HTML and CSS Reference
In-Depth Information
Frequencies
A frequency value (
<frequency>
) is expressed as a non-negative
<number>
followed imme-
diately by a frequency unit. There are two types of frequency units: hertz (
Hz
) and kilohertz
(
kHz
). The unit identifiers are case-insensitive, so
6kHz
and
6khz
are equivalent. As of this
writing, frequency values are only used with aural styles, which are not well supported.
