1. @DomName('WebGL2RenderingContext.stencilOp')
  2. @DocsEditable()
  3. @Experimental()
void stencilOp(int fail, int zfail, int zpass)

Source 

@DomName('WebGL2RenderingContext.stencilOp')
@DocsEditable()
@Experimental() // untriaged
void stencilOp(int fail, int zfail, int zpass) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .stencilOp_Callback_3_(this, fail, zfail, zpass);