Are button html tags outside of a form valid?

Hayalet65

New Member
I just noticed that, in soundcloud, the "action" buttons on a track (like, repost, etc...) are all html button tags. Moreover, they are neither inside a form nor they bind to a form a la html5 nor submit a form (they apparently are being handled through javascript). Is this valid HTML? Can a button exist without a form? Or does that just make these buttons plain clickable divs? And how valid/unvalid would that be for screenreaders?
 
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