PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 41.0.2272? 12.0.0 56.0.0??? 3.0.0 6.2.0
prototype 41.0.2272? 12.0.0 56.0.0??? 3.0.0 6.2.0