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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Google has promoted this metric as one of the three "Core Web Vitals" that affect user experience on the web. It is also slated to become a search ranking signal over the next few weeks, which has created a lot of awareness about it. The suggested target for a good Largest Contentful Paint is less than 2.5 seconds for at least 75% of page loads.
The HTTP Archive runs Lighthouse audits for approximately 7.2 million websites every month. In the May 2021 dataset, Lighthouse was able to identify an LCP element in 97.35% of the tests. Since we have the ability to query all of these Lighthouse test results, we can analyze the result of the LCP audits and get more insight into what drives this metric across the web.