CSSopacity Property
More "Try it Yourself" examples below.
Definition and Usage
Theopacity property sets the opacity level for an element.
The opacity-level describes the transparency-level, where 1 is not transparent at all, 0.5 is 50% see-through, and 0 is completely transparent.
opacity 0.2
opacity 0.5
opacity 1
(default)
Note: When using theopacity property to add transparency to the background of an element, all of its child elements become transparent as well. This can make the text inside a fully transparent element hard to read. If you do not want to apply opacity to child elements, use RGBA color values instead (See "More Examples" below).
| Default value: | 1 |
|---|---|
| Inherited: | no |
| Animatable: | yes,see individual properties.Read aboutanimatableTry it |
| Version: | CSS3 |
| JavaScript syntax: | object.style.opacity="0.5"Try it |
Browser Support
The numbers in the table specify the first browser version that fully supports the property.
| Property | |||||
|---|---|---|---|---|---|
| opacity | 4.0 | 9.0 | 2.0 | 3.1 | 9.0 |
CSS Syntax
Property Values
| Value | Description | Demo |
|---|---|---|
| number | Specifies the opacity. From 0.0 (fully transparent) to 1.0 (fully opaque) | Demo ❯ |
| initial | Sets this property to its default value.Read aboutinitial | |
| inherit | Inherits this property from its parent element.Read aboutinherit |
More Examples
Example
The opacity property adds transparency to the background of an element, and to all of its child elements as well. This makes the text inside a transparent element hard to read:
opacity: 0.1;
}
div.second {
opacity: 0.3;
}
div.third {
opacity: 0.6;
}
Example
To not apply opacity to child elements (like in the example above) useRGBA color values instead. The following example sets the opacity for the background color, but not for the text:
background: rgba(76, 175, 80, 0.1);
}
div.second {
background: rgba(76, 175, 80, 0.3);
}
div.third {
background: rgba(76, 175, 80, 0.6);
}
Tip: Learn more about RGBA Colors inCSS RGBA Colors.
Example
How to use JavaScript to change the opacity for an element:
// Return the text of the selected option
var opacity = x.options[x.selectedIndex].text;
var el = document.getElementById("p1");
if (el.style.opacity !== undefined) {
el.style.opacity = opacity;
} else {
alert("Your browser doesn't support this example!");
}
}
Related Pages
CSS Tutorial:CSS Opacity / Transparency
CSS Tutorial:CSS RGBA Colors
HTML DOM Reference:opacity property
