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Use Playwright’s fullPage: true option to capture the whole scrollable page. A full-page image and a sticky header’s visible viewport state are not necessarily the same thing, so if the header must appear exactly as it looks at a particular scroll position, capture the header separately as well and inspect both outputs.
Capture the full page with Playwright
Playwright’s page screenshot API supports full-page capture. This minimal Node.js example opens a page and saves one tall image of its scrollable document:
const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const page = await browser.newPage({ viewport: { width: 1440, height: 900 } });
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.screenshot({ path: 'page.png', fullPage: true });
await browser.close();
})();Install Playwright in your project first, then run the script with Node.js. The viewport is explicit so the page layout is repeatable in the same browser environment. Replace the example URL with the page your agent needs to capture. See the Playwright Screenshots documentation for the full-page option and related examples.
fullPage: true requests the full scrollable page; it does not, by itself, guarantee that every site renders sticky elements the way they look in an ordinary viewport screenshot. A full-page capture may represent the document differently from a live viewport with the page scrolled to a particular point. Check the actual image when the header’s exact visual state matters.
Preserve the header’s visible state explicitly
If you need proof of how the sticky header looked while visible, save an additional screenshot of the header element. This captures the element’s bounds, rather than relying on full-page rendering to preserve a particular sticky state.
await page.locator('header').screenshot({ path: 'header.png' });Use a selector that matches the site’s actual header; some pages use a class or another element instead of a semantic <header>. The locator must resolve to the intended element and be visible. The element screenshot is a crop, not a replacement for the full-page document image. See the Playwright ElementHandle API for element screenshot behavior and visibility considerations.
Make the capture workflow reliable
- Set the intended viewport. Use the same desktop or mobile dimensions for the capture and any later comparison. A responsive page can change its header and layout across viewport sizes.
- Navigate and wait for the page. Wait until the page is in the desired state before capturing.
networkidlecan be useful for pages that settle after requests finish, but a page with continuing network activity may need a different, page-specific wait condition. - Trigger scroll-loaded content. If sections or images load only when scrolled into view, scroll through the page and wait for those sections to render before asking for the full-page screenshot. Full-page capture requests the document extent; it does not establish that arbitrary lazy-loaded content has already appeared.
- Capture the document and, if needed, the header. Save the full-page image with
fullPage: true. If a specific header state is required, capture the header element separately after the page reaches that state. - Inspect the images. Look for a missing or repeated header, unloaded sections, overlays, and content cut off at the edges. Do not treat the screenshot as verified until the saved output has actually been checked.
Choose the screenshot scope that matches the goal
| Capture | What it shows | Use it when |
|---|---|---|
| Viewport | The currently visible area, including a sticky header if it is visible at that moment. | You need the page’s current on-screen state. |
| Full page | The full scrollable document in one tall image, requested with fullPage: true. |
You need a single image covering the document. |
| Header element | A cropped image bounded by the selected header element. | You need to preserve the header as a distinct image in a chosen page state. |
Using Playwright MCP with an AI agent
Playwright MCP’s screenshot tool supports viewport, element, and full-page captures. When using its options, note that fullPage cannot be combined with an element target. Take separate captures if you need both the full document and the header crop. Its scale option selects CSS-pixel or device-pixel output: CSS scale tracks CSS layout dimensions, while device scale produces higher-resolution output. See the Playwright MCP Screenshots documentation for the tool options.
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Make screenshot comparisons repeatable
For visual tests, keep the browser, viewport, and execution environment consistent between a baseline and a new capture. Playwright Test’s toHaveScreenshot() waits for two consecutive screenshots to match before comparing against the stored expectation. Screenshot options can also handle animations, masks, clip regions, and injected styles. These controls reduce some variation; they do not guarantee pixel-identical results across different operating systems, browser versions, hardware, settings, power sources, or headless modes. See Playwright visual comparisons and the PageAssertions API.
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ScreenshotNeo is a screenshot API and MCP server for developers. Its API returns an image or PDF from a GET request; the example below saves a WebP screenshot. See the ScreenshotNeo API documentation for parameters and response details.
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curl -G "https://api.screenshotneo.com/v1/shot"
-d access_key=YOUR_API_KEY
--data-urlencode url=https://example.com
-o shot.webpScreenshotNeo accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each of those steps can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers indicate the page verdict and billing status. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots.
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Frequently Asked Questions
Does a full-page screenshot always show a sticky header only once?
No universal outcome is promised for every site. Inspect the saved image, and capture the header separately if its exact visible state matters.
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