BrowserVersionOwn?TypeAs String
Chrome85.0.4183???
Chrome86.0.4240ownfunctionfunction ReportingObserver() { [native code] }
Edge86.0.622ownfunctionfunction ReportingObserver() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction ReportingObserver() { [native code] }
Firefox68.0.0???
Firefox83.0.0ownfunctionfunction ReportingObserver() { [native code] }
IE10.0.0???
Safari10.1.2???

PropertiesChromeEdgeFirefoxIESafari
length 86.0.4240 86.0.622 83.0.0??
prototype 86.0.4240 86.0.622 83.0.0??