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BrowserStack Percy Full-Page Screenshots Cut Off Sticky Headers: What to Check

Percy may show a sticky header only once at the top of a full-page screenshot. Here’s how to tell expected behavior from real clipping and troubleshoot missing content.
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If a Percy full-page screenshot shows a sticky header once at the top and not again farther down, that is documented behavior—not necessarily clipping. Percy says it displays fixed or sticky elements only once per screenshot. If the header is visibly cropped where it appears, or page content is missing, investigate overflow and capture setup separately.

First, check whether Percy is behaving as designed

BrowserStack’s Percy documentation says: “Percy stabilizes sticky elements by displaying them only once per screenshot.” Fixed or sticky headers and footers generally appear at the top rather than repeating at each scroll position. A header absent from later sections of the image is therefore not, by itself, evidence that Percy cut it off. BrowserStack: Handle sticky elements.

Look closely at the header’s first appearance. If it is shown intact and only once, the result is consistent with Percy’s documented treatment. If it is cropped, missing where it should appear, or accompanied by missing page content, continue with the checks below.

Identify the capture workflow and its bounds

Percy Web or Percy with Automate

Full-page screenshots are the default for Percy Web projects. For Percy with Automate, BrowserStack documents enabling full-page capture with the fullPage option. The exact setting does not apply to App Percy, which is a separate mobile-app workflow.

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Check the documented length limits

BrowserStack’s Percy with Automate documentation lists a desktop maximum of 10,000 pixels or 10 tiles, whichever is smaller, and a mobile maximum of 10 tiles. These are documented service limits; confirm the current limits in the docs when configuring a capture. A page near or beyond the limit may not be represented in full. BrowserStack: Full-page screenshot.

Fix actual clipping from overflow

When content is cut off, inspect the page’s ancestor elements for CSS that clips overflow. BrowserStack recommends finding the element responsible and resetting that specific CSS with Percy CSS. Its example is:

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.container is only an example: inspect the affected page and target the actual clipping element. Avoid changing overflow globally if a narrower override fixes the capture. BrowserStack: Screenshots do not capture the full page.

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Stabilize the page before capturing

  • Wait for page readiness. In Percy with Automate, capture after the page has loaded.
  • Trigger lazy-loaded content. If content appears only as the visitor scrolls, scroll to the bottom before capture so it can load.
  • Control moving content. Pause animations, video, or carousels that change the page while Percy captures it.
  • Handle popups and consent state. Close or otherwise handle popups that obstruct the page. If the test requires a particular cookie-banner state, accept or reject the banner before capture as appropriate.
  • Check scroll position. BrowserStack’s troubleshooting guidance recommends scrolling the driver to the correct page location when full-page content is incorrect.

For a reproducible visual test, set the same readiness, scroll, animation, and banner state each run. BrowserStack’s docs cover dynamic data handling and full-page captures.

Check internal scroll containers and problematic elements

A page may scroll inside a panel rather than through the document. If Percy’s full-page result omits content inside such an internal scroll area, BrowserStack advises making that container fully scrollable for Percy using Percy CSS. If one particular element makes the image incorrect, its troubleshooting guidance also suggests hiding that element with Percy CSS—only do so when removing it matches the intended test. See Troubleshoot common issues.

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Use this diagnostic sequence

  1. Confirm whether the project is Percy Web or Percy with Automate; for Automate, verify that full-page capture is enabled with fullPage.
  2. Compare the image with the expected sticky behavior: a header displayed once at the top and not repeated is consistent with Percy’s documentation.
  3. If the header itself is cropped or content is absent, inspect ancestor overflow styles and apply a Percy CSS override to the element actually responsible.
  4. Make the capture deterministic: wait for page load, scroll far enough to trigger lazy content, stabilize animations and popups, and set the intended cookie-banner state.
  5. For nested scrolling, make the internal container fully scrollable in Percy. Check viewport and browser differences, and compare screenshot length with the documented limits.

Or skip the browser setup

ScreenshotNeo takes a website screenshot with one GET request. For example, this cURL call saves a WebP screenshot of Stripe:

curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp

See the ScreenshotNeo API documentation for request options. ScreenshotNeo accepts cookie or consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers report the page verdict and billing status. Its MCP server provides screenshot tools for Claude, Cursor, and other MCP clients. 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 Percy repeat a sticky header throughout a full-page screenshot?

No. Percy documents showing fixed or sticky elements only once per screenshot, generally at the top.

Does the sticky-header behavior prove the header was clipped?

No. A header shown intact once is consistent with the documented behavior. Cropping at its displayed location or missing page content calls for separate overflow and capture checks.

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