1. @DomName('WebGLRenderingContext.blendFunc')
  2. @DocsEditable()
void blendFunc(int sfactor, int dfactor)

Source 

@DomName('WebGLRenderingContext.blendFunc')
@DocsEditable()
void blendFunc(int sfactor, int dfactor) =>
    _blink.BlinkWebGLRenderingContext.instance
        .blendFunc_Callback_2_(this, sfactor, dfactor);