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Lynn wrote an excellent blog post on how she created this effect. I need to pick through it in more detail to unlock all of the tricks she used! The code is available on GitHub.
And it was simple from a development standpoint, too — as Richárd explains. “We use a super tiny JS framework called Stimulus. It lets us create small JavaScript components that are controlled by HTML data attributes,” he continues. With just a few extra HTML data parameters, the team could control horizontal and vertical velocity based on the speed of scrolling. “So larger objects and elements can move slower and the smaller ones can move faster in the virtual space,” Richárd concludes.
There is a time when you will need to reach for JavaScript. If you want an animated scroll experience, this is where JavaScript will be called for. GreenSock is the best JavaScript library for web animation.