Using qualified names is actually it good idea (similar to svg there could be a custom namespace for mizu) It'll kind of solve the previous commenter concerns

Using qualified names is actually it good idea (similar to svg there could be a custom namespace for mizu) It'll kind of solve the previous commenter concerns about with writing invalid html. While namespaces are more a xml thing, there are probably many benefits to this approach like querying all attributes from the namespace at once too. I'll keep this in mind for future iterations!