BrowserVersionOwn?TypeAs String
BW1.1.0???
Chrome85.0.4183???
Edge86.0.622???
Firefox68.0.0???
Firefox79.0.0ownfunctionfunction IDBFileHandle() { [native code] }
IE10.0.0???
Safari10.1.2???

PropertiesBWChromeEdgeFirefoxIESafari
length??? 79.0.0??
prototype??? 79.0.0??