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CSS font-size-adjust Property

The font-size-adjust property specifies that the font size should be chosen based on the height of lowercase letters rather than the height of capital letters.

When the first-choice of a font-family is unavailable font fallback occurs, that may results in bigger or smaller font size. The font-size-adjust property is a way to preserve the readability of text in such situation. It does this by adjusting the font-size so that the x-height is the same regardless of the font used.

CSS Syntax:

font-size-adjust: number|none|initial|inherit;


The example below demonstrates how to use font-size-adjust property:

Run code

Browser compatibility

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

font-size-adjust not supported 3 not supported not supported not supported

Property Values

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

Value Description
none Choose the size of the font based only on the font-size property (This is default)
number Specifies the aspect value used to calculate the adjusted font size
initial Sets this property to its default value
inherit Inherits this property from its parent element

Technical Details

Default value "none"
Applies to all elements
Inherited yes
Computed value as specified
Animatable yes See animatable properties.
Version CSS3
JavaScript syntax object.style.fontSizeAdjust = "0.58"

See also

CSS Fonts tutorial

CSS font-weight property

CSS font-style property

CSS font-size property

CSS font-family property

CSS line-height property