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1.0.5 • Public • Published


Detects user’s preferences for reduced motion using the prefers-reduce-motion CSS3 level 5 media query.

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✨ Introduction

Quoting from the CSS3 level 5 media queries specfication…

The prefers-reduced-motion media feature is used to detect if the user has requested the system to minimize the amount of animation or motion it uses.

🎢 prefersReducedMotion() is part of 🔮 Magica11y, which provides a suite of functions to detect “user-preference” and “environment” media features.

Magica11y functions are awesome because…

  • They have zero dependencies
  • They’re lightweight; e.g. prefersReducedMotion() is just Bundlephobia minified, or Bundlephobia minified & gzipp’d
  • They use the window.matchMedia API underneath
  • They’re optimized for performance; all the module functions are designed in such a way that they exit early
  • They provide a clean, well-documented and semantic API to work with

In addition to prefersReducedMotion(), Magica11y also provides…

🚀 Getting started

🏗 Installation

You can install prefersReducedMotion() using a package manager such as yarn or npm

$ yarn add "@magica11y/prefers-reduced-motion"
# OR 
$ npm install --save "@magica11y/prefers-reduced-motion"

You can also include prefersReducedMotion() from a CDN on your page, such as jsDelivr or unpkg

<script src="https://cdn.jsdelivr.net/npm/@magica11y/prefers-reduced-motion@latest/dist/magica11y.prefersReducedMotion.min.js"></script>
<!-- OR -->
<script src="https://unpkg.com/@magica11y/prefers-reduced-motion@latest/dist/magica11y.prefersReducedMotion.js"></script>

🎲 Usage

prefersReducedMotion() is distributed as a UMD module, so you can use it as a browser global…

var motionPreference = window.magica11y.prefersReducedMotion.default();
var disableAnimations = (motionPreference === window.magica11y.prefersReducedMotion.motionPreferences.REDUCE);

… or as a CommonJS module…

const prefersReducedMotion = require('@magica11y/prefers-reduced-motion');
const motionPreference = prefersReducedMotion.default();
const disableAnimations = (motionPreference === prefersReducedMotion.motionPreferences.REDUCE);

… or as an ES module…

import prefersReducedMotion, { motionPreferences } from '@magica11y/prefers-reduced-motion';
const motionPreference = prefersReducedMotion();
const disableAnimations = (motionPreference === motionPreferences.REDUCE);

The motionPreferences object contains all the possible values supported by the 'prefers-reduce-motion' media query…

  • motionPreferences.NO_PREFERENCE (spec: 'no-preference')

    Indicates that the user has made no preference known to the system.

  • motionPreferences.REDUCE (spec: 'reduce')

    Indicates that user has notified the system that they prefer an interface that minimizes the amount of movement or animation, preferably to the point where all non-essential movement is removed.

  • null

    The user’s preference could not be determined.

🏁 Typechecking

You can import the Flow types from the provided libdefs in node_modules/@magica11y/prefers-reduced-motion/lib by configuring them in your .flowconfig


Now, you can use the Flow types as follows…

// @flow
import prefersReducedMotion, { type MotionPreference } from '@magica11y/prefers-reduced-motion';
const motionPreference: ?MotionPreference = prefersReducedMotion();

🎩 Note: prefersReducedMotion() returns a nullable type (i.e. MotionPreference). So using the ? prefix to indicate nullable types is recommended (i.e. ?MotionPreference).

📚 Further reading

📜 License


See LICENSE.md for more details.

Handcrafted with ❤️ by Rishabh Rao.



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