dart-sdk/third_party/mdn/browser-compat-data
..
README.google

Name: mdn-browser-compat-data
Short Name: mdn-browser-compat-data
URL: https://github.com/mdn/browser-compat-data
Version: 1.0.22
Date: May 26th 2020
License: Creative Commons Zero v1.0 Universal

Description:
This repository contains compatibility data for Web technologies. The files were
fetched from: https://github.com/mdn/browser-compat-data/tree/v1.0.22 on
May 26th 2020.