value=5 min=0, max=10 step=1, ticks at 2, 4, 6, 8 and 10: 0 2 4 6 8 10
value=20 min=10, max=50 step=5, ticks at 0, 10, 20, 30, 40 and 50: 0 10 20 30 40 50
value=5 min=0, max=10 step="0.5", ticks at 0, 0.5, 1, 2, 4, 8: 0 0.5 1 2 4 8 10
value=5 min=0, max=10 step="any", ticks at 0, 5 and 10: 0 5 10