Ladybird is a full-featured web browser engine implemented primarily in C++ with Rust components for performance-critical tasks. It includes its own JavaScript engine (LibJS) with bytecode interpreter and JIT compiler (Flap), a rendering engine (LibWeb) that implements HTML, CSS, DOM, SVG, WebGL, WebAudio, and many other web standards, a graphics library (LibGfx) with Skia integration, a media pipeline (LibMedia) supporting audio/video decoding via FFmpeg, and a custom garbage collector (LibGC). The architecture is multi-process: separate processes for UI, web content, image decoding, networking, and compositing, communicating via a custom IPC framework (LibIPC). The codebase is actively developed with a strong focus on web standards compliance, evidenced by extensive test suites including imported Web Platform Tests (WPT). It is not a data research project; it is a production-quality browser engine designed for the Ladybird browser, with cross-platform support for Linux, macOS, and Android.