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Technical SEOUpdated Nov 6, 2026

What is Cumulative Layout Shift (CLS)?

Definition

CLS measures the visual stability of a web page by tracking unexpected layout shifts during the entire page lifecycle. A score under 0.1 is considered good.

Also known as:CLSvisual stabilityCore Web Vitals metric

Why layout shifts hurt user trust

When images load without specified aspect ratios or dynamic fonts swap unexpectedly, buttons and text jump around the screen. This causes accidental clicks, frustrated visitors, and reduced Google page experience rankings.

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