(A) a linear or substantially linear polydiorganosiloxane polymer having at least two aliphatically unsaturated hydrocarbon groups per molecule comprising unit formula (R⁴₃SiO_1/2)_m(R⁴₂R³SiO_1/2)_n(R⁴₂SiO_2/2)_o(R⁴R³SiO_2/2)_p(R⁴SiO_3/2)_q(R³SiO_3/2)_r(SiO_4/2)_s, where each R⁴ is an independently selected monovalent hydrocarbon group that is free of aliphatic unsaturation and each R³ is an independently selected aliphatically unsaturated monovalent hydrocarbon group, subscripts m, n, o, p, q, r, and s represent numbers of each unit and have values such that 0≤m, 0≤n, a quantity (m+n)≥2; 0<o<10,000, p≥0, a quantity (o+p) is 100 to 10,000; 0≤q≤100, 0≤r≤100, and 0≤s≤100; with the proviso that if any one or more of subscript q, r, or s is greater than 0, then a ratio (o+p)/(q+r+s) is 50/1 to 10,000/1;

(B) a (meth)acryloxyalkyl-functional polyorganosiloxane resin comprising unit formula (R¹₃SiO_1/2)_a(R¹₂R²SiO_1/2)_b(R¹R²SiO_2/2)_c(R¹₂SiO_2/2)_d(R²SiO_3/2)_e(R¹SiO_3/2)_f(SiO_4/2)_g(ZO_1/2)_h, where each R¹ is an independently selected monovalent hydrocarbon group, each R² is an independently selected (meth)acryloxyalkyl group, each Z is independently selected from the group consisting of hydrogen and an alkyl group of 1 to 6 carbon atoms, subscripts a, b, c, d, e, f, g, and h represent relative molar amounts of each unit and have values such that subscript a≥0, subscript b≥0, subscript c≥0, subscript d≥0, subscript e≥0, subscript f≥0, subscript g≥0, subscript h≥0, and a quantity (a+b+c+d+e+f+g+h)=100; with the provisos that 10≥(b+c+e)≥0.5 and 99.5>(f+g)≥30; where starting materials (A) and (B) are present in the composition in amounts sufficient to provide a weight ratio of (B) resin/(A) polymer (resin/polymer ratio) of 0.15/1 to <22/1;

(C) a polyorganohydrogensiloxane comprising unit formula (R⁵₃SiO_1/2)_t(R⁵₂HSiO_1/2)_u(R⁵₂SiO_2/2)_v(R⁵HSiO_2/2)_w(R⁵SiO_3/2)_x(HSiO_3/2)_y(SiO_4/2)_z, where each R⁵ is an independently selected monovalent hydrocarbon group, subscripts t, u, v, w, x, y, and z represent numbers of each unit in the formula and have values such that t≥0, u≥0, v≥0, w≥0, x≥0, y≥0, z≥0, a quantity (u+w+y)≥2, and 2,000≥(t+u+v+w+x+y+z)≥3; where the polyorganohydrogensiloxane is present in an amount sufficient to provide a molar ratio of silicon bonded hydrogen atoms in starting material (C) to reactive groups (SiH/reactive group ratio) of 0.05/1 to 2/1, where the reactive groups are, collectively, the aliphatically unsaturated monovalent hydrocarbon group and the (meth)acryloxyalkyl groups;

(D) a hydrosilylation reaction catalyst in an amount sufficient to provide 1 ppm to 1,000 ppm of a platinum group metal based on combined weights of starting materials (A), (B), (C), (D), (E), and (F) in the composition;

(E) a photoradical initiator in an amount sufficient to provide 0.01 weight % to 10 weight % based on combined weights of starting materials (A), (B), (C), (D), (E), and (F) in the composition;

(F) a hydrosilylation reaction inhibitor in an amount sufficient to provide 5 ppm to 2 weight % based on combined weights of starting materials (A), (B), (C), (D), (E), and (F) in the composition;

optionally (G) a radical scavenger; and

optionally (H) a solvent;