Tanisaki witness relations for harmonic differential forms

Inspired by a series of conjectures related to higher coinvariant algebras, we present two families of relations involving harmonic differential forms of the symmetric group. Our relations, together with a novel bijection, are sufficient to give a filtration of the $1$-forms suggested by work of Haglund--Rhoades--Shimozono with composition factors given by Tanisaki quotients. These are "almost all" of the necessary relations in a certain asymptotic sense we make precise.