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Viewport is the emulated page area that controls CSS layout, responsive breakpoints, and values such as window.innerWidth. Screen is the display geometry exposed to page JavaScript through window.screen. They describe different layers of the browser, so changing one does not generally change the other.
For most responsive tests, set a fixed viewport. Set screen as well only when the application reads screen metrics or the scenario models a display larger than the browser content area.
Viewport and screen: the practical difference
| Concern | viewport |
screen |
|---|---|---|
| Main purpose | Emulates the page content dimensions used for layout and rendering. | Emulates display geometry exposed through window.screen. |
| Typical page observations | window.innerWidth, window.innerHeight, CSS media queries and component layout. |
window.screen.width, window.screen.height and available-screen metrics. |
| Playwright configuration | browser.newContext({ viewport }) or page.setViewportSize(). |
browser.newContext({ screen }). |
| Can it be used alone? | Yes. | No. Playwright applies screen only when a viewport is set. |
| Determinism | Fixed values are repeatable across machines. | Fixed values are repeatable when configured at context creation. |
| Mutation caveat | page.setViewportSize() changes the viewport. |
That page-level call also resets the configured screen size. |
What Playwright means by viewport
A Playwright viewport is a width and height in CSS pixels for the page surface. It is the value that normally drives responsive behavior: breakpoint selection, line wrapping, grid columns, navigation collapse and element dimensions. A page with a 1365-pixel viewport should lay out as a 1365-pixel browser content area, regardless of a larger emulated monitor.
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What Playwright means by screen
The screen option supplies the display geometry that page code reads from window.screen. It can represent a physical display larger than the browser content area. For example, a test can model a 1920×1080 display with a browser viewport of 1365×768:
const context = await browser.newContext({
viewport: { width: 1365, height: 768 },
screen: { width: 1920, height: 1080 },
});In that example, CSS layout follows 1365×768. Code inspecting window.screen.width sees 1920, and window.screen.height sees 1080. The screen setting does not enlarge the page or force media queries to use the monitor dimensions. Also, screen is only used when a viewport is set; a screen-only context does not provide the intended independent display model.
Which value drives responsive breakpoints?
Use the viewport. CSS media queries and the page’s layout calculations are based on the available browser content area, not the value returned by window.screen. A test such as this checks the behavior that users see:
import { test, expect } from '@playwright/test';
test('navigation collapses at the mobile breakpoint', async ({ browser }) => {
const context = await browser.newContext({
viewport: { width: 390, height: 844 },
});
const page = await context.newPage();
await page.goto('https://example.com');
await expect(page.locator('[data-testid="mobile-menu"]')).toBeVisible();
await context.close();
});Do not replace the viewport assertion with window.screen.width. A large emulated screen can coexist with a narrow viewport, and the page should still render its narrow layout.
When should you configure both?
Ordinary responsive-layout tests
Set only a fixed viewport when the test covers CSS breakpoints, component arrangement, screenshots or visual regression:
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const context = await browser.newContext({
viewport: { width: 1365, height: 768 },
});This is the simplest and most portable configuration. Avoid viewport: null in CI unless the purpose of the test is specifically headed, host-window behavior.
Applications that read screen metrics
Set both values when application code branches on window.screen, calculates display availability, or when you need to model a browser window inside a larger monitor:
const context = await browser.newContext({
viewport: { width: 1365, height: 768 },
screen: { width: 1920, height: 1080 },
});
const page = await context.newPage();
await page.goto('https://example.com');
const geometry = await page.evaluate(() => ({
innerWidth: window.innerWidth,
innerHeight: window.innerHeight,
screenWidth: window.screen.width,
screenHeight: window.screen.height,
}));
console.log(geometry);Expect the inner dimensions to reflect the viewport and the screen dimensions to reflect the screen setting. Browser chrome, operating-system taskbars and device-pixel scaling are separate concerns; do not infer them from these four values.
Device presets: a coordinated bundle
Playwright device descriptors can provide a viewport, user agent, touch capability and related device properties together. Use a preset when you are testing a known device profile, then override the viewport if the content area must differ:
import { chromium, devices } from 'playwright';
const browser = await chromium.launch();
const context = await browser.newContext({
...devices['Desktop Chrome'],
viewport: { width: 1440, height: 900 },
});
const page = await context.newPage();
await page.goto('https://example.com');
await browser.close();A preset’s screen and viewport properties are still distinct. Do not treat a supplied screen size as a replacement for the viewport used by layout.
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Changing dimensions after page creation
page.setViewportSize() resizes the page after a context or page exists:
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await page.setViewportSize({ width: 1024, height: 768 });Set the size before navigation whenever possible. Sites often select a layout, load a menu variant or calculate image sizes during initial load. Resizing afterward may leave application state that was initialized for the old dimensions.
There is an important side effect: Playwright documents that page.setViewportSize() resets the screen size. If your scenario needs independent viewport and screen values, configure both on browser.newContext() and create a new context for each combination instead of mutating the page-level viewport.
Common mistakes and fixes
Setting screen and expecting a larger layout
Symptom: window.screen.width is 1920, but the site still shows the 1365-pixel layout. Cause: layout follows viewport. Fix: change viewport.width and leave screen as the independent display value.
Using screen.width for breakpoint assertions
Symptom: a test passes on one configuration but fails when the browser window changes. Cause: the assertion reads display geometry rather than page content width. Fix: assert visible UI, computed styles, window.innerWidth or the intended CSS behavior.
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Changing viewport and losing screen
Symptom: a previously configured screen value returns to a default-like value after resizing. Cause: setViewportSize() resets screen size. Fix: configure both at context creation and avoid the page-level mutation for that test.
Non-repeatable CI dimensions
Symptom: parallel workers choose different breakpoints. Cause: viewport: null uses each host window. Fix: use explicit width and height for every context, especially in CI.
Screen option appears to do nothing
Symptom: page code does not observe the configured screen dimensions. Cause: screen emulation is only applied when a viewport is set. Fix: provide both viewport and screen in newContext().
Choosing a configuration
- Testing CSS responsiveness: fixed viewport only.
- Testing code that reads display geometry: fixed viewport plus explicit screen.
- Testing a known phone or tablet profile: device descriptor, with a viewport override only when required.
- Testing host-window integration:
viewport: null, isolated from deterministic CI tests and documented as host-dependent. - Testing several sizes: create separate contexts or projects so each run starts with known values.
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Cost, performance and reliability considerations
Viewport and screen values themselves do not add a separate Playwright charge; they are emulation settings. The practical cost is the browser work required by each test. Reusing a browser process while creating isolated contexts usually gives cleaner test boundaries than repeatedly launching browsers. Keep dimensions fixed so screenshots and assertions can be compared across workers. When a page changes layout after navigation, investigate application resize handlers and late-loading fonts or images rather than assuming screen and viewport are interchangeable.
Frequently Asked Questions
Does setting viewport change window.screen?
Not when configured independently at context creation. However, Playwright documents that page.setViewportSize() changes the viewport and resets screen size.
Can I set screen without setting viewport?
No. Playwright applies the screen option only when a viewport is set.
Why are innerWidth and screen.width different?
They represent different layers: innerWidth is the page viewport, while screen.width is the emulated display geometry.
What should I use for a visual screenshot test?
Use a fixed viewport that matches the intended browser content area. Add screen only if page code explicitly depends on screen metrics.
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