Core Web Vitals
Core Web Vitals describe loading experience, responsiveness and visual stability. The measurement environment and underlying data should be reported with the result.
Core Web Vitals are metrics for the experience of using a web page. They include Largest Contentful Paint (LCP) for loading the largest visible content element, Interaction to Next Paint (INP) for responsiveness to interactions, and Cumulative Layout Shift (CLS) for unexpected layout shifts.
Read measurements in context
A fictional service page loads quickly and stays visually stable while being read. These metrics still do not answer whether the enquiry form successfully delivers a message. They describe particular aspects of page use, rather than the entire business process.
Distinguish field and lab data
The Web Vitals documentation distinguishes field and lab measurements. Field data comes from actual use; lab tests examine defined conditions. A page-load-only test without interactions cannot measure INP. When evaluating a report, record its data source, time period and measurement environment. A single test run cannot simply be presented as the experience of every visitor.
Sources
Related terms
- CrawlingCrawling is the automated fetching of web pages and resources by a bot, for example for processing by a search engine.
- IndexingDuring indexing, a search engine analyses content and adds information about it to its search index.
- Structured dataStructured data describes content in a machine-readable format and explicitly identifies its meaning.
- XML sitemapAn XML sitemap gives search engines selected URLs from a website and may include additional information about them.
- Robots.txtrobots.txt gives rules to cooperating crawlers; it provides neither access protection nor reliable exclusion from the search index.
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