Summary: Pull Request resolved: https://github.com/facebook/yoga/pull/1715 X-link: https://github.com/facebook/react-native/pull/46799 Content box impl had a bug where we resolved padding % against the same reference length as the dimensions. Padding should always be against containing block's width. This is also true for width, but not for height, which should be against containing block's height. This just pipes the width into our box sizing functions. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D63787577 fbshipit-source-id: e512338770f25b66506cabab5a7cde8f04397ea0