function numberMatrix() {
var items = [
  [1, 3, 3, 3, 3],
  [2, 1, 3, 3, 3],
  [2, 2, 1, 3, 3],
  [2, 2, 2, 1, 3],
  [2, 2, 2, 2, 1]

];
var y = 0;
var par = document.getElementById('it');
while ( y < 5 ) {
  for  (var i = 0; i < 5; i++) {
    par.innerHTML += items[y][i] + " ";
  }
    par.innerHTML += '<br>';
  y++;
}
}

numberMatrix();