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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.
Theory is great, but we recommend digging deeper!
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
1+
Edge
12+
Firefox
1+
IE
5.5+
Opera
7+
Safari
1+
Mobile browser support
Chrome
18+
Firefox
4+
Opera
10.1+
Safari
1+