Pixel widths and may therefore have to approximate the computed ForĮxample, a user agent may only be able to render borders with integer May not be able to make use of the value in a given environment. This is described in the property definition.Ī computed value is in principle ready to be used, but a user agent In the cases where child elements do not inherit the computed value, Number value for the 'line-height' property). Some properties whose specified value may be inherited (e.g., the In most cases, elements inherit computed values. 'bolder', 'inherit') must be replaced according to their definitions. Units (em, ex, px) must be made absolute by multiplying with theĪppropriate font or pixel size, 'auto' values must be computed by theįormulas given with each property, certain keywords ('smaller', (each property defines which value that is), values with relative Relative values, on the other hand, must be transformed intoĬomputed values: percentages must be multiplied by a reference value For absolute values, no computation is needed to find the They are specified relative to another value, as in 'auto', '2em', and Relative to another value, as in 'red' or '2mm') or relative (i.e., Specified values may be absolute (i.e., they are not specified The parent element in this case, the initial value is used if Since it has no parent, the root of the document tree cannot use values from The initial value of each property is indicated Otherwise use the property's initial value.Otherwise, if the property is inherited, use the value of the parent.On the following mechanisms (in order of precedence): User agents must first assign a specified value to a property based The limitations of the local environment (the "actual value"). (the "computed value"), and finally transformed according to "specified value"), then resolved into an absolute value if necessary The final value of a property is the result of a three-stepĬalculation: the value is determined through specification (the Once a user agent has parsed a document and constructed a document tree, it must assign, forĮvery element in the tree, a value to every property that applies to the 6.4.4 Precedence of non-CSS presentational hints 6.1 Specified, computed, and actual values.6.4.3 Calculating a selector's specificity.
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