If scripting is supported: there should be only a single static jumble below with the word "Control" blinking steadily. If there are two squares, or if the square is animated, then the test has failed.

If scripting is unsupported: there should be two identical patterned squares below.

Examine

  1       
          
222222222 
      3   
     444  
  55555555
  66666   
          
777777777 

            Control