This is part of the SVG Tutorial and exercises drawing a line in SVG.
function draw_x() {
var draw = SVG('draw_x');
draw.size(200, 200);
draw.line(0, 0, 200,200).attr({
'stroke' : '#FF0000',
'stroke-width' : '5px'
});
draw.line(0, 200, 200,0).attr({
'stroke' : '#FF0000',
'stroke-width' : '5px'
});
}
draw_x();