Jeremy Keith calls out for “a lightweight SVG solution for sparklines”, which seems like it would be a nice thing to have.
Like this, kinda:
Just grab http://www.kryogenix.org/random/sparkline.svg and then use it in your pages* like this:
<embed src="http://www.kryogenix.org/random/sparkline.svg?1,8,1,8,1,8" width=100 height=15>
<img>, because embedded script doesn’t run in SVGs used as images.