Summary: Pull Request resolved: https://github.com/facebook/yoga/pull/1485 X-link: https://github.com/facebook/react-native/pull/41686 The size of the containing block is the size of the padding box of the containing node for absolute nodes. We were looking at `containingNode->getLayout().measuredDimension(Dimension::Width)` which is the border box. So we need to subtract the border from this. Added a test that was failing before this change as well Reviewed By: NickGerleman Differential Revision: D51330526 fbshipit-source-id: adc448dfb71b54f1bbed0d9d61c5553bda4b106c