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• 句法
• 范例
• 规范
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• 相关话题

<frequency> CSS data type represents a frequency dimension, such as the pitch of a speaking voice. It is not currently used in any CSS properties.

句法

<frequency> data type consists of a <number> followed by one of the units listed below. As with all CSS dimensions, there is no space between the unit literal and the number.

Units

Hz

Represents a frequency in hertz. Examples: 0Hz , 1500Hz , 10000Hz .

kHz

Represents a frequency in kilohertz. Examples: 0kHz , 1.5kHz , 10kHz .

注意： Although the number 0 is always the same regardless of unit, the unit may not be omitted. In other words, 0 is invalid and does not represent 0Hz or 0kHz . Though the units are case-insensitive, it is good practice to use a capital "H" for Hz and kHz , as specified in the SI .

范例

Valid frequency values

12Hz     Positive integer
4.3Hz    Non-integer
14KhZ    The unit is case-insensitive, though non-SI capitalization is not recommended.
+0Hz     Zero, with a leading + and a unit
-0kHz    Zero, with a leading - and a unit
					

Invalid frequency values

12.0     This is a <number>, not an <frequency>, because it is missing a unit.
7 Hz     No space is allowed between the number and the unit.
0        Although unitless zero is an allowable <length>, it's an invalid <frequency>.
					

规范

规范	状态	注释
CSS Values and Units Module Level 3 The definition of '<frequency>' in that specification.	候选推荐	初始定义。

注意： This data type was initially introduced in CSS Level 2 for the now-obsolete aural media type , where it was used to define the pitch of the voice. However, the <frequency> data type has been reintroduced in CSS3, though no CSS property is using it at the moment.

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
<frequency>	Chrome 不支持 No	Edge 不支持 No	Firefox 不支持 No	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
Hz unit	Chrome 不支持 No	Edge 不支持 No	Firefox 不支持 No	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
kHz unit	Chrome 不支持 No	Edge 不支持 No	Firefox 不支持 No	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

不支持

不支持

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