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Page.emulateMediaType() method

Signature:

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

Parameters

ParameterTypeDescription
typestring(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