Prerender is a technique in which a full page — including HTML, CSS, JavaScript execution, and network requests — is processed in a hidden background context so that the navigation appears instantaneous when the user actually clicks through. In its modern form, prerendering is triggered via the Speculation Rules API in Chrome (available from version 108, shipped January 2023), which superseded the older and poorly supported <link rel="prerender"> hint. When a page is prerendered, the browser executes it in a background tab that is held in a suspended state; on navigation, the tab is instantly swapped in. Analytics and ad code typically detect activation via the Page Visibility API and fire their events only when the prerendered page becomes visible. Prerendering is most effective for high-confidence next navigations, such as the first result in a search or the next step in a funnel. Because the entire page load happens before the user navigates, prerendered pages can achieve Core Web Vitals metrics that appear near-zero in field data.