1. @DomName('WebGL2RenderingContext.blendColor')
  2. @DocsEditable()
  3. @Experimental()
void blendColor(num red, num green, num blue, num alpha)

Source 

@DomName('WebGL2RenderingContext.blendColor')
@DocsEditable()
@Experimental() // untriaged
void blendColor(num red, num green, num blue, num alpha) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .blendColor_Callback_4_(this, red, green, blue, alpha);