puppeteer/docs/api/puppeteer.page.emulatemediatype.md

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Page.emulateMediaType

Page.emulateMediaType() method

Signature:

class Page {
  emulateMediaType(type?: string): Promise<void>;
}

Parameters

Parameter	Type	Description
type	string	(Optional) Changes the CSS media type of the page. The only allowed values are screen, print and null. Passing null disables CSS media emulation.

Returns:

Promise<void>

Example

await page.evaluate(() => matchMedia('screen').matches);
// → true
await page.evaluate(() => matchMedia('print').matches);
// → false

await page.emulateMediaType('print');
await page.evaluate(() => matchMedia('screen').matches);
// → false
await page.evaluate(() => matchMedia('print').matches);
// → true

await page.emulateMediaType(null);
await page.evaluate(() => matchMedia('screen').matches);
// → true
await page.evaluate(() => matchMedia('print').matches);
// → false