The Ada library passes the full range of tests from the specification, across a wide range of platforms (e.g., Windows, Linux, macOS). It fully supports the relevant *Unicode Technical Standard* https://www.unicode.org/reports/tr46/#ToUnicode.
A common use of a URL parser is to take a URL string and normalize it.
The WHATWG URL specification has been adopted by most browsers. Other tools, such as curl and many standard libraries, follow the RFC 3986. The following table illustrates possible differences in practice (encoding of the host, encoding of the path):