It looks at how much visible content shifted in the viewport as well as the distance the elements impacted were shifted. They're often caused when visible elements are forced to move because another element was suddenly added to the page or resized.Ĭumulative Layout Shift (CLS) - a Core Web Vitals metric, measures the instability of content by summing shift scores across layout shifts that don't occur within 500ms of user input. Such experiences are visually jarring and frustrating. This is very common on the web, including when reading the news, or trying to click those 'Search' or 'Add to Cart' buttons. Imagine you've started reading an article when all of a sudden elements shift around the page, throwing you off and requiring you to find your place again. Layout shifts can be distracting to users.
"I was about to click that! Why did it move? 😭"
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