1. @DomName('WebGLRenderingContext.stencilOp')
  2. @DocsEditable()
void stencilOp(int fail, int zfail, int zpass)

Source 

@DomName('WebGLRenderingContext.stencilOp')
@DocsEditable()
void stencilOp(int fail, int zfail, int zpass) =>
    _blink.BlinkWebGLRenderingContext.instance
        .stencilOp_Callback_3_(this, fail, zfail, zpass);