Hey netizens, do me a favour: if you have a site and it has a newsfeed (#RSS or #Atom), please check it with https://validator.w3.org/feed/ If it fails the validation, please tell the author of your software about it. If you're the author and you don't understand what the validator is telling you, comment here and I'll try to help (others are welcome to help too!)

The world is full of slightly broken feeds. Let's make it a better place.