This is part of the SVG Tutorial and exercises drawing square in SVG.
Actually a square is just a rectangular where all the 4 sides are the same length, but the color is much nicer here.
function draw_square() {
var draw = SVG('square_1');
draw.size(120, 120);
var square = draw.rect(100, 100);
square.attr({ fill: '#f06' });
}
draw_square()