Specification: https://html.spec.whatwg.org/multipage/forms.html
Multipage: https://html.spec.whatwg.org/multipage/#text-(type=text)-state-and-search-state-(type=search)
Complete: https://html.spec.whatwg.org/#text-(type=text)-state-and-search-state-(type=search)
Referrer: 

Comment:
Why was the multiple attribute chosen as a ‘must not be specified’ in this
spec?

Reason I query it, was hoping to gives users the ability to autocomplete
nicknames/handles to reference others without needing to dip into javascript,
and this pattern that already exists for input[type=file], input[type=email]
seems obviously reusable.

Browsers like Chrome validate datalists for email, so automatically reject
content such as "@user"

It is fairly common, with examples such as Twitter, Twitch chat, Web IM, and
most collab tools, to highlight user(s) by name with tab completion.

-jdw

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