1. DomName('VTTRegionList.getRegionById')
  2. DocsEditable()
  3. Experimental()
VttRegion getRegionById(String id)

Source 

@DomName('VTTRegionList.getRegionById')
@DocsEditable()
@Experimental() // untriaged
VttRegion getRegionById(String id) => _blink.BlinkVTTRegionList.instance.getRegionById_Callback_1_(this, id);