BrowserVersionOwn?TypeAs String
Chrome81.0.4044???
Chrome85.0.4183ownfunctionfunction MediaKeySystemAccess() { [native code] }
Chrome88.0.4301???
Edge86.0.622ownfunctionfunction MediaKeySystemAccess() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction MediaKeySystemAccess() { [native code] }
Firefox68.0.0???
Firefox79.0.0ownfunctionfunction MediaKeySystemAccess() { [native code] }
HeadlessChrome81.0.4044???
IE10.0.0???
Safari10.1.2???
Safari13.0.4ownfunctionfunction MediaKeySystemAccess() { [native code] }

PropertiesChromeEdgeFirefoxHeadlessChromeIESafari
length 85.0.4183 86.0.622 79.0.0?? 13.0.0
prototype 85.0.4183 86.0.622 79.0.0?? 13.0.0