Accoridng to the Wikipedia and the Wikimedia svg, the Hungarian flag has a 2:1 ratio and the 3 stripes have the following RGB color values: The Red is #CD2A3E, the white is, well, it is white #FFFFFF, and the green is #436F4D.

examples/js/svg_flag_of_hungary.js

function flag_of_hungary() {
    var draw = SVG('flag_of_hungary');
    var width = 120;
    var height = width/2;
    draw.size(width, height);

    var red   = draw.rect(width, height/3).fill({ color: '#CD2A3E' });
    var white = draw.rect(width, height/3).fill({ color: '#FFFFFF' }).dy(height/3);
    var green = draw.rect(width, height/3).fill({ color: '#436F4D' }).dy(2*height/3);
}
flag_of_hungary();