BrowserVersionOwn?TypeAs String
BingPreview1.0.0???
Chrome49.0.2623???
Chrome78.0.3904ownfunctionfunction WeakRef() { [native code] }
Chrome79.0.3945???
Chrome84.0.4147ownfunctionfunction WeakRef() { [native code] }
Chrome88.0.4324???
Chrome89.0.4386ownfunctionfunction WeakRef() { [native code] }
Chrome89.0.4387???
Edge85.0.564???
Edge86.0.622ownfunctionfunction WeakRef() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction WeakRef() { [native code] }
Edge87.0.664???
Edge88.0.670ownfunctionfunction WeakRef() { [native code] }
Edge89.0.723???
Firefox68.0.0???
Firefox79.0.0ownfunctionfunction WeakRef() { [native code] }
IE10.0.0???
Project1.3.2???
Qwantify1.0.0???
requests2.25.0???
Safari10.1.2???
SamsungBrowser13.0.0???
YandexBot3.0.0???

PropertiesBingPreviewChromeEdgeFirefoxIEProjectQwantifyrequestsSafariSamsungBrowserYandexBot
length? 78.0.3904 86.0.622 79.0.0???????
prototype? 78.0.3904 86.0.622 79.0.0???????