Page.emulateMediaType() method

Signature

class Page {
  abstract 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