  We study the electromagnetic form factors, decay constants and charge radii
of the pion and kaon within the framework of light-front field theory formalism
where we use an ansatz for the quark-meson interaction bound-state function
which is symmetric under exchange of quark and antiquark momentum. The above
mentioned observables are evaluated for the $+$ component of the
electromagnetic current, $J^+$, in the Breit frame. We also check the
invariance of these observables in other frames, whereby both the valance and
the non-valence contributions have to be taken into account, and study the
sensitivity of the electromagnetic form factors and charge radius to the
model's parameters; namely, the quark masses, $m_u=m_d$, $m_{\bar s}$, and the
regulator mass, $m_R$. It is found that after a fine tuning of the regulator
mass, i.e. $m_R=0.6$ GeV, the model is suitable to fit the available
experimental data within the theoretical uncertainties of both the pion and
kaon.
