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diff --git a/testing/web-platform/tests/css/css-contain/container-queries/style-change-in-container.html b/testing/web-platform/tests/css/css-contain/container-queries/style-change-in-container.html
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+<!doctype html>
+<title>CSS Container Queries Test: recompute style inside a @container</title>
+<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-queries">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/cq-testcommon.js"></script>
+<style>
+  #container { container-type: size; }
+  @container (min-width: 1px) {
+    #content { color: green; }
+  }
+</style>
+<div id="container">
+  <div id="content"></div>
+</div>
+<script>
+  setup(() => assert_implements_container_queries());
+
+  let content = document.getElementById("content");
+
+  test(() => {
+    assert_equals(getComputedStyle(content).color, "rgb(0, 128, 0)");
+
+    // Dirty style of an element inside the container:
+    content.style.backgroundColor = "lime";
+
+    // The container query should still evaluate correctly:
+    assert_equals(getComputedStyle(content).color, 'rgb(0, 128, 0)');
+  }, "Basic test for container query evaluation stability");
+</script>