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CSS Pocket Reference, 4th Edition by Eric A. Meyer

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Frequencies

A frequency value (<frequency>) is expressed as a non-negative <number> followed immediately 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.

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