The format of a percentage value is an optional sign character ('+' or '-', with '+' being the default) immediately followed by a number (with or without a decimal point) immediately followed by '%'.
Percentage values are always relative to another value, for example a length unit. Each property that allows percentage units also defines what value the percentage value refer to. Most often this is the font size of the element itself:
For example :
P { line-height: 120% } | 120% of the element's 'font-size' |
In all inherited CSS1 properties, if the value is specified as a percentage, child elements inherit the resultant value, not the percentage value.
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