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Use TestCafe’s t.resizeWindow(width, height) action to request explicit browser-window dimensions, even when Chrome runs headlessly. Start the test with TestCafe’s chrome:headless browser alias, then resize from inside the test. For other goals, TestCafe also provides t.maximizeWindow() and t.resizeWindowToFitDevice(deviceName).
Set a specific size in a headless TestCafe test
Put await t.resizeWindow(width, height) in the test before the actions or assertions that depend on the page layout. The dimensions are the requested browser-window size; they are not a guarantee that every operating system, CI host, or remote provider will produce identical rendered dimensions.
import { Selector } from 'testcafe';
fixture`Responsive layout`
.page`https://example.test`;
test('renders at a fixed browser size', async t => {
await t.resizeWindow(1280, 800);
// Add assertions for the layout expected at this size.
});Run the test with headless Chrome:
testcafe "chrome:headless" tests/responsive.test.jsThe browser alias selects headless Chrome; the resize action belongs in the test. Check the TestCafe version installed in your project if the method or alias behaves differently, since the project’s installed version is the one that controls what is available at runtime.
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Choose the right TestCafe sizing action
| Goal | TestCafe action | What to keep in mind |
|---|---|---|
| Request a known width and height | t.resizeWindow(width, height) |
Use this when the test needs an explicit browser-window size. |
| Fill the available screen | t.maximizeWindow() |
Maximizing is not the same as entering browser full-screen mode. |
| Size for a supported device | t.resizeWindowToFitDevice(deviceName) |
Pass a device name from TestCafe’s compatible-device list. |
These are distinct actions rather than interchangeable names for the same behavior. Fixed dimensions are appropriate for repeatable responsive-layout checks; maximizing is useful when a small starting window hides controls; device sizing is for a supported device profile. A requested window size should not be treated as proof of a particular CSS viewport size in every execution environment.
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Keep window dimensions predictable across tests
TestCafe documents that browser-window dimensions persist across tests and fixtures. If a test changes the size, later tests may inherit it. Reset the size in a hook when each test needs the same starting condition rather than relying on the browser to return to a default automatically.
fixture`Responsive layout`
.page`https://example.test`
.beforeEach(async t => {
await t.resizeWindow(1280, 800);
});
test('wide layout', async t => {
// Assertions for the 1280 by 800 test window.
});
test('narrow layout', async t => {
await t.resizeWindow(390, 844);
// Assertions for the narrow layout.
});In this pattern, the fixture hook establishes a known starting size, while the second test deliberately changes it for a narrow-layout case. If the suite has tests that alter the window, make the intended size explicit in the relevant test or hook so that test order does not determine the starting conditions.
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Headless Chrome and the --window-size flag
Prefer TestCafe’s resize action over relying on Chromium’s --window-size command-line flag. TestCafe documents a native-automation issue in which Chromium-based browsers may not honor that flag. Its v3.6.0 release notes, dated April 25, 2024, separately say that headless Chromium does not always honor --window-size. That is a version-specific documented caveat, not a claim that every current Chrome setup ignores the flag.
The practical distinction is that the TestCafe action expresses the size change through the test API after the browser has launched. The command-line flag is an input to browser startup and, in the documented cases, may not produce the requested size. For tests that depend on layout, make the size-setting action part of the test and verify behavior in the same local or CI environment where the suite runs.
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Environment limits to check
- Remote browsers: TestCafe documents that these window-sizing actions cannot resize remote browser windows. If the browser is provided remotely, confirm what sizing controls that provider exposes instead of assuming a local window action will work.
- macOS: TestCafe describes window resizing as compatible out of the box.
- Windows: TestCafe lists .NET 4.0 or newer as a requirement.
- Linux: The window manager must comply with ICCCM/EWMH.
These are documented environment conditions, not an exhaustive compatibility matrix for every browser build, CI image, or provider. When a resize request appears to have no effect, check whether the test uses a local browser and whether the operating system’s windowing environment meets the stated requirements.
Troubleshoot sizing and layout failures
The requested size has no effect
- Confirm that the test calls
await t.resizeWindow(width, height)and that the action runs before the layout assertion. - Check whether the test is using a remote browser; TestCafe says remote browser windows cannot be resized with these actions.
- On Linux, check for an ICCCM/EWMH-compliant window manager. On Windows, check the .NET requirement.
- If the setup relies only on
--window-size, replace that dependency with TestCafe’s resize action where possible.
An element cannot be located or appears to be missing
A page may hide controls at smaller window dimensions. If a selector cannot locate an element, first check whether the application’s responsive layout hides or relocates it at the current size. Set the intended dimensions explicitly with t.resizeWindow, or use t.maximizeWindow() when the test is meant to run with the available screen filled. The appropriate fix is to match the test size to the layout state being tested, not simply to assume the element is absent from the page.
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A later test starts at an unexpected size
Window dimensions persist across tests and fixtures. Add a reset in a test or hook that runs before the test’s layout-sensitive steps. Avoid making a test depend on whichever size a previous test happened to leave behind.
Maximizing does not enter full-screen mode
t.maximizeWindow() fills the available screen but does not trigger the browser’s full-screen mode. TestCafe documents the --start-fullscreen flag for full-screen mode in compatible browsers. Use the distinction deliberately: maximize for an available-screen window, and full-screen mode only when that browser behavior is what the test needs.
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Capture a screenshot without setting up a browser
If your goal is a website screenshot rather than testing an application at a particular Chrome window size, ScreenshotNeo can return a screenshot or PDF from one API request. It does not replace TestCafe’s window-resizing action or run your TestCafe assertions.
For example, save a screenshot of a URL with cURL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request details. Before the shot, it accepts the cookie or consent banner like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each of those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and responses include X-Page-Verdict and X-Billed headers. An MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents and MCP clients. The Free plan includes 1,000 screenshots a month without a card; paid plans start at $5 for 3,000 shots.
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FAQ
Does headless mode prevent TestCafe from taking screenshots?
No. TestCafe’s browser guide states that screenshots and browser-window resizing are still supported in headless mode.
Does TestCafe resize the page’s CSS viewport or the browser window?
The documented methods are browser-window sizing actions. Treat the requested dimensions as the sizing input, not as a universal guarantee of identical viewport dimensions across environments.
Can I use any device name with resizeWindowToFitDevice?
No. Use a device name from TestCafe’s compatible-device list; the method is for supported device profiles.
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