It is using a lot of external libraries[1], the major one being the spidermonkey javascript engine. The Python is used for a pile of code generation, although,

It is using a lot of external libraries[1], the major one being the spidermonkey javascript engine. The Python is used for a pile of code generation, although, AIUI, the Servo team are using more and more Rust macros. [1]: most of these directories contain submodules pointing to Rust wrappers around other libraries: https://github.com/mozilla/servo/tree/master/src/support https://github.com/mozilla/servo/tree/master/src/support [2]: https://github.com/mozilla/servo/tree/master/src/components/script/dom/bindings/codegen https://github.com/mozilla/servo/tree/master/src/components/...