Ads, embeds, and iframes without dimensions.The most common causes of a poor CLS are: In this guide, we'll cover optimizing common causes of layout shifts. Unlike the other Core Web Vitals, which are time-based values measured in seconds or milliseconds, the CLS score is a unitless value based on a calculation of how much content is shifting and by how far. To provide a good user experience, sites should strive to have a CLS of 0.1 or less for at least 75% of page visits. They're often caused when visible elements are forced to move because another element was suddenly added to the page or resized. 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. It looks at how much visible content shifted in the viewport as well as the distance the elements impacted were shifted. "I was about to click that! Why did it move? □"Ĭumulative Layout Shift (CLS) is one of the three Core Web Vitals metrics, and it measures the instability of content by summing shift scores across layout shifts that don't occur within 500 milliseconds of user input. Reduce CLS by ensuring pages are eligible for the bfcache.Ads, embeds, and other late-loaded content.Understanding where your shifts are coming from.
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