BrowserVersionOwn?TypeAs String
Chrome85.0.4183???
Chrome86.0.4240ownfunctionfunction VideoPlaybackQuality() { [native code] }
CriOS85.0.4183???
Edge86.0.622ownfunctionfunction VideoPlaybackQuality() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction VideoPlaybackQuality() { [native code] }
Firefox68.0.0ownfunctionfunction VideoPlaybackQuality() { [native code] }
IE10.0.0???
IE11.0.0ownobject[object VideoPlaybackQuality]
Safari10.1.2???

PropertiesChromeCriOSEdgeFirefoxIESafari
length 86.0.4240? 86.0.622 68.0.0??
prototype 86.0.4240? 86.0.622 68.0.0 11.0.0?