See https://www.w3.org/Bugs/Public/show_bug.cgi?id=15489#c37 why `type=email` is restrictive. Adding an attribute to make it less restrictive is still desired, but nobody has really come up with an appropriate definition. https://github.com/whatwg/html/issues/4089 is somewhat related.
(Extensibility is also slowly being tackled as part of web components.)
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