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

PropertiesChromeEdgeFirefoxIESafari
ALT_MASK?? 79.0.0??
AT_TARGET 85.0.4183 86.0.622 79.0.0? 13.0.0
BUBBLING_PHASE 85.0.4183 86.0.622 79.0.0? 13.0.0
CAPTURING_PHASE 85.0.4183 86.0.622 79.0.0? 13.0.0
CONTROL_MASK?? 79.0.0??
length 85.0.4183 86.0.622 79.0.0? 13.0.0
META_MASK?? 79.0.0??
NONE 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
SHIFT_MASK?? 79.0.0??