Sometimes a web development client doesn't know quite what they want. Trying to guess is difficult and delivering a guess is risky. Where they have a vague idea, I offer to set them up with the means to create what they want for themselves-when they work out precisely what that is.
Given CSS-based scroll-driven animations are still behind various flags, I set my client up with a small IntersectionObserver script. This tiny module, called CreateObserver, is imported into the foot of the page and initialized with a few arguments.
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