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cumulative-layout-shift

Use when auditing slow page loads, heavy assets, or rendering delays related to Minimize cumulative layout shift. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.

skills/cumulative-layout-shift/SKILL.md

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# Minimize cumulative layout shift

Layout shifts cause accidental clicks, reading disruption, and user frustration—a good CLS score ensures content stays where users expect it.

## Quick Reference

- CLS measures visual stability—target score below 0.1
- Always set width/height on images and embeds
- Reserve space for ads, banners, and dynamic content
- Use transform animations instead of layout-changing properties

## Check

Measure CLS using Lighthouse or PageSpeed Insights. Verify score is below 0.1 for good visual stability.