BrowserVersionOwn?TypeAs String
BingPreview1.0.0???
Chrome49.0.2623ownfunctionfunction DOMSettableTokenList() { [native code] }
Chrome68.0.3440???
Edge85.0.564???
Firefox56.0.0???
IE10.0.0ownobject[object DOMSettableTokenList]
Safari4.0.0???
SamsungBrowser13.0.0???
SFive80.0.0???
YandexBot3.0.0???

PropertiesBingPreviewChromeEdgeFirefoxIESafariSamsungBrowserSFiveYandexBot
length? 49.0.2623???????
prototype? 49.0.2623?? 10.0.0????