Measures visual stability to ensure a smooth user experience.
CLS is a Core Web Vital metric that measures the visual stability of a page. It quantifies how much content unexpectedly 'jumps' or shifts around as the page loads.
Unexpected layout shifts are extremely frustrating for users. They can cause users to click on the wrong thing or lose their place while reading.
CLS is a direct ranking factor. A high CLS score indicates a poor user experience and will negatively affect your SEO.
Run a free audit to see how your site performs on Cumulative Layout Shift (CLS) and 159 other checks.
Start Free AuditChecks if images use responsive techniques like srcset.
Checks if images have width and height attributes to prevent layout shift.
Checks for JavaScript errors in the browser console. (Note: In-dev check)
Measures the total size of the HTML document.