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First identify what “virtual screen” means
Puppeteer has separate controls for Chrome’s screen configuration and for a page viewport. A screen is part of the browser’s display setup; a viewport is the area in which an individual page renders. Removing a screen will not reset a viewport, and resetting a viewport will not remove a screen.
| What you want to change | Use | Scope |
|---|---|---|
| Remove a screen added while headless Chrome is running | browser.removeScreen(screenId) |
Browser screen configuration; dynamic removal is headless-only. |
| Reset a page viewport | page.setViewport(null) |
That page’s viewport. |
| Resize page content dimensions | page.resize({contentWidth, contentHeight}) |
Browser window content dimensions, using Puppeteer’s window-management API. |
Remove a screen added at runtime
Puppeteer’s screen-configuration guide documents Browser.addScreen() and Browser.removeScreen() for adding and removing screens while Chrome is running. Save the returned screen object and pass its id to the removal method.
const added = await browser.addScreen({
left: 800,
top: 0,
width: 800,
height: 600,
label: '2nd',
});
await browser.removeScreen(added.id);If you already have the screen ID, pass it directly:
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await browser.removeScreen(screenId);The official guide’s example returns the screen count from two to one after removing the added screen. The example coordinates and dimensions describe that configuration; use the ID for the screen you actually added rather than deriving an ID from its position or size.
Check the current screens
Use await browser.screens() to inspect the browser’s screen list. The guide documents this inspection method in both headless and headful modes, even though runtime add and remove are headless-only.
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const screens = await browser.screens();
console.log(screens);Mode and launch configuration
The dynamic addScreen() and removeScreen() APIs apply to headless Chrome. If Chrome is headful, the guide describes its screens as physical platform screens; do not expect the headless runtime-removal API to remove one.
The guide also notes that, absent a --screen-info switch, headless Chrome has one default 800×600 screen unless --window-size is specified, in which case the screen is as large as the requested window. That launch-time sizing is distinct from removing a screen added later.
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Reset the page viewport instead
If the issue is that responsive layout or page rendering is constrained by a viewport set earlier in the script, reset it with null:
await page.setViewport(null);Puppeteer’s Page.setViewport() reference says null resets the viewport to its default value. It does not change the browser’s screen list.
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Some viewport changes can reload the page when settings involving isMobile or hasTouch change. If a reset is followed by a reload, check those emulation options as well as the viewport dimensions.
Resize page content dimensions
If your goal is to change the browser window’s content width or height rather than screen topology or page viewport emulation, Puppeteer documents Page.resize(). Its window-management guide clears the default viewport first and waits for the resize event because the inner window size updates asynchronously.
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await page.setViewport(null);
const resized = new Promise(resolve => {
page.once('resize', resolve);
});
await page.resize({ contentWidth: 1200, contentHeight: 800 });
await resized;
const dimensions = await page.evaluate(() => ({
width: window.innerWidth,
height: window.innerHeight,
}));
console.log(dimensions);Use the resize event before reading the new inner dimensions; otherwise, code may observe the previous size while the update is still pending.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot the wrong-size or extra-screen problem
removeScreenis unavailable or does not apply: Confirm that Chrome is running headless. The dynamic screen methods are documented for headless mode only.- The page still renders at the old dimensions: Check whether the changed value is the page viewport, the screen configuration, or the browser content size. Use the corresponding API rather than substituting one for another.
- You do not know the screen ID: Inspect
await browser.screens()and retain the object returned byaddScreen()in future code so its ID is available for removal. - Dimensions appear unchanged immediately after resizing: Wait for the window resize event before reading
window.innerWidthorwindow.innerHeight. - The page reloads after a viewport change: Review changes to
isMobileandhasTouch, which Puppeteer identifies as settings that can trigger a reload in some cases.
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