Page.emulateMediaFeatures() method

Signature

class Page {
  abstract emulateMediaFeatures(features?: MediaFeature[]): Promise<void>;
}

Parameters

Parameter	Type	Description
features	MediaFeature[]	(Optional) <?Array<Object>> Given an array of media feature objects, emulates CSS media features on the page. Each media feature object must have the following properties:

Returns:

Promise<void>

Example

await page.emulateMediaFeatures([
  {name: 'prefers-color-scheme', value: 'dark'},
]);
await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches);
// → true
await page.evaluate(() => matchMedia('(prefers-color-scheme: light)').matches);
// → false

await page.emulateMediaFeatures([
  {name: 'prefers-reduced-motion', value: 'reduce'},
]);
await page.evaluate(
  () => matchMedia('(prefers-reduced-motion: reduce)').matches,
);
// → true
await page.evaluate(
  () => matchMedia('(prefers-reduced-motion: no-preference)').matches,
);
// → false

await page.emulateMediaFeatures([
  {name: 'prefers-color-scheme', value: 'dark'},
  {name: 'prefers-reduced-motion', value: 'reduce'},
]);
await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches);
// → true
await page.evaluate(() => matchMedia('(prefers-color-scheme: light)').matches);
// → false
await page.evaluate(
  () => matchMedia('(prefers-reduced-motion: reduce)').matches,
);
// → true
await page.evaluate(
  () => matchMedia('(prefers-reduced-motion: no-preference)').matches,
);
// → false

await page.emulateMediaFeatures([{name: 'color-gamut', value: 'p3'}]);
await page.evaluate(() => matchMedia('(color-gamut: srgb)').matches);
// → true
await page.evaluate(() => matchMedia('(color-gamut: p3)').matches);
// → true
await page.evaluate(() => matchMedia('(color-gamut: rec2020)').matches);
// → false

await page.emulateMediaFeatures([{name: 'prefers-contrast', value: 'more'}]);
await page.evaluate(() => matchMedia('(prefers-contrast: more)').matches);
// → true

await page.emulateMediaFeatures([{name: 'forced-colors', value: 'active'}]);
await page.evaluate(() => matchMedia('(forced-colors: active)').matches);
// → true

await page.emulateMediaFeatures([
  {name: 'prefers-reduced-transparency', value: 'reduce'},
]);
await page.evaluate(() => {
  return matchMedia('(prefers-reduced-transparency: reduce)').matches;
});
// → true