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SpeechSynthesisEvent: SpeechSynthesisEvent() constructor - Web APIs | MDN
new SpeechSynthesisEvent(type, options)
type
A string with the name of the event.
It is case-sensitive and browsers set it to start, end, error, pause, resume, mark, or boundary.
options
An object that, in addition to the properties defined in Event() , has the following properties:
utterance
A SpeechSynthesisUtterance
charIndex Optional
The index position of the character in SpeechSynthesisUtterance.text0.
charLength Optional
The number of characters left to be spoken after the character at the charIndex0.
elapsedTime Optional
The elapsed time in seconds, after the SpeechSynthesisUtterance.text0.
name Optional
The name associated with certain types of events: the name of the SSML marker reached in the case of a markboundary"").
