num viewportAnchorX

Source 

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

Source 

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