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Animate all versions of a class at same time, even when out of view?

Is there a way to change all instances of a class on a page at the same time, even when they are not in view? Examples is I have three H1s in their own sections. As I scrolling a section into view I want the H1 to change colour based on an animation associated with that section. But also that all H1 with the same class update their colour at the same time.

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