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The Zwicky Transient Facility (ZTF) reported the event "ZTF19abanrhr" as acandidate electromagnetic (EM) counterpart at a redshift $z=0.438$ to thegravitational wave (GW) emission from the binary black hole merger GW190521.Assuming that ZTF19abanrhr is the {\it bona fide} EM counterpart to GW190521,and using the GW luminosity distance estimate from three different waveformsNRSur7dq4, SEOBNRv4PHM, and IMRPhenomPv3HM, we report a measurement of theHubble constant $H_0= 50.4_{-19.5}^{+28.1}$ km/s/Mpc, $ 62.2_{-19.7}^{+29.5}$km/s/Mpc, and $ 43.1_{-11.4}^{+24.6}$ km/s/Mpc (median along with $68\%$credible interval) respectively after marginalizing over matter density$\Omega_m$ (or dark energy equation of state $w_0$) assuming the flat LCDM (orwCDM) model. Combining our results with the binary neutron star event GW170817with its redshift measurement alone, as well as with its inclination angleinferred from Very Large Baseline Interferometry (VLBI), we find $H_0=67.6_{-4.2}^{+4.3}$ km/s/Mpc, $\Omega_m= 0.47_{-0.27}^{+0.34}$, and $w_0=-1.17_{-0.57}^{+0.68}$ (median along with $68\%$ credible interval) providingthe most stringent measurement on $H_0$ and the first estimation on $\Omega_m$and $w_0$ from bright standard siren. In the future, $1.3\%$ measurement of$H_0=68$ km/s/Mpc and $28\%$ measurement of $w_0=-1$ is possible from about$200$ GW190521-like sources.

First measurement of the Hubble parameter from bright binary black hole GW190521