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diff --git a/testing/web-platform/tests/css/css-contain/contain-paint-change-opacity.html b/testing/web-platform/tests/css/css-contain/contain-paint-change-opacity.html
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+++ b/testing/web-platform/tests/css/css-contain/contain-paint-change-opacity.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="help" href="https://drafts.csswg.org/css-contain-2/#contain-property">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<script src="/common/reftest-wait.js"></script>
+<script src="/common/rendering-utils.js"></script>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="width: 100px; background: red">
+ <div id="container" style="contain: paint; opacity: 0.1">
+ <div style="height: 100px; background: green; position: relative"></div>
+ </div>
+</div>
+<script>
+waitForAtLeastOneFrame().then(() => {
+ container.style.opacity = 1;
+ takeScreenshot();
+});
+</script>
+</html>