CrUX CLS

The CrUX CLS (Cumulative Layout Shift) metric measures unexpected layout shifts affecting a page's visual stability. It is fetched via the CrUX API for a specific origin, with the formFactor based on the user agent used in the crawl. For example, if a mobile user agent is used, the CLS data will reflect the "phone" formFactor, showing how the page performs on mobile devices, helping optimize visual stability.

Code: cruxCls