TrackDefaultList trackDefaults

Source 

@DomName('SourceBuffer.trackDefaults')
@DocsEditable()
@Experimental() // untriaged
TrackDefaultList get trackDefaults =>
    _blink.BlinkSourceBuffer.instance.trackDefaults_Getter_(this);
void trackDefaults=(TrackDefaultList value)

Source 

@DomName('SourceBuffer.trackDefaults')
@DocsEditable()
@Experimental() // untriaged
set trackDefaults(TrackDefaultList value) =>
    _blink.BlinkSourceBuffer.instance.trackDefaults_Setter_(this, value);