https://experienceleaguecommunities.adobe.com/adobe-marketo-engage-general-27/support-nested-fieldsets-in-forms-2-0-242123
Support Nested Fieldsets in Forms 2.0 | Adobe Experience League Community
Straightforward request: both the W3C and WHATWG consider nested fieldsets to be valid HTML. https://dev.w3.org/html5/spec-LC/forms.html#the-fie...
supportnestedfieldsetsformsadobe