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Predicting magic wavelengths accurately requires precise knowledge ofelectric-dipole matrix elements of nearby atomic transitions. As a result,measurements of magic wavelengths allow us to test theoretical predictions forthe matrix elements that frequently can not be probed by any other methods.Here, we calculate and measure a magic wavelength near $473$ nm of the$5s^2\,^1\!S_0 - 5s5p\,^3\!P_1$ intercombination transition of ${}^{88}$Sr.Experimentally, we find $473.361(4)$ nm for $\Delta m=0$ ($\pi$ transition) and$473.133(14)$ nm for $\Delta m=-1$ ($\sigma^{-}$ transition). Theoreticalcalculations yield $473.375(22)$~nm and $473.145(20)$ nm, respectively. The$^3\!P_1$ polarizability is dominated by the contributions to the $5p^2\,^3\!P$ levels and excellent agreement of theory and experiment validates boththeoretical values of these matrix elements and estimates of theiruncertainties.

Magic wavelengths of the Sr ($5s^2\;^1\!S_0$--$5s5p\;^3\!P_1$) intercombination transition near the $5s5p\;^3\!P_1$--$5p^2\;^3\!P_2$ transition