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Using a three-dimensional formalism that includes relativistic kinematics,the effects of negative-energy states, approximate boosts of the two-bodysystem, and current conservation, we calculate the electromagnetic form factorsof the deuteron up to Q^2 of 4 GeV^2. This is done using a dynamical boost fortwo-body systems with spin. We first compute form factors in impulseapproxmation, but then also add an isoscalar meson-exchange current of pionrange that involves the gamma-pi contact operator associated with pseudovectorpi-N coupling. We also consider effects of the rho-pi-gamma meson-exchangecurrent. The experimentally measured quantities A, B, and t20 are calculatedover the kinematic range probed in recent Jefferson Laboratory experiments. Therho-pi-gamma meson-exchange current provides significant strength in A at largeQ^2 and the gamma-pi contact-term exchange current shifts t20, providing goodagreement with the JLab data. Relativistic effects and the gamma-pimeson-exchange current do not provide an explanation of the B observable, butthe rho-pi-gamma current could help to provide agreement if a nonstandard valueis used for the tensor rho-N coupling that enters this contribution.Comment: 15 pages, 10 figures. (v2) Added references on rho-pi-gamma current  as well as comparison to recent Novosibirsk data on T20. Implemented  \includegraphics in place of \BoxedEPSF. (v3) Modified in order to clarify  the nature of the boost we implemented for particles with spin. Other minor  changes. Version to be published in Physical Review

Electron-deuteron scattering in the equal-time formalism: Beyond the impulse approximation