  The emergence of near-ambient temperature superconductivity under pressure in
the metal hydride systems has motivated a desire to further understand such
remarkable properties, specifically critical magnetic fields. YH$_6$ is
suggested to be a departure from conventional superconductivity, due to
apparent anomalous behavior. Using density functional calculations in
conjunction with Migdal-Eliashberg theory we show that in YH$_6$ the critical
temperature and the isotope effect under pressure, as well as the high critical
fields, are consistent with strong-coupling conventional superconductivity; a
property anticipated to extend to other related systems. Furthermore, the
strong-coupling corrections occur to the expected BCS values for the
Ginzburg-Landau parameter ($\kappa_{1}(T)$), London penetration depth
($\lambda_{L}(T)$), electromagnetic coherence length ($\xi(T)$), and the energy
gap ($\Delta_{0}$).
