CSS font-weight Property

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CSS font-weight Property

CSS font-weight property sets the weight (or boldness) of the font.

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <head> <style> p:nth-child(2){ font-weight: 400; } p:nth-child(3){ font-weight: bold; } </style> </head> <body> <h1>CSS font-weight Property</h1> <p>This is a paragraph with font-weight 400.</p> <p>This is a paragraph with font-weight bold.</p> </body> </html>
Run

Syntax

Using CSS

element{ font-weight: bold; }

Using Javascript

object.style.fontWeight="bold";

Animatable

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

Default Value

Default value for CSS font-weight property is normal.

Property Value

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

ValueExplanation
normalNormal font weight. Same as 400.
boldBold font weight. Same as 700.
lighterFont weight lighter than the parent element.
bolderFont weight heavier than the parent element.
100
200
300
400
500
600
700
800
900
Defines from thin to thick characters.

Using JavaScript

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

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <body> <h1>CSS font-weight Property</h1> <p>This is a paragraph</p> <button onclick="myFunction()">Click Me</button> <script> var x = document.getElementsByTagName("p")[0]; function myFunction(){ x.style.fontWeight = "900"; } </script> </body> </html>
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