So Infopath 2013 is supported in 2016, but SharePoint really needs a full modern full-featured forms editor. FoSL looks promising but the functionality is not clear at this time.508 votesboom! it's done · AdminSharePoint Experiences Team (email@example.com, Microsoft SharePoint) responded
As announced at Ignite 2017 – we are releasing support for custom form creation in SharePoint using PowerApps. This capability is rolling out to PROD now. For more details, check out: https://myignite.microsoft.com/sessions/53854?source=sessions and https://techcommunity.microsoft.com/t5/Microsoft-Ignite-Content-2017/Transforming-business-processes-into-Microsoft-PowerApps-and/m-p/99249#M782
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