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CSS font-size Property

The font-size property specifies the size of the font. Setting this property may change the size of other items, too, since it is used to compute the value of em, ex, and various other relative length units.

CSS Demo: font-size

font-size: 18px;
font-size: 14px;
font-size: 1.3em;
font-size: 80%;
font-size: x-small;

Technical Details

Default value medium
Applies to all elements
Inherited yes
Computed value as specified
Animatable yes See animatable properties. Demo
Version CSS1
JavaScript syntax object.style.fontSize = "32px" Demo


CSS Syntax:

font-size: medium|xx-small|x-small|small|large|x-large|xx-large|smaller|larger|length|initial|inherit;

Examples

The following example shows how to use font-size property:

Run code

Browser compatibility

The numbers in the table specify the first browser version that fully supports the font-size property:

Property
font-size 1 1 3.5 1 3

Property Values

The following table describes the values of font-size property:

Value Description
medium Sets the font-size to a medium size (This is default)
xx-small Sets the font-size to an xx-small size
x-small Sets the font-size to an x-small size
small Sets the font-size to a small size
large Sets the font-size to a large size
x-large Sets the font-size to an x-large size
xx-large Sets the font-size to an xx-large size
smaller Sets the font-size to a smaller size than the parent element
larger Sets the font-size to a larger size than the parent element
length Defines the size of the font See length units
percentage Sets the font size to a percent of the parent element's font size
initial Sets this property to its default value
inherit Inherits this property from its parent element

See also

CSS Fonts tutorial

CSS font-family property

CSS font-weight property

CSS font-style property

CSS line-height property