CSS font-weight Property

February 10, 2021 12:37 pm IST

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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>

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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.

Value	Explanation
normal	Normal font weight. Same as 400.
bold	Bold font weight. Same as 700.
lighter	Font weight lighter than the parent element.
bolder	Font 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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