BrowserVersionOwn?TypeAs String
BW1.1.0???
Chrome85.0.4183???
Chrome86.0.4240ownfunctionfunction PresentationConnection() { [native code] }
Edge86.0.622ownfunctionfunction PresentationConnection() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction PresentationConnection() { [native code] }
Firefox68.0.0???
IE10.0.0???
Safari10.1.2???

PropertiesBWChromeEdgeFirefoxIESafari
length? 86.0.4240 86.0.622???
prototype? 86.0.4240 86.0.622???