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CSS Properties

align-content align-items align-self all animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-repeat background-size border border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-shadow box-sizing caption-side clear clip color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset cursor direction display empty-cells filter flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-size font-size-adjust font-stretch font-style font-variant font-weight hanging-punctuation height justify-content @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top max-height max-width @media min-height min-width nav-down nav-index nav-left nav-right nav-up opacity order outline outline-color outline-offset outline-style outline-width overflow overflow-x overflow-y padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside perspective perspective-origin position quotes resize right tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-indent text-justify text-overflow text-shadow text-transform top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-bidi vertical-align visibility white-space width word-break word-spacing word-wrap z-index



CSS3 opacity Property


Example

Set the opacity level for a <div> element:

div {
    opacity: 0.5;
}
Try it Yourself »

More "Try it Yourself" examples below.


Definition and Usage

The opacity 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 the opacity 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 about animatable Try 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

Note: IE8 and earlier versions supports an alternative, the filter property. Like: filter:Alpha(opacity=50).


CSS Syntax

opacity: number|initial|inherit;

Property Values

Value Description Play it
number Specifies the opacity. From 0.0 (fully transparent) to 1.0 (fully opaque) Play it »
initial Sets this property to its default value. Read about initial Play it »
inherit Inherits this property from its parent element. Read about inherit

More Examples

Example

When using the opacity 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:

opacity 1

opacity 0.6

opacity 0.3

opacity 0.1

Try it Yourself »

Example

If you do not want to apply opacity to child elements, like in our example above, use RGBA color values. The following will set the opacity for the background color and not the text:

100% opacity

60% opacity

30% opacity

10% opacity

Try it Yourself »

Tip: Learn more about RGBA Colors in CSS3 RGBA Colors.

Example

How to use JavaScript to change the opacity for an element:

function myFunction(x) {
// 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!");
    }
}
Try it Yourself »

Related Pages

CSS Tutorial: CSS Opacity / Transparency

CSS Tutorial: CSS3 RGBA Colors

HTML DOM Reference: opacity property