chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/filters-opacity-001-test.html

<!DOCTYPE html>
<html>
<head>
    <title>CSS Filter Test: Test opacity shorthand with value 1</title>
    <link rel="author" title="Naohiro Nakajima" href="mailto:[email protected]">
    <link rel="reviewer" title="Dirk Schulze" href="mailto:[email protected]">
    <link rel="help" href="http://www.w3.org/TR/filter-effects-1/#FilterProperty">
    <link rel="help" href="https://www.w3.org/TR/filter-effects-1/#funcdef-filter-opacity">
    <link rel="match" href="reference/filters-opacity-001-ref.html">
    <meta name="assert" content="CSS opacity filter will apply a transparency to the div element.
    Since opacity is 1, it has no affect on the div.">
    <style type="text/css">

        div {
            width: 200px;
            height: 200px;
            background: green;
            filter: opacity(1);
        }

    </style>
</head>
<body>
<p>Test opacity CSS shorthand.You should see a green box.</p>
<!-- PAGE CONTENT -->
<div></div>

</body>
</html>