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<canvas width="600" height="400"> </canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "darkgreen";
pincel.fillRect(150,50,350,300);
pincel.fillStyle = "black";//ojo izq
pincel.fillRect(200,110,90,90);
pincel.fillStyle = "black";//ojo der
pincel.fillRect(360,110,90,90);
pincel.fillStyle = "black";//nariz
pincel.fillRect(290,200,70,100);
pincel.fillStyle = "black";//boca izq
pincel.fillRect(250,240,40,110);
pincel.fillStyle = "black";//boca izq
pincel.fillRect(360,240,40,110);
</script>