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Besides that 99 % 6 = 3, so if the browser fired the setInterval function precisely every 99 ms, only two emojis would be displayed.

Thanks for noticing, I will update the article

99 % 6 === 3 ((99 % 6) + 99) % 6 === 0 ((((99 % 6) + 99) % 6) + 99) % 6 === 3