BrowserVersionOwn?TypeAs String
BingPreview1.0.0???
Chrome49.0.2623ownfunctionfunction ReadableByteStream() { [native code] }
Chrome69.0.3497???
Edge85.0.564???
Firefox68.0.0???
IE10.0.0???
Project1.3.2???
requests2.25.0???
Safari10.1.2???
SamsungBrowser13.0.0???
YandexBot3.0.0???

PropertiesBingPreviewChromeEdgeFirefoxIEProjectrequestsSafariSamsungBrowserYandexBot
length? 49.0.2623????????
prototype? 49.0.2623????????