tone property
String toneSource
@DomName('RTCDTMFToneChangeEvent.tone') @DocsEditable() String get tone => _blink.BlinkRTCDTMFToneChangeEvent.instance.tone_Getter_(this);
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https://api.dartlang.org/stable/1.24.3/dart-html/RtcDtmfToneChangeEvent/tone.html