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But this isn't documentation.

This is a tutorial, in which progression and transitioning between steps is a fundamental part of the content. Representing that transition via animations is not inappropriate.

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It looks cool, but it is inappropriate because it wastes time since the transitions take time.

Do they take more time than repeating the same 10 or 20 lines of code with slight changes every couple of paragraphs, and having the reader try to figure out what changed since the last 4 times they read almost the same code?

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