BrowserVersionOwn?TypeAs String
BingPreview1.0.0???
Chrome49.0.2623???
Chrome86.0.4240ownfunctionfunction FileSystemWritableFileStream() { [native code] }
Chrome89.0.4354???
Chrome89.0.4386ownfunctionfunction FileSystemWritableFileStream() { [native code] }
Chrome89.0.4387???
Edge85.0.564???
Edge86.0.622ownfunctionfunction FileSystemWritableFileStream() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction FileSystemWritableFileStream() { [native code] }
Edge87.0.664???
Edge88.0.670ownfunctionfunction FileSystemWritableFileStream() { [native code] }
Edge89.0.723???
Firefox68.0.0???
IE10.0.0???
Safari10.1.2???
SamsungBrowser13.0.0???
YandexBot3.0.0???

PropertiesBingPreviewChromeEdgeFirefoxIESafariSamsungBrowserYandexBot
length? 86.0.4240 86.0.622?????
prototype? 86.0.4240 86.0.622?????