1) The document discusses experiments testing how websites load over IPv6-only, NAT64, and DNS64 environments. It describes a public test bed and tool called NAT64Check that allows testing websites across different IPv6 transition technologies. 2) Issues found in real-world testing are discussed, such as invalid AAAA records causing problems. The document provides examples of DNS64 and NAT64 configurations used to filter out invalid records. 3) NAT64Check is described as a tool that tests websites from IPv4-only, IPv6-only, and NAT64-translated perspectives to identify loading issues and calculate a score. The code is open source and available on GitHub to allow others to use and contribute to