PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 27.0.1453? 12.0.0 50.0.0 2.1.0?? 3.0.0 6.0.0
prototype 27.0.1453? 12.0.0 50.0.0 2.1.0?? 3.0.0 6.0.0