num viewportAnchorY

Source 

@DomName('VTTRegion.viewportAnchorY')
@DocsEditable()
@Experimental() // untriaged
num get viewportAnchorY =>
    _blink.BlinkVTTRegion.instance.viewportAnchorY_Getter_(this);
void viewportAnchorY=(num value)

Source 

@DomName('VTTRegion.viewportAnchorY')
@DocsEditable()
@Experimental() // untriaged
set viewportAnchorY(num value) =>
    _blink.BlinkVTTRegion.instance.viewportAnchorY_Setter_(this, value);