Layout shift direction on Wix sites
Horizontal lateral shifts (71.0%) versus downward vertical shifts (46.9%): how shift direction across 1,024 sites predicts real-user Cumulative Layout Shift.
71.0% of Wix sites use lateral horizontal layout shift direction, and 96% of those sites have a good CLS, against 98% of all Wix sites.
CLS pass rate
Sites with lateral horizontal layout shift direction have a good CLS most often: 96%, against 98% of all Wix sites. Sites with downward vertical shift direction have it least often, at 96%.
Layout shift direction usage
Lateral horizontal is the most used: 71.0% of Wix sites.
Layout shift direction per framework
React sets the layout shift direction to lateral horizontal on 71% of its sites, and 98% of React sites have a good CLS, against 98% of all sites.
React 1,023 sitesHorizontal (lateral) shift 71%Downward (vertical) shift 47%98%Layout shift direction or the framework
Does the framework explain the layout shift direction difference?
On React, 96% of sites with lateral horizontal layout shift direction have a good CLS, against 96% of React sites with downward vertical. Within React, sites with lateral horizontal and downward vertical have a good CLS about equally often.
Why downward vertical shifts carry a larger distance fraction
Cumulative Layout Shift multiplies impact fraction by distance fraction. Horizontal shifts (71.0% of shifting sites, 96% good field CLS) typically nudge navigation items by a few pixels during font swap, whereas downward shifts (46.9% of shifting sites, 96% good field CLS) push the entire main column down when top banners or unsized heroes expand.
Understanding layout shift direction
Audit downward vertical shifts (46.9% of shifting sites, 96% good CLS) by checking for late-injected announcement bars, cookie banners inserted into document flow, and unsized hero containers. Render overlays with position: fixed rather than pushing document content down, and reserve fixed heights for top-of-page slots.
By Arjen Karel · 5,621 crawled Wix sites (5,333 with all devices Chrome field data, 1,024 sites with layout shift direction, October 2026). How we measured.