BrowserVersionOwn?TypeAs String
Chrome38.0.2125???
Chrome86.0.4240ownfunctionfunction VTTRegion() { [native code] }
Chrome87.0.0???
Chrome87.0.4280ownfunctionfunction VTTRegion() { [native code] }
Chrome88.0.4313???
Chrome88.0.4324ownfunctionfunction VTTRegion() { [native code] }
Chrome89.0.4354???
Chrome89.0.4386ownfunctionfunction VTTRegion() { [native code] }
Chrome89.0.4389???
Chrome91.0.4472ownfunctionfunction VTTRegion() { [native code] }
Chrome92.0.4491???
Edge17.17134.0???
Firefox51.0.0???
Firefox70.0.0ownfunctionfunction VTTRegion() { [native code] }
FxiOS35.0.0???
Goanna4.8.0???
IE10.0.0???
Safari4.0.0???
Safari10.1.2ownfunctionfunction VTTRegion() { [native code] }
Safari12.1.1???
Safari12.1.2ownfunctionfunction VTTRegion() { [native code] }
Safari14.1.1???
SamsungBrowser14.0.0???
Stargon3.9.1???

PropertiesChromeEdgeFirefoxFxiOSGoannaIESafariSamsungBrowserStargon
length 86.0.4240? 70.0.0??? 10.0.0??
prototype 86.0.4240? 70.0.0??? 10.0.0??