It looks like the site is implementing a parallax effect (which is a scroll-linked effect) using JS. The experience should hopefully be improved by bug 1367770 (which is currently being worked on), but a complete solution would involve the site using scroll-linked animations instead (also being worked on).
Bug 1738838 Comment 1 Edit History
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It looks like the site is implementing a parallax effect (which is a scroll-linked effect) using JS. The experience should hopefully be improved by bug 1367770 (which is currently being worked on), but a complete solution would involve the site using [scroll-linked animations](https://drafts.csswg.org/scroll-animations-1/) instead (also being worked on).
It looks like the site is implementing a parallax effect (which is a scroll-linked effect) using JS. The experience should hopefully be improved by bug 1367770 (which is currently being worked on), but a complete solution would involve the site using [scroll-linked animations](https://drafts.csswg.org/scroll-animations-1/) instead (also being worked on but probably farther away from being released).