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prefers-reduced-data - CSS: Cascading Style Sheets 编辑

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Draft

This page is not complete.

Note: This feature is not supported by any user agent and its specifics are subject to change.

The prefers-reduced-data CSS media feature is used to detect if the user has requested the web content that consumes less internet traffic.

Syntax

no-preference: Indicates that the user has made no preference known to the system. This keyword value evaluates as false in the boolean context.
reduce: Indicates that user has expressed the preference for lightweight alternate content.

Currently no user agent implements this feature, although various operating systems do support such preferences and if this media query is ever implemented user agents will likely rely on the settings provided by the operating system.

Examples

Note: No browser currently implements this feature so the following example will not work.

In this example the montserrat-regular.woff2 font file will neither be preloaded nor downloaded if the user prefers reduced data, in this case the "system font stack" will serve as the fallback font:

HTML

<head>
  <link rel="preload" href="fonts/montserrat-regular.woff2" as="font" media="(prefers-reduced-data: no-preference)" crossorigin>
  <link rel="stylesheet" href="style.css">
</head>

CSS

@media (prefers-reduced-data: no-preference) {
    @font-face {
        font-family: Montserrat;
        font-style: normal;
        font-weight: 400;
        font-display: swap;
        /* latin */
        src: local('Montserrat Regular'), local('Montserrat-Regular'), url('fonts/montserrat-regular.woff2') format('woff2');
        unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
    }
}

body {
  font-family: Montserrat, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Microsoft YaHei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

Result

Specifications

Specification	Status	Comment
Media Queries Level 5 The definition of 'reduced-data' in that specification.	Editor's Draft	Initial definition.

Browser compatibility

BCD tables only load in the browser

prefers-reduced-data - CSS: Cascading Style Sheets 编辑

Experimental

Draft

Syntax

User preferences

Examples

HTML

CSS

Result

Specifications

Browser compatibility

See also

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友情链接

prefers-reduced-data - CSS: Cascading Style Sheets 编辑

Experimental

Draft

如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

词条统计

友情链接

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。