Scroll-Linked Animations

You scroll down to a certain point, now you want to style things in a certain way. A header becomes fixed. An animation triggers. A table of contents appears. To do anything based on scroll position, JavaScript is required right now. You watch the scroll position via a DOM event and alter an element’s styling based on that position. Or, probably better if you can, use IntersectionObserver. We just blogged about all this.
Now there is a new (unofficial) … Read article
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Link: https://wicg.github.io/scroll-animations/