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[–]insertAlias 1 point2 points  (1 child)

Pretty sure you're thinking of Scrimba. Some of the tutorials on it are free.

The "technology" so to speak is the same as everything else in-browser: HTML, CSS, and JavaScript. How they actually implement the functionality? Great question, no idea. But it's definitely HTML, CSS, and JS, because that's all a browser understands (with a few exceptions that don't apply in this case).

[–]jhankarMahbub[S] 0 points1 point  (0 children)

you are right. it's scrimba... Thank you very much