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

PropertiesChromeEdgeFirefoxHeadlessChromeIESafari
CLOSED 86.0.4240 86.0.622 79.0.0 81.0.4044? 10.0.0
CONNECTING 86.0.4240 86.0.622 79.0.0 81.0.4044? 10.0.0
length 86.0.4240 86.0.622 79.0.0 81.0.4044? 10.0.0
OPEN 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