CSS opacity Property

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CSS opacity Property

CSS opacity property sets the opacity of an element.

The opacity describes the transparency-level, where 1 is not transparent at all, and 0 is completely transparent.


HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <head> <style> p{ opacity: 0.5; } </style> </head> <body> <h1>CSS opacity Property</h1> <p>This is a paragraph.</p> </body> </html>


Using CSS

element{ opacity: 0.5; }

Using Javascript



Yes, opacity property is animatable. CSS Animatable Properties Reference.

Default Value

Default value for CSS opacity property is 1.

Property Value

The following table provides a list of values for CSS opacity property.

NumberA number in the range 0.0 (fully transparent) to 1.0 (fully opaque), both are inclusive.

Using JavaScript

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


HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <body> <h1>CSS opacity 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.opacity = "0.5"; } </script> </body> </html>


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