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To quickly include the fonts in your web page you may wish to use our stylesheet which defines all the font-faces and links to the relevant files hosted on github.
Sparks uses OpenType's contextual alternates feature to perform simple replacement operations on numbers. It works on both the desktop and the web where it works without Javascript, though it does require a modern-ish web browser that can make use of OpenType features in text. At the moment it is compatible with Microsoft Word (2010 and later), Apple Pages, Adobe Creative Cloud applications, Chrome 33+, Safari 6+, Firefox 4+, and Internet Explorer 10+. (See: http://stateofwebtype.com/ for a fuller listing of browser compatibility.)
There are currently three variations: bars, dots, and dot-lines (line charts with tiny dots at the joints between segments), each of which has five weight variants.
All three of the variants use a fixed scale of 0–100. If your data only goes to e.g., 10, you'll need to first translate your numbers to be out of 100, otherwise you'll end up rendering an especially tiny chart.
