BrowserVersionOwn?TypeAs String
Chrome81.0.4044???
Chrome86.0.4240ownfunctionfunction GamepadButtonEvent() { [native code] }
Chrome88.0.4301???
Edge86.0.622???
Firefox68.0.0???
Firefox83.0.0ownfunctionfunction GamepadButtonEvent() { [native code] }
HeadlessChrome81.0.4044???
IE10.0.0???
Safari10.1.2???

PropertiesChromeEdgeFirefoxHeadlessChromeIESafari
ALT_MASK?? 83.0.0???
AT_TARGET 86.0.4240? 83.0.0???
BUBBLING_PHASE 86.0.4240? 83.0.0???
CAPTURING_PHASE 86.0.4240? 83.0.0???
CONTROL_MASK?? 83.0.0???
length 86.0.4240? 83.0.0???
META_MASK?? 83.0.0???
NONE 86.0.4240? 83.0.0???
prototype 86.0.4240? 83.0.0???
SHIFT_MASK?? 83.0.0???