BrowserVersionOwn?TypeAs String
Chrome81.0.4044???
Chrome86.0.4240ownfunctionfunction MessagePort() { [native code] }
Chrome88.0.4301???
Edge86.0.622ownfunctionfunction MessagePort() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction MessagePort() { [native code] }
Firefox68.0.0???
Firefox79.0.0ownfunctionfunction MessagePort() { [native code] }
HeadlessChrome81.0.4044ownfunctionfunction MessagePort() { [native code] }
IE10.0.0ownobject[object MessagePort]
Safari10.1.2ownfunctionfunction MessagePort() { [native code] }

PropertiesChromeEdgeFirefoxHeadlessChromeIESafari
length 86.0.4240 86.0.622 79.0.0 81.0.4044? 10.0.0
prototype 86.0.4240 86.0.622 79.0.0 81.0.4044 10.0.0 10.0.0