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Usually people use something similar to Scrollama.js.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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The Pudding specializes in these scrollytelling data viz stories. And they have how to blogs and also open source all of their work on github they have both a vanilla js and a svelte starter template that would be helpful. Plus you can see how they do their work.
NOTE:
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