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Web Development
Cumulative Layout Shift measures how much content jumps around unexpectedly while a page loads. Good is a score of 0.1 or less.
Layout shifts happen when something loads late and pushes other content down: an image without set dimensions, a late banner, or a web font that changes text size.
Reserving space for images, ads, and embeds before they load is the main fix.
Example
A visitor goes to tap "Buy", a promotional banner loads above it, and they tap the wrong link. Giving the banner fixed space removes the shift.
Why it matters
Shifting pages are frustrating and cause mis-clicks, which hurts trust and conversions as well as the Core Web Vitals score.
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Web Development
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