SpeechSynthesisUtterance.onboundary

Undocumented in source. Be warned that the author may not have intended to support it.
  1. void onboundary(Optional!(T0) onboundary)
  2. EventHandler onboundary()
    struct SpeechSynthesisUtterance
    nothrow
    onboundary
    ()
    ()

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