BrowserVersionOwn?TypeAs String
Chrome85.0.4183???
Chrome86.0.4240ownfunctionfunction PresentationAvailability() { [native code] }
CriOS85.0.4183???
Edge86.0.622ownfunctionfunction PresentationAvailability() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction PresentationAvailability() { [native code] }
Firefox68.0.0???
IE10.0.0???
KomodiaBot1.0.0???
Safari10.1.2???

PropertiesChromeCriOSEdgeFirefoxIEKomodiaBotSafari
length 86.0.4240? 86.0.622????
prototype 86.0.4240? 86.0.622????