CLS (Cumulative Layout Shift)
C-L-S
In one sentence
The score for unintended layout shifts after initial render. Google's Good threshold is 0.1. Widgets that inject gallery content without reserving the right vertical space tank CLS catastrophically.
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Strategy
Core Web Vitals Impact of UGC Widgets: Performance Data + Pre-Launch Checklist
Poorly built UGC widgets drop PageSpeed by 15-25 points and add 1.8s to LCP, often a bigger SEO loss than the conversion lift they were bought to deliver.
Strategy
How to add social proof without slowing your store
Add UGC and reviews without the speed tax: lazy-load, right-size media, keep scripts non-blocking, reserve layout space. A slow widget erases its own lift.
Strategy
Accessibility in shoppable video
Accessible shoppable video reaches more shoppers, not just a compliance box. Captions, keyboard control, contrast and reduced motion make it better for everyone.
See it working on a live store.
Real storefronts using the thing this page defines.
