If a Playwright screenshot is coming out light, emulate the prefers-color-scheme: dark media preference before taking the screenshot:
await page.emulateMedia({ colorScheme: 'dark' });
await page.screenshot({ path: 'screenshot.png' });This sets the browser preference; the page must respond to that preference for its styling to look dark. See the Playwright Page API.
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Set dark mode for a one-off screenshot
Call page.emulateMedia() on the page you plan to capture, then take the screenshot. Set the preference after creating the page but before the screenshot:
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const browser = await chromium.launch();
const page = await browser.newPage();
await page.goto('https://example.com');
await page.emulateMedia({ colorScheme: 'dark' });
await page.screenshot({ path: 'screenshot.png' });
await browser.close();The relevant setting is colorScheme: 'dark'. Playwright documents this as emulating the prefers-color-scheme media feature, not as an instruction for page.screenshot() to choose or impose a theme. The page API also allows setting the media preference on an existing page. See the Page API reference.
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Make dark mode the default for tests
For tests that should consistently use dark mode, set the preference at the test or project scope instead of repeating the page-level call in every test.
Set it for a test
import { test, expect } from '@playwright/test';
test.use({ colorScheme: 'dark' });
test('renders in dark mode', async ({ page }) => {
await page.goto('https://example.com');
await page.screenshot({ path: 'screenshot.png' });
});Playwright Test’s test.use() applies the option to tests in its scope. Refer to the Emulation guide for the documented test configuration.
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Set it for a project
To use dark mode as the default across a Playwright Test project, set use.colorScheme in playwright.config.ts:
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import { defineConfig } from '@playwright/test';
export default defineConfig({
use: {
colorScheme: 'dark',
},
});This is useful when the whole project needs the same preference. Use a narrower test-level setting when only some tests should emulate dark mode. The Test use options reference lists the available configuration options.
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Check whether the page received the dark preference
When a screenshot still looks light, check the browser’s media-query result on the captured page:
const isDark = await page.evaluate(
() => matchMedia('(prefers-color-scheme: dark)').matches
);
console.log(isDark);After emulating dark mode, this should log true. This verifies the preference the page sees; it does not prove that the application’s theme styles are using it.
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Why a screenshot can remain light
colorScheme: 'dark' emulates a browser media preference. The website must implement styling or behavior that responds to prefers-color-scheme for the page to appear dark. If the query check returns true but the image is still light, inspect the site’s theme mechanism: it may use an application setting, saved preference, or in-page toggle rather than following the media preference automatically. Set that application state as well when the site requires it.
Use dark mode while generating a test
Playwright’s code generator accepts a dark color-scheme option. Pass it when launching codegen with the target URL:
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npx playwright codegen --color-scheme=dark https://example.comSee the official Codegen documentation.
Troubleshooting a light screenshot
- The preference was set after the capture: call
page.emulateMedia({ colorScheme: 'dark' })beforepage.screenshot(). - You configured a different page or context: apply the option to the same page being captured, or configure the test/project that creates it.
- The media query is not active: evaluate
matchMedia('(prefers-color-scheme: dark)').matches. If it returnsfalse, check that the emulation call or test configuration is applied where the page is created. - The query is true but the page is light: the app may not use
prefers-color-scheme, or its theme may be controlled by saved application state or a toggle. Configure the app’s own theme state as needed.
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