The enterkeyhint content attribute is an enumerated attribute that specifies what action label (or icon) to present for the enter key on virtual keyboards. This allows authors to customize the presentation of the enter key in order to make it more helpful for users.
To be able to build rich applications that customize the enter key.
Docs: https://html.spec.whatwg.org/multipage/interaction.html#input-modalities:-the-enterkeyhint-attribute
Samples: http://output.jsbin.com/mukira
Explainers: https://dtapuska.github.io/enterkeyhint/