Tired of partial webpage screenshots? Discover how to capture entire, full-size web pages from header to footer using Rust and the powerful Chrome DevTools Protocol (CDP). This in-depth guide, leveraging the `thirtyfour` crate, reveals the secret to bypassing standard WebDriver viewport limitations with `Page.captureScreenshot`'s `captureBeyondViewport` parameter, making it perfect for visual regression testing, generating complete website previews, or archiving web content without missing a single pixel.