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'Designing Safer Web Animation For Motion Sensitivity' →

In addition to performing poorly on many devices, fancy animations on the web have accessibility implications as well. Val Head provides some good guidelines.

Different people have different conditions and reactions, of course. But these examples show that the triggers are more nuanced than one might think if one simply assumes that any or all animation will be problematic. Three factors, in particular, play a big role: the relative size of the movement, the direction of movement, and the perceived distance an animated object covers.