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diff --git a/testing/web-platform/tests/css/css-color/parsing/opacity-computed.html b/testing/web-platform/tests/css/css-color/parsing/opacity-computed.html
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+++ b/testing/web-platform/tests/css/css-color/parsing/opacity-computed.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Color Level 3: getComputedStyle().opacity</title>
+<link rel="help" href="https://www.w3.org/TR/css-color-3/#opacity">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("opacity", "1");
+test_computed_value("opacity", "0.5");
+test_computed_value("opacity", "0");
+test_computed_value("opacity", "-2", "0");
+test_computed_value("opacity", "3", "1");
+test_computed_value("opacity", "-100%", "0");
+test_computed_value("opacity", "50%", "0.5");
+test_computed_value("opacity", "300%", "1");
+
+</script>
+</body>
+</html>