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2. Yes, see for example https://chartscss.org/examples/column/ and the feature list https://chartscss.org/charts/

2. You could use the title attribute to accomplish this. The example for mouseover contains a span tag that probably mess it up for a screen reader read so it reads it out twice. Might happen if using the title attribute as well.

Yeah, it can be a flip depending on implementation, whether you can beat something that is just pixels and GPU with the DOM + browser rendering engine, which has more layers and unpredictability.