Unfortunately, some other jurisdictions don't have a concept of "public domain" works. That's why the page indicates "... this project is in the public domain

Unfortunately, some other jurisdictions don't have a concept of "public domain" works. That's why the page indicates "... this project is in the public domain within the United States." in its license [1]. But you answered the main point of my question, so thanks! [1] https://github.com/18F/web-design-standards/blob/develop/LICENSE.md#the-rest-of-this-project-is-in-the-worldwide-public-domain https://github.com/18F/web-design-standards/blob/develop/LIC...