What Cumulative Layout Shift (CLS) measures
Measures visual stability by quantifying unexpected layout shifts on the page during loading.
Glossary: Cumulative Layout Shift (CLS)
Cumulative Layout Shift (CLS)
Measures visual stability by quantifying unexpected layout shifts on the page during loading.
How to measure Cumulative Layout Shift (CLS)
Sum the impact fractions of layout shifts in the viewport after page load; target a score below 0.1.
Why it matters
Poor CLS undermines trust and makes product pages feel unreliable, increasing abandonment.
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