<canvas width="600" height="400"> </canvas>
<script>
function dibujarCuadrado(x,y,color){
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = color;
pincel.fillRect(x,y,50,50);
pincel.strokeStyle = "black";
pincel.strokeRect(x,y,50,50);
}
for(var x = 0; x < 600; x = x + 50){
dibujarCuadrado(x,0,"blue");
dibujarCuadrado(x,50,"white");
dibujarCuadrado(x,100,"blue");}
</script>
