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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Actually it's https://www.w3.org/
Fixed. Thank you for reporting this issue.
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Agreed, and I think another interesting case will be 'https://www.org' from the World Wide Web Consortium
Also thought of this approach until I realised that the World Wide Web Consortium is owner of 'https://www.org'. Your code will return the top level domain instead of the domain.