BrowserVersionOwn?TypeAs String
BingPreview1.0.0???
Chrome49.0.2623???
Edge85.0.564???
Firefox68.0.0???
IE10.0.0???
Safari10.1.2???
Safari13.0.4ownfunctionfunction ScreenLuminance() { [native code] }
Safari14.0.0???
SamsungBrowser13.0.0???
YandexBot3.0.0???

PropertiesBingPreviewChromeEdgeFirefoxIESafariSamsungBrowserYandexBot
length????? 13.0.4??
prototype????? 13.0.4??