I built a simple charts library for Radio-Canada called Moby, which we used in an article about Montréal's mayor, Denis Coderre, who is using Twitter quite a lot. As usual, the library is open source and available on Github. One interesting aspect of Moby is that it uses plain HTML, no SVG or Canvas, even line charts and this bubble chart.
Try it, this example is interactive! Or tweak it on Blockbuilder.