Contents
Defining CSS font sizes
The CSS font-size
property allows you to set the default font size in HTML documents or elements:
The default value is medium
, which equals to 16 pixels. Descendants of the element with a CSS font size defined will inherit it unless they have their font size defined individually.
Writing font-size: CSS syntax
To set a CSS font size, follow the syntax example below:
font-size: value;
All the available property values will be defined in the following section.

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Property values
Value | Definition |
---|---|
Keywords | Define the CSS font size as xx-small , x-small , small , medium , large , x-large or xx-large
|
Numeric values | Define the CSS font size in absolute values (e.g., pixels or millimeters) |
Percentages | Define the CSS font size in relation to the font size of the parent container in percentages |
Relative values | Define the CSS font size as larger or smaller in relation to the font size of the parent container |
Browser support

Chrome

Edge

Firefox

IE

Opera

Safari
Mobile browser support

Chrome

Firefox

Opera

Safari
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