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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Use Puppeteer’s page.addStyleTag() to inject CSS into a page you have already opened. Pass CSS as content for an inline style, or a stylesheet address as url. Await the call before taking a screenshot or relying on the styles.
Inject inline CSS into the current page
After navigating to the target page, call page.addStyleTag() with a content string. Puppeteer inserts a style element into the page’s main frame and returns a handle for that element. The API reference is for Puppeteer 25.12.0: Page.addStyleTag().
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const { launch } = require('puppeteer');
(async () => {
const browser = await launch();
try {
const page = await browser.newPage();
await page.goto('https://example.com');
await page.addStyleTag({
content: 'body { background: papayawhip; }',
});
await page.screenshot({ path: 'page.png' });
} finally {
await browser.close();
}
})();The key sequence is navigation, awaited style injection, then the operation that needs the CSS. Replace the example rule and URL with your own.
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For a stylesheet hosted separately, provide its URL instead of content:
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await page.addStyleTag({ url: 'https://example.com/custom.css' });This adds a stylesheet link to the main frame. Puppeteer documents the two forms as inserting either a <style type="text/css"> element containing CSS or a <link rel="stylesheet"> element for the URL.
Apply CSS inside a child frame
The page-level method targets the main frame. If the element you need to style is inside an iframe, call the corresponding method on that frame rather than assuming the page-level injection will affect it.
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const frame = page.frames().find((candidate) => candidate.url().includes('widget'));
if (!frame) throw new Error('Target frame not found');
await frame.addStyleTag({
content: '.target { display: none; }',
});Adjust the frame selection to match your page. Puppeteer’s Frame.addStyleTag() API provides style injection for a particular frame; the retrieved reference identifies version 25.10.0.
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Choose the right Puppeteer API
| Task | Use | What it does |
|---|---|---|
| Add CSS to an existing page | page.addStyleTag({ content: css }) |
Inserts inline CSS into the main frame. |
| Load a hosted stylesheet | page.addStyleTag({ url: cssUrl }) |
Inserts a stylesheet link into the main frame. |
| Style a child frame | frame.addStyleTag(...) |
Injects CSS into that frame. |
| Run broader DOM logic | page.evaluate(fn) |
Runs a function in the browser page context; Puppeteer awaits a promise returned by the function. |
| Supply document markup | page.setContent(html) |
Sets the page’s HTML rather than injecting CSS into an already loaded document. |
The official references for the alternatives are Page.evaluate() and Page.setContent() (Puppeteer 25.12.0).
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Common problems and checks
- The screenshot has no injected styles: confirm the
addStyleTag()call is awaited and runs after navigation but before the screenshot or other dependent action. - The target element is in an iframe: locate its frame and use
frame.addStyleTag(); page-level injection is documented as a shortcut for the main frame. - The external stylesheet does not appear to apply: check the URL and whether the page’s navigation sequence or site-specific policy affects loading. The API reference documents insertion of a link, but cannot guarantee how every target site handles it.
- You are replacing the page rather than styling it: use
page.setContent(html)when the task is to assign document markup. It serves a different purpose from adding a stylesheet to an existing document.
Or skip the browser setup
If you only need a screenshot rather than a Puppeteer-controlled browser page, ScreenshotNeo accepts a URL in one GET request. Its API supports custom CSS and JavaScript; its CSS and JavaScript options can be used to adapt the rendered capture. See the API documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo removes known cookie and consent banners, newsletter popups, and chat widgets before capture, with each cleanup step configurable. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and responses identify the page verdict and billing status in headers. An MCP server provides screenshot tools for AI agents, and the free plan includes 1,000 screenshots per month without a card; paid plans start at $5 for 3,000 screenshots.
Create a free ScreenshotNeo account to get 1,000 screenshots a month with no card.
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