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);