From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- files/zh-cn/web/css/frequency/index.html | 74 ++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 files/zh-cn/web/css/frequency/index.html (limited to 'files/zh-cn/web/css/frequency/index.html') diff --git a/files/zh-cn/web/css/frequency/index.html b/files/zh-cn/web/css/frequency/index.html new file mode 100644 index 0000000000..f230c49052 --- /dev/null +++ b/files/zh-cn/web/css/frequency/index.html @@ -0,0 +1,74 @@ +--- +title: +slug: Web/CSS/frequency +tags: + - CSS + - Web + - 参考 +translation_of: Web/CSS/frequency +--- +
{{CSSRef}}
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<frequency> CSS数据类型表示频率维度，例如语音的音高。目前它未在任何 CSS 属性中被使用。

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语法

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The <frequency> data type consists of a {{cssxref("<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.

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单位

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可以使用以下单位：

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Hz
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表示以赫兹（hertz）为单位的频率。例如：0Hz、1500Hz、10000Hz。
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kHz
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表示以千赫兹（kilohertz）为单位的频率。例如：0kHz、1.5kHz、10kHz。
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Note: 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.

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示例

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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
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Invalid frequency values

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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>.
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规范

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规范状态备注
{{SpecName('CSS3 Values', '#frequency', '<frequency>')}}{{Spec2('CSS3 Values')}}Initial definition
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Note: 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.

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浏览器兼容性

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{{Compat("css.types.frequency")}}

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