  A Poincar\'e-covariant quark+diquark Faddeev equation is used to compute
nucleon elastic form factors on $0\leq Q^2\leq 18 \,m_N^2$ ($m_N$ is the
nucleon mass) and elucidate their role as probes of emergent hadronic mass in
the Standard Model. The calculations expose features of the form factors that
can be tested in new generation experiments at existing facilities, e.g. a zero
in $G_E^p/G_M^p$; a maximum in $G_E^n/G_M^n$; and a zero in the proton's
$d$-quark Dirac form factor, $F_1^d$. Additionally, examination of the
associated light-front-transverse number and anomalous magnetisation densities
reveals, inter alia: a marked excess of valence $u$-quarks in the neighbourhood
of the proton's centre of transverse momentum; and that the valence $d$-quark
is markedly more active magnetically than either of the valence $u$-quarks. The
calculations and analysis also reveal other aspects of nucleon structure that
could be tested with a high-luminosity accelerator capable of delivering higher
beam energies than are currently available.
