Page | /tests/deps.ts | fresh@1.7.1

x/fresh/tests/deps.ts>Page#emulateMediaFeatures

The next-gen web framework.

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clickWhenListenerReady

startFreshServerExpectErrors

method Page.prototype.emulateMediaFeatures

Re-export

import { Page } from "https://deno.land/x/fresh@1.7.1/tests/deps.ts";

emulateMediaFeatures(features?: MediaFeature[]): Promise<void>

Examples

Example 1

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

Parameters

optional

features: MediaFeature[]

<?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>