JavaScript - pregunta de javascript sobre paleta de colores

<script language="JavaScript">

	var alto = 0;

	var ancho = 0;

	var color = 0;

	alto = screen.width;

	ancho = screen.height;

	color = screen.colorDepth+"px";

	document.write("Alto: "+alto+"<br>");

	document.write("Ancho; "+ancho+"<br>");

	document.write("Colores: "+color);

</script>