The problem here is that by adding that class within the layout div, we made the browser recalculate styles one more time
Smooth as Butter: Achieving 60 FPS Animations with CSS3
José Rosário
5K57

Nice article, while I have a question at here, what does this “recalculate styles one more time” mean? Didn’t the browser only recalculate the app-menu style but also recalculate some other element style? Looking forward for your explanation.

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