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How Percy captures a JavaScript-rendered page
Your test browser executes the Next.js app, including client-side rendering and hydration. When the test calls Percy’s snapshot function, Percy serializes the current DOM and discovers the resources needed to render it. Percy then renders the snapshot in its own environment for visual comparison. Its renderer has JavaScript disabled by default, so enabling JavaScript there is not required just because your app used JavaScript to produce the captured DOM. BrowserStack Docs explains this capture and rendering workflow at Percy SDK and screenshot capture workflow.
These are two distinct stages: app JavaScript must have produced the intended page state before capture, while JavaScript in Percy’s later re-render is a separate configuration choice. Turning on JavaScript during Percy rendering can introduce side effects such as redirects or animation, and may interfere with serialized state. The default and its implications are described in Percy configuration options.
Set up a Playwright snapshot for a Next.js route
Use the Playwright setup and test command already used by your project. Start the Next.js app in the test environment, navigate to the route, wait for a condition that proves the JavaScript-rendered state under test is present, and then call Percy with a stable, unique snapshot name. The package and command pattern below follow BrowserStack Docs’ Playwright integration guide; adapt the route, readiness condition, and test command to your project.
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1. Install the Percy Playwright SDK
Add the SDK to the project that runs your Playwright tests:
npm install --save-dev @percy/playwrightConfigure the Percy project token in the environment used for the test run. Do not commit the token to source control. Use the token provided for the Percy project you intend to update.
2. Wait for the actual page state, then capture it
For example, if the route renders a product panel after client-side data loads, wait for that panel rather than assuming navigation alone means the page is ready:
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import { test, expect } from '@playwright/test';
import percySnapshot from '@percy/playwright';
test('product page visual state', async ({ page }) => {
await page.goto('http://localhost:3000/products/example');
const productPanel = page.getByTestId('product-panel');
await expect(productPanel).toBeVisible();
await expect(productPanel).toContainText('Example product');
await percySnapshot(page, 'Product page — loaded state');
});Replace the example URL and selectors with the route and visible state your test is meant to protect. If content depends on an API response, a client-side transition, or a user action, make the test perform that work and wait for its expected result before capturing. Percy’s guide shows a navigation followed by a snapshot call; it is the application’s responsibility to identify the correct readiness condition.
3. Run the test command under Percy
Wrap the project’s existing browser test command with Percy:
npx percy exec -- npx playwright testIf your project uses a different Playwright command or script, put that command after --. Ensure the app is started and ready before the test command runs; the way to do that depends on your project and CI configuration. Percy’s integration documentation describes the project-token and percy exec workflow.
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4. Review the snapshot and baseline
Open the Percy build produced by the run, inspect the captured render and any diffs, and approve changes only when they reflect the intended UI. The integration guide says Percy compares against the previous build by default, and supports configuring a different base build. That matters when a branch or deployment should compare against a particular approved baseline rather than whichever build ran most recently.
Choose a capture workflow and coverage
Percy Web or Percy with Automate
Percy project setup offers Percy Web and Percy with Automate paths. Choose according to where you need the browser to run and how you want browser selection controlled; the Playwright integration documentation outlines these options. Keep the same core capture sequence either way: produce the desired state in the test browser, wait for it, and snapshot it.
One browser or cross-browser coverage
A single browser can be sufficient when the requirement is protecting a shared layout in one target environment. Add browser coverage when browser-specific behavior or layout differences are part of what you need to verify. Browser selection is a workflow choice, not a Next.js-specific Percy setting.
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Responsive widths
Select snapshot widths that represent layouts you actively need to protect, such as the breakpoints where navigation or content structure changes. Percy’s responsive visual testing documentation explains that each selected width counts as a separate screenshot toward monthly usage. Avoid adding widths that do not cover a meaningful layout requirement.
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Do not treat network idle as a universal ready signal
A Next.js page may continue making requests, poll, stream, or hydrate after initial navigation. Conversely, network activity ending does not prove that the particular text or UI state you care about has appeared. Prefer an explicit locator, expected text, state assertion, or completion condition tied to the intended snapshot. Use a delay or network-idle wait only when it matches the page’s behavior.
Authenticated pages and assets
Percy’s snapshot render happens outside the test suite’s browser session. If assets require authentication, the renderer may not automatically have the same access as the Playwright page. The Percy SDK documentation describes discovery configuration options for request headers, authorization, and cookies; configure what the renderer needs for those resources rather than assuming the test browser’s session carries over.
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Dynamic content and animation
Unstable data, timestamps, rotating content, and animations can produce diffs unrelated to a meaningful UI change. Stabilize test data and animation behavior where possible, and use Percy’s supported configuration options for dynamic regions or rendering behavior when appropriate. These are visual-test stability concerns, not defects unique to Next.js.
When to enable JavaScript in Percy’s renderer
Only consider enabling JavaScript if the captured snapshot genuinely requires scripts to run during Percy’s separate rendering step. First confirm that the test browser captured the intended post-JavaScript DOM. The renderer’s JavaScript setting defaults off, and turning it on can cause redirects, animations, or conflicts with serialized page state. See Percy configuration options before changing it.
Common problems and fixes
- The snapshot is missing content rendered by JavaScript: the test may have captured before hydration or asynchronous data finished. Wait for a specific visible element or expected value that represents the state under test, then take the snapshot.
- The snapshot looks different from the Playwright page: remember that Percy re-renders a serialized snapshot separately and disables JavaScript there by default. Check whether required assets are accessible to Percy, and whether the page relies on scripts running again after capture.
- Images, fonts, or other assets fail to appear: if requests require authentication, configure the needed headers, authorization, or cookies for Percy’s asset discovery/rendering workflow as documented by the SDK.
- Diffs change from run to run: stabilize data and animations, and avoid capturing rotating or time-dependent content unless that variability is what the test should cover.
- Too many snapshots are being consumed: each selected responsive width counts as a separate screenshot. Keep only widths that correspond to layouts or breakpoints you need to protect.
- A build compares against the wrong visual state: review the selected baseline. The previous build is the documented default; configure a base build when your workflow requires a different approved comparison point.
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