CSS volume

The CSS volume property is used for specifying the median volume of the wave form.

Syntax

number: Any number between 0 and 100. 0 represents the minimum audible volume level and 100 corresponds to the maximum comfortable level.
percentage: Percentage values are calculated relative to the inherited value,and are then clipped to the range 0 to 100.
silent: No sound at all. The value 0 does not mean the same as silent.
x-soft: Same as 0.
soft: Same as 25.
medium: Same as 50.
loud: Same as 75.
x-loud: Same as 100.

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

initial: Represents the value specified as the property's initial value.
inherit: Represents the computed value of the property on the element's parent.
unset: This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.