✓	✓
Modes
Enter alt screen (DECSET 1049)	✓	✓
Exit alt screen (DECRST 1049)	✓	✓
Alt-scroll mouse wheel (?1007)	✓	✓
Alt screen clear-on-enter (?1047)	✓	✓
Save/restore cursor (?1048)	✗	✓
Alt screen legacy (?47)	✓	✓
App cursor keys (DECCKM)	✓	✓
Application keypad (DECKPAM)	✓	✓
Auto-wrap (DECAWM)	✓	✓
Bracketed paste (DECSET 2004)	✓	✓
Mode 2031 color scheme reporting	✓	✓
DECCOLM 80/132 column switch (?3)	✓	✓
DECSCLM — smooth scroll mode	?	?
DECSSCLS — set scroll speed	?	?
Focus tracking (DECSET 1004)	✓	✓
Insert/replace mode (IRM)	✓	✓
Left/Right Margins (DECLRMM, Mode 69)	✓	✓
All motion mouse (DECSET 1003)	✓	✓
SGR mouse mode (DECSET 1006)	✓	✓
Mouse tracking (DECSET 1000)	✓	✓
Origin mode (DECOM)	✗	✓
Reverse video (DECSCNM)	✓	✓
Synchronized output (DECSET 2026)	✓	✓
UTF-8 mouse mode (?1005)	✓	✓
Pop color palette (CSI # Q)	✓	✓
XTPOPSGR — pop SGR stack (CSI # })	✓	✓
Push color palette (CSI # P)	✓	✓
XTPUSHSGR — push SGR stack (CSI # {)	✓	✓
XTRESTORE — restore DEC private modes (CSI ? Pm r)	✓	✓
XTSAVE — save DEC private modes (CSI ? Pm s)	✓	✓
Scrollback
Scrollback accumulates	✓	✓
Alt screen separate scrollback	✓	✓
DECSTBM constrains scrolling	✓	✓
DECSTBM reset to full screen	✓	✗
Reverse index (RI)	✓	✗
Scroll down (SD)	✓	✓
Scroll up (SU)	✓	✗
Scroll region (DECSTBM)	✓	✓
Total line count	✓	✓
Reset
DECALN screen alignment (ESC # 8)	✓	✓
Backend reset() method	✓	✓
Full reset (RIS)	✓	✓
SGR reset clears attributes	✓	✗
Soft reset (DECSTR)	✓	✓
Extensions
System clipboard paste	?	?
Font ligatures	?	?
iTerm2 Inline Images (OSC 1337)	✓	✓
Kitty graphics protocol	✗	✓
Kitty graphics: animation	✓	✓
Kitty graphics: display	✗	✓
Kitty graphics: transmit	✓	✓
Kitty graphics: Unicode placeholders	✗	✗
Kitty keyboard protocol	✗	✓
Kitty keyboard: DISAMBIGUATE (flag 1)	✗	✓
Kitty keyboard: REPORT_ALL_KEYS (flag 8)	✗	✗
Kitty keyboard: REPORT_ALTERNATE (flag 4)	✗	✗
Kitty keyboard: REPORT_EVENTS (flag 2)	✗	✗
Kitty keyboard: REPORT_TEXT (flag 16)	✗	✗
Desktop Notifications (OSC 9/777)	✓	✓
VS Code Shell Integration (OSC 633)	✓	✓
Icon and title (OSC 0)	✓	✓
Icon name (OSC 1)	✓	✓
Foreground color query (OSC 10)	✗	✓
Reset color palette (OSC 104)	✓	✓
Background color query (OSC 11)	✗	✗
Reset foreground color (OSC 110)	✓	✓
Reset background color (OSC 111)	✓	✓
Reset cursor color (OSC 112)	✓	✓
Reset pointer fg color (OSC 113)	✓	✓
Reset pointer bg color (OSC 114)	✓	✓
Reset highlight background (OSC 117)	✓	✓
Reset highlight foreground (OSC 119)	✓	✓
Cursor color (OSC 12)	✗	✗
OSC 133;A prompt start (FTCS_PROMPT)	✓	✗
OSC 133;B command start (FTCS_COMMAND_START)	✓	✗
OSC 133;C command executed (FTCS_COMMAND_EXECUTED)	✓	✓
OSC 133;D command finished (FTCS_COMMAND_FINISHED)	✓	✓
OSC 133;P properties	✓	✓
iTerm2 Capability Reporting (OSC 1337)	✗	✗
iTerm2 Cell Size Reporting (OSC 1337)	✗	✗
Highlight background (OSC 17)	✗	✓
Set Wayland app-id (OSC 176)	✓	✓
Highlight foreground (OSC 19)	✗	✓
Window title (OSC 2)	✓	✓
Kitty color protocol (OSC 21)	✓	✓
Pointer shape (OSC 22)	✓	✓
Kitty color stack push (OSC 30001)	✓	✓
Systemd context (OSC 3008)	✓	✓
Kitty color stack pop (OSC 30101)	✓	✓
Color palette (OSC 4)	✗	✓
Audio sound (OSC 440)	✓	✓
Special color (OSC 5)	✗	✗
Clipboard access (OSC 52)	✓	✓
OSC 52 clipboard read	✗	✓
OSC 52 clipboard write	✓	✓
OSC 5522 advanced clipboard	✗	✗
Screen flash (OSC 555)	✓	✓
OSC 633;A prompt start	✓	✓
OSC 633;B prompt end	✓	✓
OSC 633;C pre-execution	✓	✓
OSC 633;D command finished	✓	✓
OSC 633;E set commandline	✓	✓
OSC 633;P properties	✓	✓
OSC 66 text sizing	✓	✓
VTE termprop (OSC 666)	✓	✓
Current directory (OSC 7)	✓	✓
Locale query/set (OSC 701)	✓	✓
Version query (OSC 702)	✓	✓
Set normal font (OSC 710)	✓	✓
Scroll view up (OSC 720)	✓	✓
Cell size report (OSC 776)	✓	✓
Notifications (OSC 777)	✓	✓
Font size query/set (OSC 7770)	✓	✓
Font + window size (OSC 7777)	✓	✓
Hyperlinks (OSC 8)	✓	✗
OSC 9;4 progress bar	✓	✓
Desktop notifications (OSC 99)	✓	✓
Text reflow on resize	✓	✓
Semantic prompts (OSC 133)	✓	✓
Sixel graphics	✓	✗
Sixel support in DA1	✓	✓
Sixel geometry report (CSI ? Pi;Pa;Pv S)	✓	?
24-bit truecolor	✓	✗
Character Sets
DEC line drawing character set	✓	✗
DEC Special Graphics	✓	✗
G0/G1 character set switching	✓	✗
UTF-8 mode	✓	✗
Device Status
Mode Report (DECRPM)	✗	✗
Request Setting (DECRQSS)	✓	✓
DSR ?996 — color scheme query	?	?
COLORTERM env variable	?	?
KITTY_* env variables	?	?
LC_TERMINAL env variable	?	?
NO_COLOR env variable	?	?
TERM env variable	?	?
TERM_PROGRAM env variable	?	?
VTE_VERSION env variable	?	?
WEZTERM_* env variables	?	?
WT_SESSION env variable	?	?
Primary device attributes (DA1)	✓	✓
Secondary Device Attributes (DA2)	✓	✓
Device status report (DSR 5)	✓	✓
Feature Reporting (TERM_FEATURES)	✗	✓
Tertiary Device Attributes (DA3)	✗	✓
Query Terminfo (XTGETTCAP)	✗	✗
XTGETXRES — query resource value (DCS + Q)	✗	?
XTREPORTCOLORS — report color capabilities (CSI # R)	✗	?
Terminal Version (XTVERSION)	✓	✗
Report window size in pixels (CSI 14 t)	✓	✓
Report cell size in pixels (CSI 16 t)	✓	✗
Report text area size in chars (CSI 18 t)	✓	✓
Report icon label (CSI 20 t)	✗	✓
Report window title (CSI 21 t)	✗	✗
Push title/icon stack (CSI 22 ; 0 t)	✓	✓
Pop title/icon stack (CSI 23 ; 0 t)	✓	✓
Input Protocols
Button-Event Mouse (1002)	✓	✓
CSI u Key Encoding	✓	✓
Kitty click events	?	?
modifyOtherKeys	✓	✓
modifyOtherKeys mode 3	✓	✓
Pixel Mouse Reporting (1016)	✓	✓
urxvt Mouse Reporting (1015)	✓	✓
X10 Mouse Tracking (9)	✓	✓
Unicode
East Asian Ambiguous Width	✓	✗
Grapheme Cluster Cursor Movement	✓	✗
Tab Stops (HT)	✓	✗
Wide Char at Line Wrap	✓	✗

Explore

Fundamentals

How terminals work — control characters, PTY architecture, stty, and feature detection.

Standards

From VT100 to Kitty — 50 years of terminal protocols and escape sequence standards.

Historical Terminals

The terminals that shaped computing — VT52, VT100, VT220, xterm, and VT510.

Baselines

What should your terminal support? Minimum feature sets from core to rich.

Glossary

CSI, SGR, OSC, DEC... terminal terminology explained.

Compare

Side-by-side terminal feature comparison.

How This Works

Data comes from three complementary sources:

Terminal Applications — tested on real terminals via the npx terminfo.dev community CLI. Each test sends escape sequences to the actual terminal and verifies behavior via cursor position reports, device attribute queries, and rendered width measurements. These results reflect what users actually experience.

Headless Backends — tested via Termless against headless terminal emulator libraries. These test parser correctness — whether the library correctly parses and stores the escape sequence. A headless pass means "the parser accepts this," not "this renders correctly." Some features (like blink, cursor shape) may parse correctly but are not exposed through the library's API.

Multiplexers — tested by running probes through terminal multiplexers (tmux, screen) to measure pass-through fidelity. A multiplexer pass means the escape sequence was correctly relayed to the underlying terminal. Failures indicate sequences that the multiplexer intercepts, strips, or mishandles.