Question: True or false? Cumulative Layout Shift is only measured on a page's first load.
- True
- False
Explanation
Cumulative Layout Shift (CLS) measures all unexpected layout shifts that occur throughout the entire lifespan of a page, not just the first load. It captures shifts caused by images, ads, or dynamic content appearing after initial rendering. Monitoring CLS ensures visual stability and enhances user experience, which is a key Page Experience signal. Reducing CLS improves usability and SEO performance.
Why the other options are incorrect
A) CLS is calculated over the full page session, so it is not limited to the first load.
Source for verification
HubSpot Academy: Core Web Vitals and Page Experience
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