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This contribution briefly illustrates preliminary calculations of the electromagnetic form factors of $^3$He and $^3$H, obtained within the Light-front Relativistic Hamiltonian Dynamics, adopting i) a Poincar\'e covariant current operator, without dynamical two-body currents, and ii) realistic nuclear bound states with $S$, $P$ and $D$ waves. The kinematical region of few $(GeV/c)^2$, relevant for forthcoming TJLAB experiments, has been investigated, obtaining possible signatures of relativistic effects for $Q^2>2.5 ~(GeV/c)^2$., Comment: 8 Pages, 7 figures, aipproc.cls included. Proceedings of VIth Intl. Conf. on "Perspectives in Hadronic Physics", Trieste, May 2008. AIP series

We present a preliminary calculation of the electromagnetic form factors of $^3$He and $^3$H, performed within the Light-Front Hamiltonian Dynamics. Relativistic effects show their relevance even at the static limit, increasing at higher values of momentum transfer, as expected., Comment: 6 pages, 4 figures. Proceedings of 20th European Conference on Few-Body Problems in Physics; to be published in Few-Body Systems