Debug Cumulative Layout Shift (CLS)

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Frequently Asked Questions

This tool obtains the page's CLS score and the elements causing the layout shift from Google's CLS algorithm. It highlights these elements on the UI to help debug and fix the layout shifts.
This tool loads the provided URL and scrolls through the page to enable Google's CLS detection to identify the layout shifts. However, layout shifts triggered from other interactions (for example: swiping a carousel or clicking a button) aren't detected by this tool.
Every non-zero layout shift reported by Google's CLS detection algorithm is listed in the results screen. You can select any of these to focus on individual layout shifts.

 
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