Registry status
Reserved. #778899 is the CSS named color “light slate gray”, one of a small set we keep out of the registry so no single person holds it.
See #7C8394, which looks the same and can be registeredReference names
Names this exact code carries in public color lists. They are reference data, not registrations, and this code itself is reserved, so it can't be registered.
- lightslategrayReference name · CSS named colors (Public specification)
- SomnambulistReference name · color-names (MIT)