This is a sample of how to make a dynamic background of stars for a Web
page using Dojo GFX.  It's smart enough to make use of the current em size
for sizing the stars themselves, and it's also smart enought o make use of
the overall screen size, so expanding a window reveals more stars, not
empty space.  The compressed code takes up far less space than a bitmap
image big enough to do the same would, and as it's using vector graphics
it's crisp at any resolution / screen size / etc.