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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

<ratio> CSS data type , used for describing aspect ratios in media queries , denotes the proportion between two unitless values.

句法

In Media Queries Level 3, the <ratio> data type consisted of a strictly positive <integer> followed by a forward slash ('/', Unicode U+002F SOLIDUS ) and a second strictly positive <integer> . Spaces before and after the slash are optional. The first number represents the width, while the second represents the height.

In Media Queries Level 4, the <ratio> date type is updated to consist of a strictly positive <number> followed by a forward slash ('/', Unicode U+002F SOLIDUS ) and a second strictly positive <number> . In addition a single <number> as a value is allowable.

范例

Use in a media query

@media screen and (min-aspect-ratio: 16/9) { ... }
					

Common aspect ratios

	Ratio	用法
	4/3	Traditional TV format in the 20 th century.
	16/9	Modern "widescreen" TV format.
	185/100 = 91/50	The most common movie format since the 1960s.
	239/100	"Widescreen," anamorphic movie format.

规范

规范	状态	注释
Media Queries Level 4 The definition of '<ratio>' in that specification.	候选推荐
Media Queries The definition of '<ratio>' in that specification.	推荐	初始定义。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
<ratio>	Chrome 完整支持 3	Edge 完整支持 12	Firefox 完整支持 3.5	IE 完整支持 9	Opera 完整支持 9.5	Safari 完整支持 5	WebView Android 完整支持 ≤37	Chrome Android 完整支持 18	Firefox Android 完整支持 4	Opera Android 完整支持 14	Safari iOS 完整支持 4.2	Samsung Internet Android 完整支持 1.0
Accepts <number> / <number> or single <number> as a value.	Chrome 不支持 No	Edge 不支持 No	Firefox 完整支持 70 Disabled 完整支持 70 Disabled Disabled ). To change preferences in Firefox, visit	IE 不支持 No	Opera 不支持 No	Safari 不支持 No	WebView Android 不支持 No	Chrome Android 不支持 No	Firefox Android 不支持 No	Opera Android 不支持 No	Safari iOS 不支持 No	Samsung Internet Android 不支持 No

图例

完整支持

完整支持

不支持

不支持

用户必须明确启用此特征。

用户必须明确启用此特征。

另请参阅

• aspect-ratio media feature

元数据

• 最后修改： Jun 25, 2020

相关话题

1. CSS
2. CSS 参考
3. CSS Types
4. 特性

   1. <angle-percentage>
   2. <angle>
   3. <basic-shape>
   4. <blend-mode>
   5. <custom-ident>
   6. <dimension>
   7. <frequency-percentage>
   8. <frequency>
   9. <gradient>
   10. <image>
   11. <integer>
   12. <length-percentage>
   13. <length>
   14. <number>
   15. <percentage>
   16. <ratio>
   17. <resolution>
   18. <shape>
   19. <string>
   20. <time-percentage>
   21. <time>
   22. <transform-function>
   23. <url>
   24. color
   25. flex
   26. ident
   27. position