PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 41.0.2272? 18.0.0 60.0.0 2.1.0?? 3.0.0?
prototype 41.0.2272? 18.0.0 60.0.0 2.1.0?? 3.0.0?