CLS (Cumulative Layout Shift)

GarbuzSEO Specialist Published October 1, 2026

Definition

CLS (Cumulative Layout Shift) — CLS measures visual stability: how much page elements shift unexpectedly.

Target: ≤ 0.1. Set width/height on images and iframes, reserve space for banners, use font-display with adjusted fallback fonts.

Core Web Vitals are three Google metrics for real user experience: LCP (loading), INP (responsiveness) and CLS (visual stability).

LCP measures the time until the largest text block or image in the viewport is rendered.

INP measures the latency of interactions (clicks, taps, key presses) throughout the visit and reports one of the slowest.

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