On a web page, how do you print dots over and under numbers for octave changes as well as the slash and backslash to indicate a sharp or flat? The trick is to use an online image processor as in this example.

For this harmonic minor scale, the code to insert is

  <img src=http://normanschmidt.net/nmn.php?nmn=6_7_*1_2_3_4_x5_6>

LaTeX can also be used

  <img src=http://wordpress.com/latex.php?latex=6~~7~~\dot1~~2~~3~
              ~4~~\slash\hspace{-2mm}5~~6>

to write the same scale.  

The Rousseau Music Book uses LaTeX.