CLS
Cumulative Layout Shift
A Core Web Vital measuring unexpected layout movement during page load (target: under 0.1).
Chi tiết kỹ thuật
Search engines evaluate cls as part of their ranking algorithm, which considers hundreds of signals including content relevance, page experience (Core Web Vitals), backlink authority, and technical implementation. Google's crawlers (Googlebot) render JavaScript-heavy pages using a headless Chromium engine, but server-side rendered content is still discovered and indexed faster. Implementing cls correctly provides both direct ranking benefits and indirect improvements through better user experience.
Ví dụ
```html <!-- CLS: implementation example --> <meta name="robots" content="index, follow"> <link rel="canonical" href="https://peasytools.com/page/"> ```