Suggest an editImprove this articleRefine the answer for “What is CLS (Cumulative Layout Shift)?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**CLS (Cumulative Layout Shift)** is a Core Web Vitals metric that measures how much and how unexpectedly elements on a page shift during its loading. **Key point:** Google's threshold for good is up to 0.1, and the fewer visual jumps, the better the user experience and the SEO signals.Shown above the full answer for quick recall.Answer (EN)Image**CLS (Cumulative Layout Shift)** is a Core Web Vitals metric that measures **how much and how unexpectedly elements on a page shift during its loading**. It shows *the visual stability of the interface*. If images, text, buttons, or banners suddenly "jump" during loading, that's bad CLS. A user can: - miss a button, - lose their place in a text they were reading, - accidentally click the wrong thing. --- ### **What CLS reflects** CLS isn't about speed. It's a metric about **display quality and usability**. It captures *unexpected shifts* of elements that happen without any user action. --- ### **Google's thresholds** - Good: **≤ 0.1** - Needs improvement: 0.11-0.25 - Poor: **> 0.25** --- ### **Typical causes of bad CLS** - images without specified width/height, - ad banners that load later and push content down, - dynamic elements (banners, pop-ups) without pre-reserved space, - fonts that change text size after loading. --- ### **Why it matters** CLS affects the sense of control and comfort. Even a fast page feels "broken" and annoying if the interface jumps around. Which means a higher bounce rate, and lower engagement and conversion. **Conclusion:** CLS is about a stable, predictable interface. The fewer visual jumps, the better the user experience and the SEO signals.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.