<frequency>
The <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.
Syntax
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.
Units
Hz
-
Represents a frequency in hertz. Examples:
0Hz
,1500Hz
,10000Hz
. kHz
-
Represents a frequency in kilohertz. Examples:
0kHz
,1.5kHz
,10kHz
.
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.
Examples
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>.
Specifications
Specification |
---|
CSS Values and Units Module Level 4 # frequency |
Browser compatibility
BCD tables only load in the browser