css-layout is currently in the process of big changes. If you are looking at using the latest stable version please have a look at the `deprecated` branch. This includes a js version and a C-sharp version not currently available on master.
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CSSLayout is a cross platform implementation of the flexbox specification. CSSLayout targets native mobile development and is therefor disconnected from the web browser. CSSLayout is implemented in C for portability reasons and uses JNI to expose public methods to Java.
See CSSLayout/CSSLayout.h for a look at the public API being exposed.