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oh that's a bummer, didn't know that killed the examples and links to the font files :(
I just created a new issue and uploaded a zip file of their fonts to their Github: https://github.com/aftertheflood/sparks/files/12009401/AtF.S...
(Finally a justification for my font hoarding)
Cool explanation! I use quite a lot of SVG visualisations generated server-side. Some basic charts (including sparkline) are bundled up into ContEx (an elixir library) - see https://contex-charts.org/ (disclosure - author).
SVGs are amazing for interactive visualisation too. Like Flamegraphs: https://www.brendangregg.com/flamegraphs.html
I ended up hand crafting my svg graphs for non.io for many of the same reasons. I originally was looking around at 3rd party libraries, but one of my goals with the site was to use as few external libraries as possible. I made an attempt at dynamically generating the svg points myself, and found it incredibly easy.
For context, here's the 22 lines of code it took to create a simple svg graph: https://github.com/jjcm/soci-frontend/blob/master/components...
And here's the final output: https://non.io/Animation-example