2 For Loops in 1

gistfile1.js

// 2 loops in 1 : https://jsfiddle.net/rntasz32/2/
var width=3;
var height=3;
var size = width*height;

var x = 0;
var y = 0;
for (var i = 0; i < size; i++)
{
    x = (i / 3) | 0;
    y = i % 3;
    document.getElementById('output').innerHTML += "x:"+x+" y:"+y+"\n";
}