The source of truth for css-layout is: https://github.com/facebook/css-layout The code here should be kept in sync with GitHub. HEAD at the time this code was synced: https://github.com/facebook/css-layout/commit/383d8a6b3dcbdb978e012e29040e1a43157765c6 There is generated code in: - README.facebook (this file) - java/com/facebook/csslayout (this folder) - javatests/com/facebook/csslayout The code was generated by running 'make' in the css-layout folder and running: ./syncFromGithub.sh