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Use the mask option and give Playwright one or more locators for the regions that should be hidden in a visual screenshot. Playwright paints each matched element’s bounding box with a pink overlay by default; set maskColor to change it. The option works with page and locator screenshots as well as toHaveScreenshot() assertions.
What Playwright masking does
A screenshot mask is a visual overlay applied while Playwright captures the image. The page is not changed, and the dynamic value is not made deterministic. Instead, the matched element’s bounding box is covered in the image that is compared with, or saved as, the screenshot.
The default overlay color is #FF00FF (pink). You can provide another CSS color through maskColor. Because the overlay covers the complete bounding box, a selector that is wider than the volatile content can hide nearby pixels as well.
Masking is intended for rendered-image assertions. Use toHaveScreenshot() for Playwright Test visual comparisons, rather than a generic snapshot assertion.
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Basic syntax with a visual assertion
Install and configure the Playwright Test runner, then pass a locator array in the assertion options:
import { test, expect } from '@playwright/test';
test('account page hides the changing balance', async ({ page }) => {
await page.goto('https://example.com/account');
await expect(page).toHaveScreenshot('account.png', {
mask: [page.getByTestId('dynamic-account-value')],
});
});The named screenshot form stores or compares account.png. You can also omit the name when using the page-wide assertion:
await expect(page).toHaveScreenshot({
mask: [page.getByTestId('dynamic-account-value')],
});Playwright’s screenshot assertion waits for two consecutive screenshots to be identical before it compares them. Masking therefore removes a known volatile region, while the stabilization wait handles changes that are still settling elsewhere on the page.
Masking a component instead of the whole page
Use a locator assertion when the test is concerned with one component:
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await expect(card).toHaveScreenshot('profile-card.png', {
mask: [card.getByTestId('last-seen')],
});The screenshot is scoped to profile-card, and the mask is evaluated inside that capture. This keeps unrelated page changes out of a component-level visual test.
For a standalone capture rather than an assertion, the page and locator screenshot APIs accept the same option:
await page.screenshot({
path: 'dashboard.png',
fullPage: true,
mask: [page.getByTestId('live-stock-price')],
maskColor: '#444444',
});
await page.getByTestId('invoice').screenshot({
path: 'invoice.png',
mask: [page.getByTestId('generated-invoice-number')],
});Use locator-based APIs instead of ElementHandle.screenshot(); locator methods are the preferred way to identify and capture elements.
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Choosing a locator that masks only what you intend
Locators determine both what is covered and how robust the test is. Prefer a stable, narrowly scoped locator for the changing region.
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mask: [page.getByTestId('random-avatar')]A test ID is useful when the product team can mark a region specifically for automation.
Roles, labels, text and other built-in locators
Use role locators for interactive controls and text locators for visible text content when those descriptions are stable:
mask: [page.getByRole('status', { name: 'Current time' })]Labels, placeholders, alternative text and titles are also available when they uniquely identify the target. Avoid selectors based on generated class names or DOM positions; they tend to break when styling or layout changes.
CSS selectors for a precise region
mask: [page.locator('[data-volatile="price"] .amount')]Keep the selector as close as possible to the changing pixels. If the volatile number is inside a large panel, masking the entire panel will hide stable content that the screenshot should continue to protect.
Hidden matches are masked too
Playwright applies a mask to matching elements even when a match is invisible. A broad selector can therefore mask a hidden template, duplicate menu, or off-canvas element that you did not expect to affect the screenshot.
If only visible elements should be covered, constrain the locator with a visibility filter:
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const visibleNotice = page
.locator('[data-testid="notice"]')
.filter({ visible: true });
await expect(page).toHaveScreenshot({
mask: [visibleNotice],
});Inspect the DOM and locator matches when a mask appears to have no effect or covers an unexpected area. A visibility constraint expresses the intent explicitly instead of relying on the element’s current state.
Page-wide versus element-level screenshots
| Capture scope | Use it when | Main masking consideration |
|---|---|---|
expect(page).toHaveScreenshot() |
You are guarding the complete rendered page or a full-page visual regression. | A broad mask can hide unrelated content; use a tight locator and enable full-page capture only when the test needs it. |
expect(locator).toHaveScreenshot() |
You are protecting one component, card or region. | Keep the mask inside the component and ensure it identifies the intended descendant. |
page.screenshot() or locator.screenshot() |
You need a saved image without a visual assertion. | The same bounding-box overlay rules apply, including the treatment of invisible matches. |
Choose the smallest capture scope that matches the test’s purpose. A page assertion checks integration and layout across the page; a locator assertion gives a more focused component contract.
Multiple masks and a custom color
Pass every changing region in one array. All matching boxes receive the same overlay color for that capture:
await expect(page).toHaveScreenshot('checkout.png', {
mask: [
page.getByTestId('session-id'),
page.getByTestId('recommendation-carousel'),
page.getByRole('status', { name: 'Payment processing time' }),
],
maskColor: '#222222',
});Use a color that is easy to recognize in review. Changing the color changes the expected image, so keep it consistent across a project unless a particular test needs a different convention.
What masking does not solve
- Layout instability: If a changing value changes its width, the surrounding layout can still move. Mask the smallest stable container that includes the layout effect, or make the test data deterministic.
- Animations and transitions: A mask does not stop animation elsewhere on the page. Disable or wait for animations as part of page setup.
- Network and loading races: Wait for the page state your test requires before taking the screenshot. The assertion’s consecutive-capture stabilization is not a replacement for reliable setup.
- Incorrect selector scope: A mask hides a locator’s bounding box, not an arbitrary substring inside it. Refine the locator when the overlay is too large.
Do not confuse visual snapshots with other snapshot types
Visual screenshot assertions
toHaveScreenshot() compares rendered pixels and supports the mask and maskColor options described here. It is part of the Playwright Test runner.
Generic snapshots
toMatchSnapshot() accepts strings, buffers and other serialized data. It is not the visual screenshot workflow; use toHaveScreenshot() when the subject is a rendered image.
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ARIA snapshots
ARIA snapshots represent accessible structure rather than pixels and use toMatchAriaSnapshot(). Screenshot masks do not apply to that representation. If the requirement is to verify accessible names, roles or relationships, write an ARIA assertion separately.
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A complete test pattern
This example combines stable navigation, several locators, a visibility constraint and a component assertion:
import { test, expect } from '@playwright/test';
test('dashboard visual contract', async ({ page }) => {
await page.goto('https://example.com/dashboard');
await page.getByRole('heading', { name: 'Dashboard' }).waitFor();
const masks = [
page.getByTestId('rotating-message'),
page.getByTestId('current-user-time'),
page.locator('[data-testid="ad-slot"]').filter({ visible: true }),
];
await expect(page).toHaveScreenshot('dashboard.png', {
fullPage: true,
mask: masks,
maskColor: '#FF00FF',
});
const salesPanel = page.getByTestId('sales-panel');
await expect(salesPanel).toHaveScreenshot('sales-panel.png', {
mask: [salesPanel.getByTestId('live-total')],
});
});Use page-wide and component-level assertions independently when they protect different contracts. Do not mask a region in a page test merely because it is difficult to stabilize if that region is itself important to the product’s visual behavior.
Troubleshooting mask failures
The overlay is missing
- Confirm that the locator matches the element at capture time.
- Check that the locator is scoped to the correct frame or component.
- Wait for the page state that creates the element before the assertion.
- Verify that the test is using
toHaveScreenshot(),page.screenshot()orlocator.screenshot(), not a generic snapshot matcher.
The overlay covers too much
The mask covers the complete bounding box. Replace a panel-level selector with a locator for the exact value or wrap the value in a dedicated test ID. This also reduces accidental masking of stable pixels.
A hidden duplicate is masked
Playwright masks invisible matches as well. Narrow the selector or add a visibility filter so only the intended rendered instance is selected.
The screenshot still changes between runs
Look for unmasked clocks, rotating content, animations, random data, delayed fonts, lazy images and network-dependent widgets. Mask only regions that are irrelevant to the assertion; stabilize important content through deterministic test data and explicit waits.
The baseline differs after changing maskColor
The overlay is part of the captured image. Changing maskColor necessarily changes the expected screenshot, so regenerate the baseline deliberately and review the diff.
Reliability and performance practices
- Use semantic or test-ID locators that survive CSS refactors.
- Keep masks narrow so visual regressions around the dynamic value remain visible.
- Reuse a consistent mask color and naming convention across the test suite.
- Prefer component screenshots for fast, focused checks and page screenshots for integration coverage.
- Keep page setup deterministic; masking should remove irrelevant variability, not conceal failures.
- Review any new mask as a test-design change: document why the region is intentionally excluded.
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import requests
r = requests.get(
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params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
timeout=90,
)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)And in Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
const fs = await import('node:fs/promises');
await fs.writeFile('shot.webp', Buffer.from(await res.arrayBuffer()));ScreenshotNeo also supports full-page and selector captures, 12 device presets plus custom viewports, retina scale, dark mode, custom CSS and JavaScript, click and wait conditions, request blocking, headers, cookies, user agents, authorization, timezone, geolocation, transparent backgrounds, resizing, selectable cache TTLs, signed image links, asynchronous jobs with signed webhooks, bulk capture for up to 100 URLs per call, a usage API and an OpenAPI specification. Existing parameter names used by other screenshot APIs work as well.
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FAQ
Does a mask alter the page that later test steps interact with?
No. The overlay belongs to the captured image; the DOM and the live page remain available to subsequent actions.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchCan I apply different colors to different masked elements in one assertion?
No. A screenshot capture has one maskColor value. If regions need different visual treatment, capture them separately or use separate assertions.
Bottom line
Put stable, narrowly scoped locators in mask: [...] on the page, locator or toHaveScreenshot() call. Remember that Playwright masks complete bounding boxes—including invisible matches—so refine selectors and add visibility constraints when necessary. Use visual screenshot assertions for pixels, and keep ARIA or generic snapshots as separate workflows.
Frequently Asked Questions
Does a mask alter the page that later test steps interact with?
No. The overlay belongs to the captured image; the DOM and live page remain available to subsequent actions.
Can I apply different colors to different masked elements in one assertion?
No. A screenshot capture has one maskColor value. Capture regions separately if they need different colors.
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