Web Accessibility Academy · 课时

CSS 和 JS 中的 prefers-reduced-motion

检测并尊重用户的动态效果设置。

CSS 和 JS 中的 prefers-reduced-motion 是 CoddyKit 上的免费 Web Accessibility Academy 课时。这是第 1 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Web Accessibility Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Web Accessibility Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

A Setting You Can Read

Operating systems let people ask for less motion. The prefers-reduced-motion media feature exposes that choice straight to your site. 🎚️

Where Users Turn It On

People flip reduce motion in OS settings on macOS, iOS, Windows, and Android. Your job is to listen, not to second-guess the choice.

Two Values

The feature reports one of two states. It is either reduce, meaning calm the animations down, or no-preference for everyone else.

Query It in CSS

Wrap calming styles in a media query. When a user asks to reduce motion, you can cut transitions to almost nothing.

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; }
}

Reduce, Do Not Always Remove

Calming motion does not mean a frozen page. Swap a big slide for a gentle fade so the interface still feels alive but never lurches.

Design Motion-On First

Build your normal animated styles, then add the query to scale them back. This progressive approach keeps the default experience rich.

Read It in JavaScript

For scripted animations, ask the browser directly. matchMedia returns whether the user prefers reduced motion right now.

const mq = window.matchMedia('(prefers-reduced-motion: reduce)');
if (mq.matches) { /* skip the big animation */ }

React to Live Changes

People can toggle the setting mid-session. Listen for changes so your JavaScript animations respect the new preference without a reload.

mq.addEventListener('change', e => updateMotion(e.matches));

Cover Scroll Behavior

Smooth scrolling counts as motion too. Inside the query, set scroll-behavior to auto so jumps are instant for those who asked.

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

It Is a Real Need

This is not a nice-to-have toggle. For some users, big motion causes real nausea or dizziness, so honoring the request matters.

Default Off Is Safest

When unsure, treat the safest path as the default. Leaning toward calm motion harms nobody and keeps the page comfortable for all.

Quick Check

How does a website learn that a user wants less motion?

Recap

Read prefers-reduced-motion in CSS or with matchMedia, then calm animations instead of killing the page. Honor live toggles too. ✅

常见问题解答

「CSS 和 JS 中的 prefers-reduced-motion」课时是免费的吗？

是的 — 「CSS 和 JS 中的 prefers-reduced-motion」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Web Accessibility Academy 课程的其余内容，请升级到 CoddyKit PRO。 Web Accessibility Academy 课程共包含 4 节课。

「CSS 和 JS 中的 prefers-reduced-motion」这节课中我会学到什么？

检测并尊重用户的动态效果设置。你通过在浏览器中直接运行的动手代码来练习 Web Accessibility Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Web Accessibility Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Web Accessibility Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 1 节课，共 4 节。

「CSS 和 JS 中的 prefers-reduced-motion」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Web Accessibility Academy 课中编写并运行代码吗？

能。每节 Web Accessibility Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

← 返回 Web Accessibility Academy