![]() Placeholder images or other images with a low entropy, that likely do not reflect the true content of the pageīrowsers are likely to continue to improve these heuristics to ensure we match user expectations of what the largest contentful element is.Elements that cover the full viewport, that are likely considered as background rather than content.Elements with an opacity of 0, that are invisible to the user.For Chromium-based browsers, these include: The first frame of an animated image format, such as animated GIFs (as of August 2023)Īs well as only considering some elements, certain heurisitics are applied to exclude certain elements that are likely to be seen as "non-contentful" to users.The first frame painted for autoplaying elements (as of August 2023). ![]() Block-level elements containing text nodes or other inline-level text elements children.An element with a background image loaded via the url() function (as opposed to a CSS gradient).elements with a poster image (the poster image load time is used).To learn more about the research and methodology behind this recommendation, see: Defining the Core Web Vitals metrics thresholds What elements are considered? #Īs currently specified in the Largest Contentful Paint API, the types of elements considered for Largest Contentful Paint are: To ensure you're hitting this target for most of your users, a good threshold to measure is the 75th percentile of page loads, segmented across mobile and desktop devices. To provide a good user experience, sites should strive to have Largest Contentful Paint of 2.5 seconds or less. The Largest Contentful Paint (LCP) metric reports the render time of the largest image or text block visible within the viewport, relative to when the page first started loading. ![]() Based on discussions in the W3C Web Performance Working Group and research done at Google, we've found that a more accurate way to measure when the main content of a page is loaded is to look at when the largest element was rendered. In the past we've recommended performance metrics like First Meaningful Paint (FMP) and Speed Index (SI) (both available in Lighthouse) to help capture more of the loading experience after the initial paint, but these metrics are complex, hard to explain, and often wrong-meaning they still do not identify when the main content of the page has loaded. If a page shows a splash screen or displays a loading indicator, this moment is not very relevant to the user. And newer, user-centric performance metrics like First Contentful Paint (FCP) only capture the very beginning of the loading experience. Older metrics like load or DOMContentLoaded are not good because they don't necessarily correspond to what the user sees on their screen. Historically, it's been a challenge for web developers to measure how quickly the main content of a web page loads and is visible to users. Largest Contentful Paint (LCP) is an important, stable Core Web Vital metric for measuring perceived load speed because it marks the point in the page load timeline when the page's main content has likely loaded-a fast LCP helps reassure the user that the page is useful.
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