CSS font-size Property

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CSS font-size Property

CSS font-size property sets the size of the font.

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <head> <style> #point{ font-size: 14px; } #point1{ font-size: large; } #point2{ font-size: 150%; } </style> </head> <body> <h1>CSS font-size Property</h1> <p id="point">font-size of this paragraph is 14px.</p> <p id="point1">font-size of this paragraph is large.</p> <p id="point2">font-size of this paragraph is 150%.</p> </body> </html>

Syntax

Using CSS

element{ font-size: 25px; }

Using Javascript

object.size.fontSize="25px";

Animatable

Yes, font-size property is animatable. CSS Animatable Properties Reference.

Default Value

Default value for CSS font-size property is medium.

Property Value

The following table provides a list of values for CSS font-size property.

ValueExplanation
xx-small
x-small
small
medium
large
x-large
xx-large
Specifies the absolute-size keywords, based on the user's default font size.
large
smaller
Specifies the relative-size keywords. The font will be larger or smaller relative to the parent element's font size.
lengthAllows you to define the size of the font in any CSS length unit.
%Sets the font-size to a percent of the parent element's font size.

Using JavaScript

In the following example, we will demonstrate how to change the CSS font-size property of an element using JavaScript.

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <body> <h1>CSS font-size Property</h1> <button onclick="myFunction()">Click Me</button> <script> var x = document.getElementsByTagName("h1")[0]; function myFunction(){ x.style.fontSize = "40px"; } </script> </body> </html>

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