Features›Device Status

Device Status

Device attributes and status reporting sequences. Applications use DA1 (Device Attributes) to identify terminal type and capabilities, and DSR (Device Status Report) to query cursor position and terminal health. These query-response sequences are essential for terminal capability detection and are used by shell integration, TUI frameworks, and terminal multiplexers. Device attribute queries are the terminal's self-identification mechanism. DA1 has been the standard "who are you?" query since the VT100, but its response is a mess: most modern terminals identify as "VT220" regardless of actual capabilities — Ghostty, Kitty, WezTerm, and foot all respond with the same VT220 code that an actual 1983 DEC terminal would. The real capability detection happens via DECRPM (query individual modes) and XTVERSION (query the actual terminal name). This is why feature detection beats terminal identification.

28 features in this category

Analysis2026-04-06

The Device Status category covers 25 features. Top performers (100%): WezTerm. Common gaps: Tertiary Device Attributes (DA3) (8 terminals fail), Query Terminfo (XTGETTCAP) (7 terminals fail), Feature Reporting (TERM_FEATURES) (6 terminals fail).

Terminal Applications

Feature	iTerm2	Ghostty	VS Code	Warp	Cursor	Terminal.app
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)	✓	✓	✓	✓	✓	✓

Headless Backends

Parser correctness tested via Termless. A ✓ means the parser accepts the sequence, not that it renders correctly.

Feature	vterm	xterm.js	Kitty	Alacritty	WezTerm	vt100.js
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)	✓	✓	~	✗	~	✓

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