1. DomName('WebGL2RenderingContext.stencilFunc')
  2. DocsEditable()
  3. Experimental()
void stencilFunc(int func, int ref, int mask)

Source 

@DomName('WebGL2RenderingContext.stencilFunc')
@DocsEditable()
@Experimental() // untriaged
void stencilFunc(int func, int ref, int mask) => _blink.BlinkWebGL2RenderingContext.instance.stencilFunc_Callback_3_(this, func, ref, mask);