A DOM emulator reproduces your HTML. It does not reproduce a browser. Meanwhile browser tests usually run against a separate server, blind to application state. PlaywrightPHP and the Playwright Symfony bundle close that gap: a real browser drives the page while the test kernel handles the request in the same PHP process, no web server involved. One PHPUnit test can drag a card in a Live Component, wait for the async update, then assert the DOM, the dispatched events, and the database rows. Three live demos cover payment flows, Live Components, and visual regression on a design system.