BrowserVersionOwn?TypeAs String
Chrome81.0.4044???
Edge86.0.622???
Firefox68.0.0???
HeadlessChrome81.0.4044???
IE10.0.0ownobject[object ClientRect]
Safari10.1.2ownfunctionfunction ClientRect() { [native code] }
Safari11.0.0???

PropertiesChromeEdgeFirefoxHeadlessChromeIESafari
length????? 10.1.2
prototype???? 10.0.0 10.1.2