CSS Property: opacity
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The CSS (CSS3) opacity property sets the degree of
opacity (transparency) of an element. 0 is completely transparent, 1 is
completely non-transparent. Note also sets the transparency of all relevant
child elements (if you don’t want this to happen then use RGBA colouring).
Valid property values
(other than inherit
and initial) are:
|
Value
|
Description
|
|
number
|
From 0.0 to 1.0
|
|
Default Value:
|
1
|
|
JavaScript syntax:
|
e.g. object.style.opacity="0.6"
|
|
Inherited:
|
No
|
|
Animatable:
|
Yes
|
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head>
<style>
td {width: 300px; height: 40px; background-color: blue; text-align: center;}
p {width: 250px; height: 35px; background-color: yellow;}
p.x1 {opacity: 0.5;}
</style>
</head>
<body>
<table>
<tr><td><p>Element with default property</p></td></tr>
<tr><td><p class="x1">Property set using in-file HTML style</p></td></tr>
<tr><td><p id="x2">Property set using JavaScript</p></td></tr>
</table>
<script>
document.getElementById("x2").style.opacity = "0.5";
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedCSSPropertyOpacity() {
var x = document.createElement("DIV"); x.style.opacity = "0.5"; return (window.getComputedStyle(x, null).opacity == "0.5");
} |
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