1. @DomName('WebGL2RenderingContext.stencilMask')
  2. @DocsEditable()
  3. @Experimental()
void stencilMask(int mask)

Source 

@DomName('WebGL2RenderingContext.stencilMask')
@DocsEditable()
@Experimental() // untriaged
void stencilMask(int mask) => _blink.BlinkWebGL2RenderingContext.instance
    .stencilMask_Callback_1_(this, mask);