<frequency>

<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。

语法

The <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.

单位

可以使用以下单位:

Hz

表示以赫兹(hertz)为单位的频率。例如:0Hz1500Hz10000Hz

kHz

表示以千赫兹(kilohertz)为单位的频率。例如:0kHz1.5kHz10kHz

备注: 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.

示例

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

Specification
CSS Values and Units Module Level 4
# frequency

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