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Chapter 6. CSS Units > Frequency Units

6.7. Frequency Units

With the advent of the Aural Cascading Style Sheets (ACCS) specification came the introduction of units of value for sound frequencies. There are two such units of frequency that can be specified in selected ACSS properties: Hz (Hertz) and kHz (kilohertz). For the most part, when specifying frequency values, use Hz for relatively low sounds (like a human voice) and kHz for higher sounds (like high-pitched tones). These values cannot be expressed in negative values and this is obvious when you think about it — if a 0 value is silence, what could be less than that? Also, it is worth noting that these values are not case sensitive — hz, khz, HZ, KHz are all equivalent

The following code snippet shows how the Hertz frequency unit might be put to use:


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