1. @DomName('WebGL2RenderingContext.polygonOffset')
  2. @DocsEditable()
  3. @Experimental()
void polygonOffset(num factor, num units)

Source 

@DomName('WebGL2RenderingContext.polygonOffset')
@DocsEditable()
@Experimental() // untriaged
void polygonOffset(num factor, num units) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .polygonOffset_Callback_2_(this, factor, units);