Measurements of properties of the Higgs boson decaying to a W boson pair in pp collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn><mml:mspace width="0.25em"/><mml:mtext>Te</mml:mtext><mml:mspace width="-0.08em"/><mml:mtext>V</mml:mtext></mml:math>

Measurements of the production of the standard model Higgs boson decaying to a W boson pair are reported. The W$^+$W$^-$ candidates are selected in events with an oppositely charged lepton pair, large missing transverse momentum, and various numbers of jets. To select Higgs bosons produced via vector boson fusion and associated production with a W or Z boson, events with two jets and three or four leptons are also selected. The event sample corresponds to an integrated luminosity of 35.9 fb$^{-1}$, collected in pp collisions at $\sqrt{s} =$ 13 TeV by the CMS detector at the LHC during 2016. Combining all channels, the observed cross section times branching fraction is 1.28$^{+0.18}_{-0.17}$ times the standard model prediction for the Higgs boson with a mass of 125.09 GeV. The probability of observing a signal at least as large as the one seen, under the background-only hypothesis, corresponds to an observed significance of 9.1 standard deviations, to be compared with the expected value of 7.1 standard deviations.