1. @DomName('WebGL2RenderingContext.blendFunc')
  2. @DocsEditable()
  3. @Experimental()
void blendFunc(int sfactor, int dfactor)

Source 

@DomName('WebGL2RenderingContext.blendFunc')
@DocsEditable()
@Experimental() // untriaged
void blendFunc(int sfactor, int dfactor) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .blendFunc_Callback_2_(this, sfactor, dfactor);