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SEO

What is CLS (Cumulative Layout Shift)?

The total score for unexpected layout shifts while the page loads. Good: <0.1.

Detailed definition

If the layout shifts just as a user is about to press a button and they hit the wrong one, the CLS score goes up. The main causes: images without a width and height, ads or banners that load late and push content down, and text shifting while web fonts load. Fixes: size attributes on img and iframe elements, reserved space for ad slots and font loading settings such as font-display: optional.

Examples

  • If a product list is lazy loaded without image dimensions being specified, CLS deteriorates.

Related terms

Core Web Vitals The three main metrics Google uses to measure site performance: LCP, INP and CLS. LCP (Largest Contentful Paint) How long the page's main content block (usually the hero image or heading) takes to load. Good: <2.5s, poor: >4s. Schema.org / Structured Data A shared vocabulary for marking up information on web pages (products, prices, organisations, articles) in fields machines can read; used for Google rich result eligibility, with no ranking guarantee. On-Page SEO The SEO optimisation carried out on the page itself: title, meta description, heading hierarchy and content quality. Backlink A link given to your site from another site. One of the most important off-page signals in SEO.
Category SEO

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From the same category

Other terms in the SEO category

Canonical URL The <link rel="canonical"> tag that tells Google the "main" URL of a page. hreflang The link attribute that states which language sits at which URL on multilingual or multi-region sites. Meta Description The short description that can appear under the title in Google search results. It is not a ranking factor but influences whether people click. SERP (Search Engine Results Page) The search engine results page — the mix of organic results, ads and rich snippets the user sees after searching. SEO (Search Engine Optimization) The discipline of increasing a website's organic (unpaid) visibility on Google and other search engines. E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) The framework Google uses in quality assessment: experience, expertise, authoritativeness and trust. It is not a direct ranking factor.
See the full glossary →

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