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The CSS Font-Size-Adjust Property

Reading time 1 min
Published Aug 8, 2017
Updated Oct 15, 2019

Font size adjustment in CSS

The CSS font-size-adjust property lets you control the sizing for lowercase letters:

Example
div {
    font-size: 30px; 
    font-size-adjust: 0.6;
}

Using font-size-adjust in CSS

After specifying the font-size, you can define the size of lowercase letters in relation to it:

font-size-adjust: value;

The default value for CSS font-size-adjust is none, which means the browser uses the default size of lowercase letters in the chosen font.

To define a custom size, enter a unitless number for the value of font-size to be multiplied by. See a few examples of font size adjustment in the table below.

Imagine the font-size-adjust value is 50px:
font-size-adjust: 0.5; The lowercase letters are 25 pixels in height
font-size-adjust: 0.8; The lowercase letters are 40 pixels in height
font-size-adjust: 0; The lowercase letters are 0 pixels in height

Browser support

Browser image
Chrome
43+
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Edge
-
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Firefox
40+
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IE
-
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Opera
30+
Browser image
Safari
-

Mobile browser support

Browser image
Chrome
-
Browser image
Firefox
4+
Browser image
Opera
-
Browser image
Safari
-