Kitty Extensions

Extensions introduced by the Kitty terminal emulator. The Kitty keyboard protocol provides unambiguous, modifier-aware key reporting that solves longstanding terminal input limitations (distinguishing Ctrl+I from Tab, reporting key release events). The Kitty graphics protocol enables inline image display via a chunked base64 transfer mechanism. Kitty also introduced extended underline styles (curly, dotted, dashed) with configurable colors. These protocols are adopted by Ghostty, WezTerm, foot, and other modern terminals.

5 features in this category

Support Matrix

Feature	Ghostty	WezTerm	Alacritty	vt100	xterm.js	Kitty
Curly underline (SGR 4:3)	✓	✓	✓	✓	✗	✓
Dotted underline (SGR 4:4)	✓	✓	✓	✓	✗	✓
Dashed underline (SGR 4:5)	✓	✓	✓	✓	✗	✓
Kitty keyboard protocol	✓	✓	✓	✗	✗	✓
Kitty graphics protocol	✓	✗	✗	✗	✗	✓

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