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It's in the comments here (lines 168-193): https://github.com/impress/impress.js/blob/master/js/impress...

> Browser should support CSS 3D transtorms

> Browser should support `classList` and `dataset` APIs

> But some mobile devices need to be blacklisted, because their CSS 3D support or hardware is not good enough to run impress.js properly, sorry...

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...hm, I know that CSS 3D transitions in particluar run extremely well on an iPhone 6, heck even a 5 should manage them well. The hardware is def good enough and these transitions are also hardware accelerated on an iPhone.

Not sure on the classList and dataset APIs and if there weren't any other option to implement the required functionality.

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