BrowserVersionOwn?TypeAs String
Chrome85.0.4183???
Chrome86.0.4240ownfunctionfunction SpeechSynthesisErrorEvent() { [native code] }
Chrome88.0.4301???
Edge86.0.622ownfunctionfunction SpeechSynthesisErrorEvent() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction SpeechSynthesisErrorEvent() { [native code] }
Firefox68.0.0ownfunctionfunction SpeechSynthesisErrorEvent() { [native code] }
IE10.0.0???
Safari10.1.2???

PropertiesChromeEdgeFirefoxIESafari
ALT_MASK?? 68.0.0??
AT_TARGET 86.0.4240 86.0.622 68.0.0??
BUBBLING_PHASE 86.0.4240 86.0.622 68.0.0??
CAPTURING_PHASE 86.0.4240 86.0.622 68.0.0??
CONTROL_MASK?? 68.0.0??
length 86.0.4240 86.0.622 68.0.0??
META_MASK?? 68.0.0??
NONE 86.0.4240 86.0.622 68.0.0??
prototype 86.0.4240 86.0.622 68.0.0??
SHIFT_MASK?? 68.0.0??