BrowserVersionOwn?TypeAs String
Chrome86.0.4240ownfunctionfunction VTTRegion() { [native code] }
Edge86.0.622???
Firefox68.0.0???
Firefox79.0.0ownfunctionfunction VTTRegion() { [native code] }
IE10.0.0???
Safari10.1.2ownfunctionfunction VTTRegion() { [native code] }

PropertiesChromeEdgeFirefoxIESafari
length 86.0.4240? 79.0.0? 10.0.0
prototype 86.0.4240? 79.0.0? 10.0.0