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puppeteer/docs/api/puppeteer.page.emulatemediafeatures.md
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chore(deps-dev): Bump the dev-dependencies group with 3 updates (#12101) 
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Co-authored-by: Nikolay Vitkov <nvitkov@chromium.org>
2024-03-20 15:03:14 +00:00

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sidebar_label
Page.emulateMediaFeatures

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